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Analytic reconstruction of heavy-quark two-point functions at O(α_{s}^{3}) (2012)

David Greynat, Pere Masjuan, and Santiago Peris

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-03-14

Description: Author(s): David Greynat, Pere Masjuan, and Santiago Peris Using a method previously developed, based on the Mellin-Barnes transform, we reconstruct the two-point correlators in the vector, axial, scalar, and pseudoscalar channels at O ( α s 3 ) from the Taylor expansion at q 2 =0 , the threshold expansion at q 2 =4 m 2 and the high-energy expansion at q 2 →-∞ , where m i... [Phys. Rev. D 85, 054008] Published Tue Mar 13, 2012

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Determining low-energy constants in partially quenched Wilson chiral perturbation theory (2012)

Maxwell T. Hansen and Stephen R. Sharpe

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-03-14

Description: Author(s): Maxwell T. Hansen and Stephen R. Sharpe In the low energy effective theory describing the partially quenched extension of two light Wilson fermions, three low energy constants (LECs) appear in terms proportional to a 2 ( a being the lattice spacing). We propose methods to separately calculate these LECs, typically called W 6 ′ , W 7 ′ and W 8 ′ . W... [Phys. Rev. D 85, 054504] Published Tue Mar 13, 2012

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Exclusive diffractive production of real photons and vector mesons in a factorized Regge-pole model with nonlinear Pomeron trajectory (2012)

S. Fazio, R. Fiore, L. Jenkovszky, and A. Lavorini

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-03-15

Description: Author(s): S. Fazio, R. Fiore, L. Jenkovszky, and A. Lavorini Exclusive diffractive production of real photons and vector mesons in e p collisions has been studied at HERA in a wide kinematic range. Here we present and discuss a Regge-type model of real photon production (deeply virtual Compton scattering), as well as production of vector mesons treated on the ... [Phys. Rev. D 85, 054009] Published Wed Mar 14, 2012

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D mesons at finite temperature and density in the Polyakov–Nambu–Jona-Lasinio model (2012)

D. Blaschke, P. Costa, and Yu. L. Kalinovsky

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-02-04

Description: Author(s): D. Blaschke, P. Costa, and Yu. L. Kalinovsky We study D meson resonances in hot, dense quark matter within the Nambu–Jona-Lasinio model and its Polyakov-loop extension. We show that the mass splitting between D + and D - mesons is moderate, not in excess of 100 MeV. When the decay channel into quasifree quarks opens (Mott effect) at densities ab... [Phys. Rev. D 85, 034005] Published Fri Feb 03, 2012

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Form factors for semileptonic, nonleptonic, and rare B(B_{s}) meson decays (2012)

Mikhail A. Ivanov, Jürgen G. Körner, Sergey G. Kovalenko, Pietro Santorelli, and Gozyal G. Saidullaeva

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-02-04

Description: Author(s): Mikhail A. Ivanov, Jürgen G. Körner, Sergey G. Kovalenko, Pietro Santorelli, and Gozyal G. Saidullaeva We provide new values for the model parameters of the covariant constituent quark model (with built-in infrared confinement) in the meson sector by a fit to the leptonic decay constants and a number of electromagnetic decays. We then evaluate, in a parameter-free way, the form factors of the B ( B s )→ P ... [Phys. Rev. D 85, 034004] Published Fri Feb 03, 2012

Keywords: Strong interactions & Lattice methods

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Bottom-quark mass from finite energy QCD sum rules (2012)

S. Bodenstein, J. Bordes, C. A. Dominguez, J. Peñarrocha, and K. Schilcher

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-02-04

Description: Author(s): S. Bodenstein, J. Bordes, C. A. Dominguez, J. Peñarrocha, and K. Schilcher Finite energy QCD sum rules involving both inverse- and positive-moment integration kernels are employed to determine the bottom-quark mass. The result obtained in the MS̅ scheme at a reference scale of 10 GeV is m ̅ b (10 GeV)=3623(9) MeV . This value translates into a scale-invariant... [Phys. Rev. D 85, 034003] Published Fri Feb 03, 2012

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Flavor SU(4) breaking between effective couplings (2012)

Bruno El-Bennich, Gastão Krein, Lei Chang, Craig D. Roberts, and David J. Wilson

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-02-08

Description: Author(s): Bruno El-Bennich, Gastão Krein, Lei Chang, Craig D. Roberts, and David J. Wilson Using a framework in which all elements are constrained by Dyson-Schwinger equation studies in QCD, and therefore incorporate a consistent, direct and simultaneous description of light- and heavy-quarks and the states they constitute, we analyze the accuracy of S U (4) -flavor symmetry relations betwee... [Phys. Rev. D 85, 031502] Published Tue Feb 07, 2012

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Analysis of B_{d,s} mixing angles in the presence of new physics and an update of B_{s}→K[over ¯]^{0*}K^{0*} (2012)

Sébastien Descotes-Genon, Joaquim Matias, and Javier Virto

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-02-08

Description: Author(s): Sébastien Descotes-Genon, Joaquim Matias, and Javier Virto We discuss a simple approach to measure the weak mixing angles ϕ s and ϕ d of the B s and B d systems in the presence of New Physics. We present a new expression that allows one to measure directly ϕ d , s NP if New Physics contributes significantly to the mixing only. We apply the method to specific pengui... [Phys. Rev. D 85, 034010] Published Tue Feb 07, 2012

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Subtraction scheme for next-to-next-to-leading order computations (2012)

Radja Boughezal, Kirill Melnikov, and Frank Petriello

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-02-15

Description: Author(s): Radja Boughezal, Kirill Melnikov, and Frank Petriello We use the known soft and collinear limits of tree- and one-loop scattering amplitudes—computed over a decade ago—to explicitly construct a subtraction scheme for next-to-next-to-leading order (NNLO) computations. Our approach combines partitioning of the final-state phase-space together with the te... [Phys. Rev. D 85, 034025] Published Tue Feb 14, 2012

Keywords: Strong interactions & Lattice methods

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Heavy quark spin symmetry breaking in near-threshold J^{PC}=1^{--} quarkoniumlike resonances (2012)

M. B. Voloshin

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-02-15

Description: Author(s): M. B. Voloshin A mixing of near-threshold quarkoniumlike resonances with heavy meson-antimeson pairs results in an enhancement of heavy quark spin symmetry breaking, since the meson pairs are not eigenstates of the heavy quark spin. The decomposition of P -wave states of meson pairs in terms of the heavy quark pair... [Phys. Rev. D 85, 034024] Published Tue Feb 14, 2012

Keywords: Strong interactions & Lattice methods

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Bosonic stringlike behavior and the ultraviolet filtering of QCD (2012)

Ahmed S. Bakry, Derek B. Leinweber, and Anthony G. Williams

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-02-17

Description: Author(s): Ahmed S. Bakry, Derek B. Leinweber, and Anthony G. Williams The gluonic action density is calculated in static mesons at finite temperature just below the deconfinement point. Our focus is to elucidate the role of vacuum ultraviolet fluctuations which are filtered using an improved smearing algorithm. In the intermediate source separation distance, where the... [Phys. Rev. D 85, 034504] Published Thu Feb 16, 2012

Keywords: Strong interactions & Lattice methods

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How to improve top-quark tagging (2012)

Tilman Plehn, Michael Spannowsky, and Michihisa Takeuchi

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-02-17

Description: Author(s): Tilman Plehn, Michael Spannowsky, and Michihisa Takeuchi In time for the first tests on LHC data we introduce a set of improvements and tests of purely kinematic top tagging algorithms. First, we show how different jet algorithms can be used for different transverse momentum regimes. Combining pruning and filtering in the reconstruction can enhance the si... [Phys. Rev. D 85, 034029] Published Thu Feb 16, 2012

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Three-gluon contribution to the single spin asymmetry in Drell-Yan and direct-photon processes (2012)

Yuji Koike and Shinsuke Yoshida

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-02-18

Description: Author(s): Yuji Koike and Shinsuke Yoshida We derive the single-spin-dependent cross section for the Drell-Yan lepton-pair production and the direct-photon production in the p p collision induced by the twist-3 three-gluon correlation functions in the transversely polarized nucleon in the leading order with respect to the QCD coupling constan... [Phys. Rev. D 85, 034030] Published Fri Feb 17, 2012

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B-meson semi-inclusive decay to 2^{-+} charmonium in nonrelativistic QCD and X(3872) (2012)

Ying Fan, Jin-Zhao Li, Ce Meng, and Kuang-Ta Chao

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-02-22

Description: Author(s): Ying Fan, Jin-Zhao Li, Ce Meng, and Kuang-Ta Chao The semi-inclusive B -meson decay into spin-singlet D -wave 2 -+ charmonium, B → η c 2 + X , is studied in nonrelativistic QCD. Both color-singlet and color-octet contributions are calculated at next-to-leading order in the strong coupling constant α s . The nonperturbative long-distance matrix elements are eva... [Phys. Rev. D 85, 034032] Published Tue Feb 21, 2012

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Final state interactions in single- and multiparticle inclusive cross sections for hadronic collisions (2012)

Alexander Mitov and George Sterman

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-12-27

Description: Author(s): Alexander Mitov and George Sterman We study the role of low momentum transfer (soft) interactions between high transverse momentum heavy particles and beam remnants (spectators) in hadronic collisions. Such final state interactions are power suppressed for single-particle inclusive cross sections whenever that particle is accompanied... [Phys. Rev. D 86, 114038] Published Wed Dec 26, 2012

Keywords: Strong interactions & Lattice methods

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Chiral symmetry restoration, the eigenvalue density of the Dirac operator, and the axial U(1) anomaly at finite temperature (2012)

Sinya Aoki, Hidenori Fukaya, and Yusuke Taniguchi

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-12-27

Description: Author(s): Sinya Aoki, Hidenori Fukaya, and Yusuke Taniguchi We reconsider constraints on the eigenvalue density of the Dirac operator in the chiral-symmetric phase of two-flavor QCD at finite temperature. To avoid possible ultraviolet divergences, we work on a lattice, employing the overlap Dirac operator, which ensures the exact “chiral” symmetry at finite ... [Phys. Rev. D 86, 114512] Published Wed Dec 26, 2012

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Meson and baryon dispersion relations with Brillouin fermions (2012)

Stephan Dürr, Giannis Koutsou, and Thomas Lippert

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-12-28

Description: Author(s): Stephan Dürr, Giannis Koutsou, and Thomas Lippert We study the dispersion relations of mesons and baryons built from Brillouin quarks on one N f =2 gauge ensemble provided by QCDSF. For quark masses up to the physical strange quark mass, there is hardly any improvement over the Wilson discretization, if either action is link-smeared and tree-level cl... [Phys. Rev. D 86, 114514] Published Thu Dec 27, 2012

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Rho-meson resonance broadening in QCD at finite temperature (2012)

Alejandro Ayala, C. A. Dominguez, M. Loewe, and Y. Zhang

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-12-28

Description: Author(s): Alejandro Ayala, C. A. Dominguez, M. Loewe, and Y. Zhang Thermal finite energy QCD sum rules for the vector current correlator are used to study quark-gluon deconfinement. Assuming ρ -meson saturation of the correlator in the hadronic sector, and the operator product expansion in QCD, we obtain the temperature behavior of the resonance parameters (coupling... [Phys. Rev. D 86, 114036] Published Thu Dec 27, 2012

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Poisson-random matrix transition in the QCD Dirac spectrum (2012)

Tamás G. Kovács and Ferenc Pittler

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-12-29

Description: Author(s): Tamás G. Kovács and Ferenc Pittler At zero temperature the lowest part of the spectrum of the QCD Dirac operator is known to consist of delocalized modes that are described by random matrix statistics. In the present paper we show that the nature of these eigenmodes changes drastically when the system is driven through the finite tem... [Phys. Rev. D 86, 114515] Published Fri Dec 28, 2012

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Revisiting D^{0}-D[over ¯]^{0} mixing using U-spin (2012)

Michael Gronau and Jonathan L. Rosner

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-12-21

Description: Author(s): Michael Gronau and Jonathan L. Rosner We prove that D 0 - D ̅ 0 mixing in the standard model occurs only at second order in U-spin breaking. The U-spin subgroup of SU(3) is found to be a powerful tool for analyzing the cancellation of intermediate-state contributions to the D 0 - D ̅ 0 mixing parameter y = Δ Γ /(2 Γ ). Cancellations due... [Phys. Rev. D 86, 114029] Published Thu Dec 20, 2012

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Possible bound state of the double heavy meson-baryon system (2012)

Qing Xu, Hong-ying Jin, and T. G. Steele

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-12-21

Description: Author(s): Qing Xu, Hong-ying Jin, and T. G. Steele We calculate the two-pion exchange potential between a heavy meson and a heavy baryon. We find this potential is as strong as the one-pion exchange potential between two heavy mesons and is enough to bind Λ b - B ̅ . Though our result is sensitive to the cutoff, the value of the cutoff is in the ... [Phys. Rev. D 86, 114032] Published Thu Dec 20, 2012

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Anomalous top couplings at hadron colliders revisited (2012)

Fabian Bach and Thorsten Ohl

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-12-21

Description: Author(s): Fabian Bach and Thorsten Ohl In an effective operator approach, the full set of leading contributions to anomalous top couplings comprises various new trilinear as well as higher interaction vertices, some of which are related to one another by gauge symmetry or equations of motion. In order to study trilinear top couplings to ... [Phys. Rev. D 86, 114026] Published Thu Dec 20, 2012

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Connecting neutron star observations to the high density equation of state of a quasiparticle model (2012)

Yan Yan, Jing Cao, Xin-Lian Luo, Wei-Min Sun, and Hongshi Zong

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-12-21

Description: Author(s): Yan Yan, Jing Cao, Xin-Lian Luo, Wei-Min Sun, and Hongshi Zong The observation of the 1.97±0.04 solar-mass neutronlike star gives constraint on the equation of state of cold, condensed matter. In this paper, the equation of state for both the pure quark star and the hybrid star with a quark core described by the quasiparticle model are considered. The parameter... [Phys. Rev. D 86, 114028] Published Thu Dec 20, 2012

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Signature of same-sign top pair production mediated by a nonuniversal Z^{′} with QCD next-to-leading order accuracy at the LHC (2012)

Bo Hua Li, Chong Sheng Li, Hai Tao Li, Yong Chuan Zhan, Yue Zhang, and Jian Wang

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-12-21

Description: Author(s): Bo Hua Li, Chong Sheng Li, Hai Tao Li, Yong Chuan Zhan, Yue Zhang, and Jian Wang We present a detailed study of the same-sign top pair production mediated by a nonuniversal Z ′ including production and decay at the Large Hadron Collider (LHC) at the QCD next-to-leading order (NLO) level, using the narrow width approximation and helicity amplitudes method. We find that the QCD NLO... [Phys. Rev. D 86, 114027] Published Thu Dec 20, 2012

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Strange quark contributions to nucleon mass and spin from lattice QCD (2012)

M. Engelhardt

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-12-21

Description: Author(s): M. Engelhardt Contributions of strange quarks to the mass and spin of the nucleon, characterized by the observables f T s and Δ s , respectively, are investigated within lattice QCD. The calculation employs a (2+1)-flavor mixed-action lattice scheme, thus treating the strange quark degrees of freedom in dynamical fas... [Phys. Rev. D 86, 114510] Published Thu Dec 20, 2012

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Precision tests of the J/ψ from full lattice QCD: Mass, leptonic width, and radiative decay rate to η_{c} (2012)

G. C. Donald, C. T. H. Davies, R. J. Dowdall, E. Follana, K. Hornbostel, J. Koponen, G. P. Lepage, and C. McNeile (HPQCD Collaboration)

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-11-03

Description: Author(s): G. C. Donald, C. T. H. Davies, R. J. Dowdall, E. Follana, K. Hornbostel, J. Koponen, G. P. Lepage, and C. McNeile (HPQCD Collaboration) We calculate the J / ψ mass, leptonic width and radiative decay rate to γ η c from lattice QCD including u , d and s quarks in the sea for the first time. We use the highly improved staggered quark formalism and nonperturbatively normalized vector currents for the leptonic and radiative decay rates. Our ... [Phys. Rev. D 86, 094501] Published Fri Nov 02, 2012

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Gauge and matter fields as surfaces and loops: An exploratory lattice study of the Z_{3} gauge-Higgs model (2012)

Christof Gattringer and Alexander Schmidt

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-11-08

Description: Author(s): Christof Gattringer and Alexander Schmidt We discuss a representation of the Z 3 gauge-Higgs lattice field theory at finite density in terms of dual variables, i.e., loops of flux and surfaces. In the dual representation the complex action problem of the conventional formulation is resolved and Monte Carlo simulations at arbitrary chemical p... [Phys. Rev. D 86, 094506] Published Wed Nov 07, 2012

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Lattice QCD study of the K^{*}(892) meson decay width (2012)

Ziwen Fu and Kan Fu

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-11-08

Description: Author(s): Ziwen Fu and Kan Fu We deliver an exploratory lattice QCD examination of the K * (892) meson decay width via the p -wave scattering phase shift of a pion-kaon ( π K ) system in the isospin I =1/2 channel. The modified Rummukainen-Gottlieb formula for a two-particle system with arbitrary mass is employed to extract phase shift... [Phys. Rev. D 86, 094507] Published Wed Nov 07, 2012

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Neutrino-induced forward meson-production reactions in nucleon resonance region (2012)

H. Kamano, S. X. Nakamura, T.-S. H. Lee, and T. Sato

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-11-09

Description: Author(s): H. Kamano, S. X. Nakamura, T.-S. H. Lee, and T. Sato As a first step toward developing a reaction model that enables a comprehensive description of neutrino-nucleon reactions in the nucleon resonance region, we have applied for the first time a dynamical coupled-channels model, which successfully describes π N , γ N → π N , η N , π π N , K Λ , and K Σ reactions up t... [Phys. Rev. D 86, 097503] Published Thu Nov 08, 2012

Keywords: Strong interactions & Lattice methods

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SU(2) low-energy constants from mixed-action lattice QCD (2012)

S. R. Beane, W. Detmold, P. M. Junnarkar, T. C. Luu, K. Orginos, A. Parreño, M. J. Savage, A. Torok, and A. Walker-Loud (NPLQCD Collaboration)

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-11-13

Description: Author(s): S. R. Beane, W. Detmold, P. M. Junnarkar, T. C. Luu, K. Orginos, A. Parreño, M. J. Savage, A. Torok, and A. Walker-Loud (NPLQCD Collaboration) An analysis of the pion mass and pion decay constant is performed using mixed-action lattice QCD calculations with domain-wall valence quarks on ensembles of rooted, staggered n f =2+1 configurations generated by the MILC Collaboration. Calculations were performed at two lattice spacings of b ≈0.125 f... [Phys. Rev. D 86, 094509] Published Mon Nov 12, 2012

Keywords: Strong interactions & Lattice methods

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Precise heavy-light meson masses and hyperfine splittings from lattice QCD including charm quarks in the sea (2012)

R. J. Dowdall, C. T. H. Davies, T. C. Hammant, and R. R. Horgan (HPQCD Collaboration)

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-11-13

Description: Author(s): R. J. Dowdall, C. T. H. Davies, T. C. Hammant, and R. R. Horgan (HPQCD Collaboration) We present improved results for the B and D meson spectrum from lattice QCD including the effect of u / d , s and c quarks in the sea. For the B mesons the highly improved staggered quark action is used for the sea and light valence quarks and nonrelativistic QCD for the b quark including O ( α s ) radiati... [Phys. Rev. D 86, 094510] Published Mon Nov 12, 2012

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Extraction of meson resonances from three-pions photo-production reactions (2012)

S. X. Nakamura, H. Kamano, T.-S. H. Lee, and T. Sato

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-12-08

Description: Author(s): S. X. Nakamura, H. Kamano, T.-S. H. Lee, and T. Sato We investigate the model dependence of meson resonance properties extracted from the Dalitz-plot analysis of the three-pions photo-production reactions on the nucleon. Within a unitary model developed in our earlier work, we generate Dalitz-plot distributions as data to perform an isobar model fit t... [Phys. Rev. D 86, 114012] Published Fri Dec 07, 2012

Keywords: Strong interactions & Lattice methods

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Line shape of ψ(3770) in e^{+}e^{-}→DD[over ¯] (2012)

N. N. Achasov and G. N. Shestakov

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-12-08

Description: Author(s): N. N. Achasov and G. N. Shestakov Interference phenomena observed in the ψ (3770) resonance region in the reactions e + e - → D D ̅ are analyzed. To avoid ambiguities in the determination of the ψ (3770) resonance parameters, when analyzing data between the D D ̅ and D D ̅ π thresholds, the amplitudes satisfying the elasti... [Phys. Rev. D 86, 114013] Published Fri Dec 07, 2012

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N-jet event shapes as probes of nuclear dynamics (2012)

Zhong-Bo Kang, Sonny Mantry, and Jian-Wei Qiu

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-12-08

Description: Author(s): Zhong-Bo Kang, Sonny Mantry, and Jian-Wei Qiu We propose the use of N -jettiness ( τ N ), a global event shape, as a probe of nuclear dynamics in lepton-nucleus collisions. It characterizes the amount of soft radiation between the jet and nuclear beam directions. We give a new factorization formula for the 1-jettiness ( τ 1 ) distribution for the prod... [Phys. Rev. D 86, 114011] Published Fri Dec 07, 2012

Keywords: Strong interactions & Lattice methods

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Gluon chain formation in presence of static charges (2012)

A. Ostrander, E. Santopinto, A. P. Szczepaniak, and A. Vassallo

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-12-11

Description: Author(s): A. Ostrander, E. Santopinto, A. P. Szczepaniak, and A. Vassallo We consider the origins of the gluon chain model. The model serves as a realization of the dynamics of the chromoelectric flux between static quark-antiquark sources. The derivation is based on the large- N C limit of the Coulomb gauge Hamiltonian in the presence of a background field introduced to mo... [Phys. Rev. D 86, 114015] Published Mon Dec 10, 2012

Keywords: Strong interactions & Lattice methods

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Potential of the effective Polyakov line action from the underlying lattice gauge theory (2012)

Jeff Greensite

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-12-18

Description: Author(s): Jeff Greensite I adapt a numerical method, previously applied to investigate the Yang-Mills vacuum wave functional, to the problem of extracting the effective Polyakov line action from SU( N ) lattice gauge theories, with or without matter fields. The method can be used to find the variation of the effective Polyako... [Phys. Rev. D 86, 114507] Published Mon Dec 17, 2012

Keywords: Strong interactions & Lattice methods

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Low-lying scalars in an extended linear σ model (2012)

Tamal K. Mukherjee, Mei Huang, and Qi-Shu Yan

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-12-18

Description: Author(s): Tamal K. Mukherjee, Mei Huang, and Qi-Shu Yan We formulate an extended linear σ model of a quarkonia nonet and a tetraquark nonet as well as a complex isosinglet (glueball) by virtue of chiral symmetry S U L (3)× S U R (3) and U A (1) symmetry. In the linear realization formalism, we study the mass spectra and components of the low-lying scalars and pse... [Phys. Rev. D 86, 114022] Published Mon Dec 17, 2012

Keywords: Strong interactions & Lattice methods

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Direct bound on the minimal universal extra dimension model from the tt[over ¯] resonance search at the Tevatron (2012)

Sanghyeon Chang, Kang Young Lee, So Young Shim, and Jeonghyeon Song

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-12-18

Description: Author(s): Sanghyeon Chang, Kang Young Lee, So Young Shim, and Jeonghyeon Song In the minimal universal extra dimension model, the second Kaluza-Klein gluon g (2) has loop-induced vertices with the standard model quarks, mediated by the first Kaluza-Klein modes of the quark and the gluon/Higgs boson. With a top quark pair, this vertex is enhanced by the cooperation of strong co... [Phys. Rev. D 86, 117503] Published Mon Dec 17, 2012

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Effects of gluon number fluctuations on γγ collisions at high energies (2012)

V. P. Gonçalves and J. T. de Santana Amaral

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-09-25

Description: Author(s): V. P. Gonçalves and J. T. de Santana Amaral We investigate the effects of gluon number fluctuations on the total γ γ , γ * γ * cross sections and the photon structure function F 2 γ ( x , Q 2 ). Considering a model which relates the dipole-dipole and dipole-hadron scattering amplitudes, we estimate these observables by using event-by-event and physical am... [Phys. Rev. D 86, 054019] Published Mon Sep 24, 2012

Keywords: Strong interactions & Lattice methods

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Mass spectrum and strong decays of isoscalar tensor mesons (2012)

Zao-Chen Ye ((叶早晨)), Xiao Wang ((王霄)), Xiang Liu ((刘翔)), and Qiang Zhao ((赵强))

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-09-27

Description: Author(s): Zao-Chen Ye ((叶早晨)), Xiao Wang ((王霄)), Xiang Liu ((刘翔)), and Qiang Zhao ((赵强)) In this work, we present a systematic study of the observed isoscalar tensor f 2 states. With the detailed analysis of the mass spectrum and calculation of the f 2 two-body strong decays, we extract information from their underlying structures and try to categorize them into the conventional tensor me... [Phys. Rev. D 86, 054025] Published Wed Sep 26, 2012

Keywords: Strong interactions & Lattice methods

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Thermodynamic instabilities in dynamical quark models with complex conjugate mass poles (2012)

S. Benić, D. Blaschke, and M. Buballa

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-10-02

Description: Author(s): S. Benić, D. Blaschke, and M. Buballa We show that the Cornwall-Jackiw-Tomboulis thermodynamic potential of dynamical quark models with a quark propagator represented by complex conjugate mass poles inevitably exhibits thermodynamic instabilities. We find that the minimal coupling of the quark sector to a Polyakov loop potential can str... [Phys. Rev. D 86, 074002] Published Mon Oct 01, 2012

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Nucleon axial charge in lattice QCD with controlled errors (2012)

S. Capitani, M. Della Morte, G. von Hippel, B. Jäger, A. Jüttner, B. Knippschild, H. B. Meyer, and H. Wittig

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-10-02

Description: Author(s): S. Capitani, M. Della Morte, G. von Hippel, B. Jäger, A. Jüttner, B. Knippschild, H. B. Meyer, and H. Wittig We report on our calculation of the nucleon axial charge g A in QCD with two flavors of dynamical quarks. A detailed investigation of systematic errors is performed, with a particular focus on contributions from excited states to three-point correlation functions. The use of summed operator insertion... [Phys. Rev. D 86, 074502] Published Mon Oct 01, 2012

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Z_{b}(10610) and Z_{b}(10650) decays to bottomonium plus pion (2012)

Xin Li and M. B. Voloshin

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-10-02

Description: Author(s): Xin Li and M. B. Voloshin We consider the transitions from the Z b (10610) and Z b (10650) resonances to the states of bottomonium with emission of a pion. The Z b resonances are viewed as “molecular” objects of a large spatial size made of heavy B (*) mesons, while the states of bottomonium are considered to be compact, so that a... [Phys. Rev. D 86, 077502] Published Mon Oct 01, 2012

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Gauge-boson production with multiple jets near threshold (2012)

Xiaohui Liu, Sonny Mantry, and Frank Petriello

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-10-03

Description: Author(s): Xiaohui Liu, Sonny Mantry, and Frank Petriello Signatures of new physics beyond the Standard Model are often characterized by large missing transverse energy (E̸ T ) produced in association with multiple jets. The dominant Standard Model background to such processes comes from gauge-boson production in association with jets. A standard search stra... [Phys. Rev. D 86, 074004] Published Tue Oct 02, 2012

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Direct contour deformation with arbitrary masses in the loop (2012)

Sebastian Becker and Stefan Weinzierl

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-10-09

Description: Author(s): Sebastian Becker and Stefan Weinzierl We present a method, which constructs a suitable deformation vector in loop momentum space, when the loop integration is done numerically with the help of the subtraction method. The method presented here extends previously discussed techniques from the massless case to the general case of arbitrary... [Phys. Rev. D 86, 074009] Published Mon Oct 08, 2012

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Resummation effects in vector-boson and Higgs associated production (2012)

S. Dawson, T. Han, W. K. Lai, A. K. Leibovich, and I. Lewis

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-10-09

Description: Author(s): S. Dawson, T. Han, W. K. Lai, A. K. Leibovich, and I. Lewis Fixed-order QCD radiative corrections to the vector-boson and Higgs associated production channels, p p → V H ( V = W ± , Z ), at hadron colliders are well understood. We combine higher-order perturbative QCD calculations with soft gluon resummation of both threshold logarithms and logarithms which are import... [Phys. Rev. D 86, 074007] Published Mon Oct 08, 2012

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A subset solution to the sign problem in random matrix simulations (2012)

Jacques Bloch

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-10-09

Description: Author(s): Jacques Bloch We present a solution to the sign problem in dynamical random matrix simulations of a two-matrix model at nonzero chemical potential. The sign problem, caused by the complex fermion determinants, is solved by gathering the matrices into subsets, whose sums of determinants are real and positive even ... [Phys. Rev. D 86, 074505] Published Mon Oct 08, 2012

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pp[over ¯] mass threshold structure in ψ(3686) radiative decay revisited (2012)

J. Haidenbauer and Ulf-G. Meißner

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-10-09

Description: Author(s): J. Haidenbauer and Ulf-G. Meißner The near-threshold behavior of the p p ̅ invariant mass spectrum from the ψ (3686)→ γ p p ̅ decay reported recently by the BESIII Collaboration is analyzed. The enhancement in the p p ̅ invariant mass spectrum near threshold is nicely reproduced by the p p ̅ final-state interact... [Phys. Rev. D 86, 077503] Published Mon Oct 08, 2012

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Effect of changes of variable flavor number scheme on parton distribution functions and predicted cross sections (2012)

R. S. Thorne

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-10-10

Description: Author(s): R. S. Thorne I consider variations in the definitions, at next-to-leading order and at next-to-next-to leading order, of a general-mass variable flavor number scheme (GM-VFNS) for heavy flavor structure functions. I also define a new “optimal” scheme choice improving the smoothness of the transition from one fla... [Phys. Rev. D 86, 074017] Published Tue Oct 09, 2012

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Minimal Landau background gauge on the lattice (2012)

Attilio Cucchieri and Tereza Mendes

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-10-10

Description: Author(s): Attilio Cucchieri and Tereza Mendes We present the first numerical implementation of the minimal Landau background gauge for Yang-Mills theory on the lattice. Our approach is a simple generalization of the usual minimal Landau gauge and is formulated for the general SU(N) gauge group. We also report on preliminary tests of the method ... [Phys. Rev. D 86, 071503] Published Tue Oct 09, 2012

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|V_{cd}| from D meson leptonic decays (2012)

Heechang Na, Christine T. H. Davies, Eduardo Follana, G. Peter Lepage, and Junko Shigemitsu

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-09-22

Description: Author(s): Heechang Na, Christine T. H. Davies, Eduardo Follana, G. Peter Lepage, and Junko Shigemitsu We present an update of the D meson decay constant f D using the highly improved staggered quark action for valence charm and light quarks on MILC N f =2+1 lattices. The new determination incorporates HPQCD’s improved scale r 1 N f =2+1 =0.3133(23) fm, accurately retuned bare charm quark masses and data fr... [Phys. Rev. D 86, 054510] Published Fri Sep 21, 2012

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Double charm decays of B_{c} meson in the perturbative QCD approach (2012)

Zhou Rui, Zhitian Zou, and Cai-Dian Lü

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-10-11

Description: Author(s): Zhou Rui, Zhitian Zou, and Cai-Dian Lü We study the double charm decays of B c meson, by employing the perturbative QCD approach based on k T factorization. In this approach, we include the nonfactorizable emission diagrams and W annihilation diagrams, which are neglected in the previous naive factorization approach. The former are importa... [Phys. Rev. D 86, 074019] Published Wed Oct 10, 2012

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Self-consistency requirements of the renormalization group for setting the renormalization scale (2012)

Stanley J. Brodsky and Xing-Gang Wu

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-09-25

Description: Author(s): Stanley J. Brodsky and Xing-Gang Wu In conventional treatments, predictions from fixed-order perturbative QCD calculations cannot be fixed with certainty because of ambiguities in the choice of the renormalization scale as well as the renormalization scheme. In this paper we present a general discussion of the constraints of the renor... [Phys. Rev. D 86, 054018] Published Mon Sep 24, 2012

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Precision direct photon and W-boson spectra at high p_{T} and comparison to LHC data (2012)

Thomas Becher, Christian Lorentzen, and Matthew D. Schwartz

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-09-27

Description: Author(s): Thomas Becher, Christian Lorentzen, and Matthew D. Schwartz The differential p T spectrum for vector boson production is computed at next-to-leading fixed order and including the resummation of threshold logarithms at next-to-next-to-leading logarithmic accuracy. A comparison is made to atlas data on direct photon and W production at high transverse momentum ... [Phys. Rev. D 86, 054026] Published Wed Sep 26, 2012

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Parton-distribution functions for the pion and kaon in the gauge-invariant nonlocal chiral-quark model (2012)

Seung-il Nam

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-10-02

Description: Author(s): Seung-il Nam We investigate the parton-distribution functions (PDFs) for the positively charged pion and kaon at a low renormalization scale ∼1 GeV. To this end, we employ the gauge-invariant effective chiral action from the nonlocal chiral-quark model, resulting in the vector currents being conserved. All the ... [Phys. Rev. D 86, 074005] Published Mon Oct 01, 2012

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Pair production of MSSM Higgs bosons in the nondecoupling region at the LHC (2012)

Neil D. Christensen, Tao Han, and Tong Li

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-10-02

Description: Author(s): Neil D. Christensen, Tao Han, and Tong Li We consider the Higgs boson signals from pair production at the LHC within the framework of the minimal supersymmetric standard model (MSSM) in the nondecoupling (low- m A ) region. In light of the recent observation of a SM-like Higgs boson, we argue that the exploration for Higgs pair production at t... [Phys. Rev. D 86, 074003] Published Mon Oct 01, 2012

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Mean field theory of effective spin models as a baryon fugacity expansion (2012)

Jeff Greensite and Kim Splittorff

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-10-02

Description: Author(s): Jeff Greensite and Kim Splittorff The free energy of effective spin or “Polyakov line” models with a chemical potential, based on the U( N ) group, does not depend on the chemical potential. In a mean field-inspired expansion, we show how the condition of unit determinant, taking U( N ) to SU( N ), reintroduces the chemical potential, and... [Phys. Rev. D 86, 074501] Published Mon Oct 01, 2012

Keywords: Strong interactions & Lattice methods

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Overpopulated gauge fields on the lattice (2012)

Jürgen Berges, Sören Schlichting, and Dénes Sexty

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-10-03

Description: Author(s): Jürgen Berges, Sören Schlichting, and Dénes Sexty We study nonequilibrium dynamics of S U (2) pure gauge theory starting from initial overpopulation, where intense classical gauge fields are characterized by a single momentum scale Q s . Classical-statistical lattice simulations indicate a quick evolution towards an approximate scaling behavior with ex... [Phys. Rev. D 86, 074006] Published Tue Oct 02, 2012

Keywords: Strong interactions & Lattice methods

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Heavy meson masses and decay constants from relativistic heavy quarks in full lattice QCD (2012)

C. McNeile, C. T. H. Davies, E. Follana, K. Hornbostel, and G. P. Lepage (HPQCD Collaboration)

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-10-03

Description: Author(s): C. McNeile, C. T. H. Davies, E. Follana, K. Hornbostel, and G. P. Lepage (HPQCD Collaboration) We determine masses and decay constants of heavy-heavy and heavy-charm pseudoscalar mesons as a function of heavy quark mass using a fully relativistic formalism known as highly improved staggered quarks for the heavy quark. We are able to cover the region from the charm quark mass to the bottom qua... [Phys. Rev. D 86, 074503] Published Tue Oct 02, 2012

Keywords: Strong interactions & Lattice methods

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Critical analysis of topological charge determination in the background of center vortices in SU(2) lattice gauge theory (2012)

R. Höllwieser, M. Faber, and U. M. Heller

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-07-31

Description: Author(s): R. Höllwieser, M. Faber, and U. M. Heller We analyze topological charge contributions from classical S U (2) center vortices with shapes of planes and spheres using different topological charge definitions, namely the center vortex picture of topological charge, a discrete version of F F ˜ in the plaquette or hypercube definitions and the latti... [Phys. Rev. D 86, 014513] Published Mon Jul 30, 2012

Keywords: Strong interactions & Lattice methods

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Double cc[over ¯] production at LHCb (2012)

A. V. Berezhnoy, A. K. Likhoded, A. V. Luchinsky, and A. A. Novoselov

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-08-16

Description: Author(s): A. V. Berezhnoy, A. K. Likhoded, A. V. Luchinsky, and A. A. Novoselov Theoretical predictions are presented for the production of two J / ψ -mesons, of a J / ψ -meson in association with an open charm hadron, and of two open charm hadrons from two c c ̅ pairs in the LHC conditions. Processes in both single- and double-parton scattering mechanisms are taken into consid... [Phys. Rev. D 86, 034017] Published Wed Aug 15, 2012

Keywords: Strong interactions & Lattice methods

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0^{++} glueball wave function for improved SU(2) lattice gauge theory in (2+1) dimensions (2012)

Jun-Qin Jiang

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-08-16

Description: Author(s): Jun-Qin Jiang Using the improved lattice gauge field Hamiltonian and the truncated eigenvalue equation method, we compute the 0 ++ glueball wave function of (2+1)-dimensional SU(2) gauge field theory. The result shows a good scaling behavior in the weak coupling region 3≤1/ g 2 ≤6. [Phys. Rev. D 86, 034504] Published Wed Aug 15, 2012

Keywords: Strong interactions & Lattice methods

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Generalized unparticles, zeros of the Green function, and momentum space topology of the lattice model with overlap fermions (2012)

M. A. Zubkov

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-08-21

Description: Author(s): M. A. Zubkov The definition of topological invariants N ˜ 4 , N ˜ 5 suggested in M. A. Zubkov and G. E. Volovik Nucl. Phys. B860 295 (2012) is extended to the case when there are zeros and poles of the Green function in momentum space. It is shown how to extend the index theorem suggested by Zubkov and Volovik to t... [Phys. Rev. D 86, 034505] Published Mon Aug 20, 2012

Keywords: Strong interactions & Lattice methods

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Bulk viscosity and the phase transition of the linear sigma model (2012)

Antonio Dobado and Juan M. Torres-Rincon

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-10-16

Description: Author(s): Antonio Dobado and Juan M. Torres-Rincon In this work, we deal with the critical behavior of the bulk viscosity in the linear sigma model (L σ M) as an example of a system which can be treated by using different techniques. Starting from the Boltzmann-Uehling-Uhlenbeck equation, we compute the bulk viscosity over entropy density of the L σ M i... [Phys. Rev. D 86, 074021] Published Mon Oct 15, 2012

Keywords: Strong interactions & Lattice methods

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Isospin breaking, coupled-channel effects, and X(3872) (2012)

Ning Li and Shi-Lin Zhu

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-10-18

Description: Author(s): Ning Li and Shi-Lin Zhu We reinvestigate the possibility of X (3872) as a D D ̅ * molecule with J P C =1 ++ within the framework of both the one-pion-exchange model and the one-boson-exchange model. After careful treatment of the S - D wave mixing, the mass difference between the neutral and charged D ( D * ) mesons and the coup... [Phys. Rev. D 86, 074022] Published Wed Oct 17, 2012

Keywords: Strong interactions & Lattice methods

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Inclusive h_{c} production at B factories (2012)

Yu Jia, Wen-Long Sang, and Jia Xu

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-10-18

Description: Author(s): Yu Jia, Wen-Long Sang, and Jia Xu Within the nonrelativistic QCD (NRQCD) factorization framework, we investigate the inclusive production of the h c meson associated with either light hadrons or charmed hadrons at B factory energy √ s =10.58 GeV. Both the leading color-singlet and color-octet channels are included. For the h c producti... [Phys. Rev. D 86, 074023] Published Wed Oct 17, 2012

Keywords: Strong interactions & Lattice methods

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Lattice determination of the K→(ππ)_{I=2} decay amplitude A_{2} (2012)

T. Blum, P. A. Boyle, N. H. Christ, N. Garron, E. Goode, T. Izubuchi, C. Jung, C. Kelly, C. Lehner, M. Lightman, Q. Liu, A. T. Lytle, R. D. Mawhinney, C. T. Sachrajda, A. Soni, and C. Sturm (The RBC and UKQCD Collaborations)

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-10-19

Description: Author(s): T. Blum, P. A. Boyle, N. H. Christ, N. Garron, E. Goode, T. Izubuchi, C. Jung, C. Kelly, C. Lehner, M. Lightman, Q. Liu, A. T. Lytle, R. D. Mawhinney, C. T. Sachrajda, A. Soni, and C. Sturm (The RBC and UKQCD Collaborations) We describe the computation of the amplitude A 2 for a kaon to decay into two pions with isospin I =2. The results presented in [ T. Blum et al. Phys. Rev. Lett. 108 141601 (2012) ] from an analysis of 63 gluon configurations are updated to 146 configurations giving Re A 2 =1.381(46) stat (258) syst 10 -8 Ge... [Phys. Rev. D 86, 074513] Published Thu Oct 18, 2012

Keywords: Strong interactions & Lattice methods

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Inclusive charmonium production in the PANDA experiment (2012)

A. V. Luchinsky and S. V. Poslavsky

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-04-17

Description: Author(s): A. V. Luchinsky and S. V. Poslavsky The production of the charmonium states in p p ̅ experiments is considered at the energy rates near the threshold in next to leading order. Such a consideration allows one to obtain nonzero distributions over the transverse momentum of the final charmonium and gives a natural explanation to th... [Phys. Rev. D 85, 074016] Published Mon Apr 16, 2012

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Finite isospin density probe for conformality (2012)

Michael I. Buchoff

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-04-06

Description: Author(s): Michael I. Buchoff A new method of employing an isospin chemical potential for QCD-like theories with different number of colors, number of fermion flavors, and in different fermion representations is proposed. The isospin chemical potential, which can be simulated on the lattice due to its positive definite determina... [Phys. Rev. D 85, 074503] Published Thu Apr 05, 2012

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Strong decays of K_{1} resonances (2012)

A. Tayduganov, E. Kou, and A. Le Yaouanc

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-04-11

Description: Author(s): A. Tayduganov, E. Kou, and A. Le Yaouanc We investigate the K 1 → K π π strong interaction decays. Using the 3 P 0 quark-pair-creation model (QPCM) to derive the basic parametrization, we discuss in detail how to obtain the various partial wave amplitudes into the possible quasi-two-body decay channels as well as their relative phases from the cu... [Phys. Rev. D 85, 074011] Published Tue Apr 10, 2012

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Quark-lepton symmetric model at the LHC (2012)

Jackson D. Clarke, Robert Foot, and Raymond R. Volkas

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-04-11

Description: Author(s): Jackson D. Clarke, Robert Foot, and Raymond R. Volkas We investigate the quark-lepton symmetric model of Foot and Lew in the context of the Large Hadron Collider (LHC). In this “bottom-up” extension to the standard model, quark-lepton symmetry is achieved by introducing a gauged “leptonic color” symmetry which is spontaneously broken above the electrow... [Phys. Rev. D 85, 074012] Published Tue Apr 10, 2012

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Prompt J/ψ production in the Regge limit of QCD: From the Tevatron to the LHC (2012)

V. A. Saleev, M. A. Nefedov, and A. V. Shipilova

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-04-11

Description: Author(s): V. A. Saleev, M. A. Nefedov, and A. V. Shipilova We study prompt J / ψ -meson hadroproduction invoking the hypothesis of gluon Reggeization in t -channel exchanges at high energy and the factorization formalism of nonrelativistic quantum chromodynamics at the leading order in the strong-coupling constant α s and the relative velocity of quarks v . The t... [Phys. Rev. D 85, 074013] Published Tue Apr 10, 2012

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Quark-meson-diquark model for two-color QCD (2012)

Nils Strodthoff, Bernd-Jochen Schaefer, and Lorenz von Smekal

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-04-07

Description: Author(s): Nils Strodthoff, Bernd-Jochen Schaefer, and Lorenz von Smekal We introduce a two-flavor quark-meson-diquark model for two-color QCD and its extensions to include gauge-field dynamics as described by the Polyakov loop. Grand potential and phase structure are being studied both in mean-field approximation and with the functional renormalization group. The model ... [Phys. Rev. D 85, 074007] Published Fri Apr 06, 2012

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Lattice determination of the hadronic contribution to the muon g-2 using dynamical domain wall fermions (2012)

Peter Boyle, Luigi Del Debbio, Eoin Kerrane, and James Zanotti

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-04-07

Description: Author(s): Peter Boyle, Luigi Del Debbio, Eoin Kerrane, and James Zanotti We present a calculation of the leading-order hadronic contribution to the anomalous magnetic moment of the muon for a dynamical simulation of 2+1 flavor QCD using domain wall fermions. The electromagnetic 2-point function is evaluated on the lattice gauge configurations and this is fitted to a cont... [Phys. Rev. D 85, 074504] Published Fri Apr 06, 2012

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Global fitting of single spin asymmetry: An attempt (2012)

Zhong-Bo Kang and Alexei Prokudin

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-04-10

Description: Author(s): Zhong-Bo Kang and Alexei Prokudin We present an attempt of global analysis of semi-inclusive deep inelastic scattering ℓ p ↑ → ℓ ′ π X data on single spin asymmetries and data on left-right asymmetry A N in p ↑ p → π X in order to simultaneously extract information on the Sivers function and the twist-three quark-gluon Efremov-Teryaev-Qiu-Sterma... [Phys. Rev. D 85, 074008] Published Mon Apr 09, 2012

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Implications of family nonuniversal Z^{′} model on B→K_{0}^{*}(1430)π decays (2012)

Ying Li, Xiao-Jiao Fan, Juan Hua, and En-Lei Wang

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-04-10

Description: Author(s): Ying Li, Xiao-Jiao Fan, Juan Hua, and En-Lei Wang Within the QCD factorization formalism, we study the possible impacts of the nonuniversal Z ′ model, which provides a flavor-changing neutral current at the tree level, on rare decays B → K 0 * (1430) π . Under two different scenarios, Scenerio-1 (S1) and Scenerio-2 (S2), for identifying the scalar meson K 0 ... [Phys. Rev. D 85, 074010] Published Mon Apr 09, 2012

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Elastic pp-scattering at sqrt[s]=7 TeV with the genuine Orear regime and the dip (2012)

I. M. Dremin and V. A. Nechitailo

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-04-10

Description: Author(s): I. M. Dremin and V. A. Nechitailo The unitarity condition unambiguously requires the Orear region to appear in between the diffraction cone at low transferred momenta and the hard parton scattering regime at high transferred momenta in hadron elastic scattering. It originates from rescattering of the diffraction cone processes. It i... [Phys. Rev. D 85, 074009] Published Mon Apr 09, 2012

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Factorization and resummation for dijet invariant mass spectra (2012)

Christian W. Bauer, Frank J. Tackmann, Jonathan R. Walsh, and Saba Zuberi

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-04-12

Description: Author(s): Christian W. Bauer, Frank J. Tackmann, Jonathan R. Walsh, and Saba Zuberi Multijet cross sections at the LHC and Tevatron are sensitive to several distinct kinematic energy scales. When measuring the dijet invariant mass m j j between two signal jets produced in association with other jets or weak bosons, m j j will typically be much smaller than the total partonic center-of-... [Phys. Rev. D 85, 074006] Published Wed Apr 11, 2012

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Investigating different structures of the Z_{b}(10610) and Z_{b}(10650) (2012)

Chun-Yu Cui, Yong-Lu Liu, and Ming-Qiu Huang

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-04-12

Description: Author(s): Chun-Yu Cui, Yong-Lu Liu, and Ming-Qiu Huang The recently observed narrow resonance Z b (10610) is examined with the assumptions both as a B * B ̅ molecular state and a [ b d ][ b ̅ u ̅ ] tetraquark state with quantum numbers I G J P =1 + 1 + . Possible interpolating currents are constructed to describe the Z b (10650) as an axial-vector B * B ̅... [Phys. Rev. D 85, 074014] Published Wed Apr 11, 2012

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Open charm effects in the explanation of the long-standing “ρπ puzzle” (2012)

Qian Wang, Gang Li, and Qiang Zhao

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-04-12

Description: Author(s): Qian Wang, Gang Li, and Qiang Zhao A detailed analysis of the open charm effects on the decays of J / ψ ( ψ ′ )→ V P is presented, where V stands for light vector meson and P for light pseudoscalar meson. These are the channels that the so-called “12% rule” of perturbative QCD (pQCD) is obviously violated. Nevertheless, they are also the cha... [Phys. Rev. D 85, 074015] Published Wed Apr 11, 2012

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Diagnosing new physics in b→cτν_{τ} decays in the light of the recent BABAR result (2012)

Alakabha Datta, Murugeswaran Duraisamy, and Diptimoy Ghosh

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-08-25

Description: Author(s): Alakabha Datta, Murugeswaran Duraisamy, and Diptimoy Ghosh The BABAR Collaboration has recently reported the measurement of the ratio of the branching fractions of B ̅ → D ( D * ) τ - ν ̅ τ to B ̅ → D ( D * ) ℓ - ν ̅ ℓ which deviates from the Standard Model prediction by 2 σ (2.7 σ ). This deviation goes up to 3.4 σ level when the two measurements in t... [Phys. Rev. D 86, 034027] Published Fri Aug 24, 2012

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Calculating loops without loop calculations: Next-to-leading order computation of pentaquark correlators (2012)

S. Groote, J. G. Körner, and A. A. Pivovarov

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-08-25

Description: Author(s): S. Groote, J. G. Körner, and A. A. Pivovarov We compute next-to-leading order (NLO) perturbative QCD corrections to the correlators of interpolating pentaquark currents and their absorptive parts. We employ modular techniques in configuration space which saves us from the onus of having to do loop calculations. The modular technique is explain... [Phys. Rev. D 86, 034023] Published Fri Aug 24, 2012

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Collins fragmentation function within the NJL-jet model (2012)

Hrayr H. Matevosyan, Anthony W. Thomas, and Wolfgang Bentz

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-08-25

Description: Author(s): Hrayr H. Matevosyan, Anthony W. Thomas, and Wolfgang Bentz The Nambu–Jona-Lasinio jet model is extended to accommodate hadronization of a transversely polarized quark in order to explore the Collins effect within a multihadron emission framework. This is accomplished by calculating the polarized quark spin flip probabilities after a pseudoscalar hadron emis... [Phys. Rev. D 86, 034025] Published Fri Aug 24, 2012

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Hadronic light-by-light scattering and the pion polarizability (2012)

Kevin T. Engel, Hiren H. Patel, and Michael J. Ramsey-Musolf

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-08-28

Description: Author(s): Kevin T. Engel, Hiren H. Patel, and Michael J. Ramsey-Musolf We compute the charged pion loop contribution to the light-by-light scattering amplitude for off-shell photons in chiral perturbation theory through next-to-leading order (NLO). We show that for small photon virtualities ( k 2 ≪ m π 2 ) the NLO contributions are relatively more important due to an accident... [Phys. Rev. D 86, 037502] Published Mon Aug 27, 2012

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85

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Muon-induced background study for an argon-based long baseline neutrino experiment (2012)

D. Barker, D.-M. Mei, and C. Zhang

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-09-05

Description: Author(s): D. Barker, D.-M. Mei, and C. Zhang We evaluated rates of transversing muons, muon-induced fast neutrons, and production of 40 Cl and other cosmogenically produced nuclei that pose as potential sources of background to the physics program proposed for an argon-based long baseline neutrino experiment at the Sanford Underground Research ... [Phys. Rev. D 86, 054001] Published Tue Sep 04, 2012

Keywords: Strong interactions & Lattice methods

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86

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Generic features of the phase transition in cold and dense quark matter (2012)

Kenji Fukushima

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-09-05

Description: Author(s): Kenji Fukushima We investigate the phase transition in cold and dense quark matter in an intuitive way that shares common features of the effective model approaches. We first express the quasiparticle contribution to the thermodynamic potential with the dynamical mass M and then discuss how we can understand the po... [Phys. Rev. D 86, 054002] Published Tue Sep 04, 2012

Keywords: Strong interactions & Lattice methods

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87

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Timelike and spacelike hard exclusive reactions (2012)

D. Müller, B. Pire, L. Szymanowski, and J. Wagner

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-08-25

Description: Author(s): D. Müller, B. Pire, L. Szymanowski, and J. Wagner We show to next-to-leading order accuracy in the strong coupling α s how the collinear factorization properties of QCD in the generalized Bjorken regime relate exclusive amplitudes for spacelike and timelike hadronic processes. This yields simple space-to-timelike relations linking the amplitudes for... [Phys. Rev. D 86, 031502] Published Fri Aug 24, 2012

Keywords: Strong interactions & Lattice methods

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88

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1+1+1 flavor QCD+QED simulation at the physical point (2012)

S. Aoki, K.-I. Ishikawa, N. Ishizuka, K. Kanaya, Y. Kuramashi, Y. Nakamura, Y. Namekawa, M. Okawa, Y. Taniguchi, A. Ukawa, N. Ukita, and T. Yoshié (PACS-CS Collaboration)

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-08-28

Description: Author(s): S. Aoki, K.-I. Ishikawa, N. Ishizuka, K. Kanaya, Y. Kuramashi, Y. Nakamura, Y. Namekawa, M. Okawa, Y. Taniguchi, A. Ukawa, N. Ukita, and T. Yoshié (PACS-CS Collaboration) We present the results of 1+1+1 flavor QCD+QED simulation at the physical point, in which the dynamical quark effects in QED and the up-down quark mass difference are incorporated by the reweighting technique. The physical quark masses together with the lattice spacing are determined with m π + , m K + , ... [Phys. Rev. D 86, 034507] Published Mon Aug 27, 2012

Keywords: Strong interactions & Lattice methods

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Confronting top A_{FB} with parity violation constraints (2012)

Moira I. Gresham, Ian-Woo Kim, Sean Tulin, and Kathryn M. Zurek

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-08-30

Description: Author(s): Moira I. Gresham, Ian-Woo Kim, Sean Tulin, and Kathryn M. Zurek We consider the implications of low-energy precision tests of parity violation on t -channel mediator models explaining the top A F B excess measured by the CDF and D0 Collaborations. Flavor-violating u - t or d - t couplings of new scalar or vector mediators generate at one-loop an anomalous contribution ... [Phys. Rev. D 86, 034029] Published Wed Aug 29, 2012

Keywords: Strong interactions & Lattice methods

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Inclusive b-jet and bb[over ¯]-dijet production at the LHC via Reggeized gluons (2012)

V. A. Saleev and A. V. Shipilova

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-08-31

Description: Author(s): V. A. Saleev and A. V. Shipilova We study inclusive b -jet and b b ̅ -dijet production at the CERN LHC invoking the hypothesis of gluon Reggeization in t -channel exchanges at high energy. The b -jet cross section includes contributions from open b -quark production and from b -quark production via gluon-to-bottom-pair fragmentatio... [Phys. Rev. D 86, 034032] Published Thu Aug 30, 2012

Keywords: Strong interactions & Lattice methods

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91

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S- and D-wave phase shifts in isospin-2 ππ scattering from lattice QCD (2012)

Jozef J. Dudek, Robert G. Edwards, and Christopher E. Thomas (for the Hadron Spectrum Collaboration)

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-08-31

Description: Author(s): Jozef J. Dudek, Robert G. Edwards, and Christopher E. Thomas (for the Hadron Spectrum Collaboration) The isospin-2 π π system provides a useful testing ground for determining elastic hadron scattering parameters from finite-volume spectra obtained using lattice QCD computations. A reliable determination of the excited state spectrum of two pions in a cubic box follows from variational analysis of co... [Phys. Rev. D 86, 034031] Published Thu Aug 30, 2012

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92

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Gauge-invariant formalism with a Dirac-mode expansion for confinement and chiral symmetry breaking (2012)

Shinya Gongyo, Takumi Iritani, and Hideo Suganuma

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-09-01

Description: Author(s): Shinya Gongyo, Takumi Iritani, and Hideo Suganuma Using the eigenmode of the Dirac operator D̸= γ μ D μ in quantum chromodynamics (QCD), we develop a manifestly gauge-covariant expansion and projection of the QCD operators such as the Wilson loop and the Polyakov loop. With this method, we perform a direct analysis of the correlation between confinemen... [Phys. Rev. D 86, 034510] Published Fri Aug 31, 2012

Keywords: Strong interactions & Lattice methods

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93

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Next-to-leading order QCD predictions for W+1 jet and W+2 jet production with at least one b jet at the 7 TeV LHC (2012)

J. M. Campbell, F. Caola, F. Febres Cordero, L. Reina, and D. Wackeroth

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-08-25

Description: Author(s): J. M. Campbell, F. Caola, F. Febres Cordero, L. Reina, and D. Wackeroth We provide predictions for the production of a W boson in association with up to two jets including at least one b jet at next-to-leading order (NLO) in QCD at the CERN Large Hadron Collider with 7 TeV center-of-mass energy. Both exclusive and inclusive event cross section and b -jet cross sections a... [Phys. Rev. D 86, 034021] Published Fri Aug 24, 2012

Keywords: Strong interactions & Lattice methods

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Charm-strange baryon strong decays in a chiral quark model (2012)

Lei-Hua Liu, Li-Ye Xiao, and Xian-Hui Zhong

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-08-25

Description: Author(s): Lei-Hua Liu, Li-Ye Xiao, and Xian-Hui Zhong The strong decays of charm-strange baryons up to N =2 shell are studied in a chiral quark model. The theoretical predictions for the well-determined charm-strange baryons, Ξ c * (2645), Ξ c (2790), and Ξ c (2815), are in good agreement with the experimental data. This model is also extended to analyze the s... [Phys. Rev. D 86, 034024] Published Fri Aug 24, 2012

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Masses of a fourth generation with two Higgs doublets (2012)

Leo Bellantoni, Jens Erler, Jonathan J. Heckman, and Enrique Ramirez-Homs

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-08-25

Description: Author(s): Leo Bellantoni, Jens Erler, Jonathan J. Heckman, and Enrique Ramirez-Homs We use sampling techniques to find robust constraints on the masses of a possible fourth sequential fermion generation from electroweak oblique variables. We find that in the case of a light (115 GeV) Higgs from a single electroweak symmetry breaking doublet, inverted mass hierarchies are possible f... [Phys. Rev. D 86, 034022] Published Fri Aug 24, 2012

Keywords: Strong interactions & Lattice methods

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Lattice baryons in the 1/N expansion (2012)

Thomas De; Grand

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-08-31

Description: Author(s): Thomas DeGrand Results are presented for hadron spectroscopy with gauge groups S U ( N ) with N =3, 5, 7. Calculations use the quenched approximation. Lattice spacings are matched using the static potential. Meson spectra show independence on N and vacuum-to-hadron matrix elements scale as √ N . The baryon spectrum shows... [Phys. Rev. D 86, 034508] Published Thu Aug 30, 2012

Keywords: Strong interactions & Lattice methods

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Top quark and leptonic charge asymmetries for the Tevatron and LHC (2012)

Werner Bernreuther and Zong-Guo Si

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-08-25

Description: Author(s): Werner Bernreuther and Zong-Guo Si We compute, for t t ̅ production at the LHC and at the Tevatron, several charge asymmetries to next-to-leading order QCD, including also the electromagnetic and weak-interaction corrections. We calculate these asymmetries both inclusively and with additional kinematic cuts and compare our resu... [Phys. Rev. D 86, 034026] Published Fri Aug 24, 2012

Keywords: Strong interactions & Lattice methods

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98

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Chiral symmetry restoration and deconfinement in QCD at finite temperature (2012)

C. A. Dominguez, M. Loewe, and Y. Zhang

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-08-30

Description: Author(s): C. A. Dominguez, M. Loewe, and Y. Zhang The light-quark correlator in the axial-vector channel is used, in conjunction with finite energy QCD sum rules at finite temperature, in order to (a) establish a relation between chiral-symmetry restoration and deconfinement, and (b) determine the temperature behavior of the a 1 (1260) width and coup... [Phys. Rev. D 86, 034030] Published Wed Aug 29, 2012

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New mechanism for generating a single transverse spin asymmetry (2012)

Yuri V. Kovchegov and Matthew D. Sievert

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-08-30

Description: Author(s): Yuri V. Kovchegov and Matthew D. Sievert We propose a new mechanism for generating a single transverse spin asymmetry (STSA) in polarized proton-proton and proton-nucleus collisions in the high-energy scattering approximation. In this framework the STSA originates from the q → q G splitting in the projectile (proton) light-cone wave function ... [Phys. Rev. D 86, 034028] Published Wed Aug 29, 2012

Keywords: Strong interactions & Lattice methods

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100

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Holographic models and the QCD trace anomaly (2012)

J. L. Goity and R. C. Trinchero

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-08-31

Description: Author(s): J. L. Goity and R. C. Trinchero Five-dimensional dilaton models are considered as possible holographic duals of the pure gauge QCD vacuum. In the framework of these models, the QCD trace anomaly equation is considered. Each quantity appearing in that equation is computed by holographic means. Two exact solutions for different dila... [Phys. Rev. D 86, 034033] Published Thu Aug 30, 2012

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