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Near the sill of the conformal window: Gauge theories with fermions in two-index representations (2013)

Thomas De; Grand, Yigal Shamir, and Benjamin Svetitsky

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2013-09-17

Description: Author(s): Thomas DeGrand, Yigal Shamir, and Benjamin Svetitsky We apply Schrödinger functional methods to two gauge theories with fermions in two-index representations: the SU(3) theory with N f =2 adjoint fermions, and the SU(4) theory with N f =6 fermions in the two-index antisymmetric representation. Each theory is believed to lie near the bottom of the conforma... [Phys. Rev. D 88, 054505] Published Mon Sep 16, 2013

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Monte Carlo simulations on the Lefschetz thimble: Taming the sign problem (2013)

Marco Cristoforetti, Francesco Di Renzo, Abhishek Mukherjee, and Luigi Scorzato

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2013-09-17

Description: Author(s): Marco Cristoforetti, Francesco Di Renzo, Abhishek Mukherjee, and Luigi Scorzato We present the first practical Monte Carlo calculations of the recently proposed Lefschetz thimble formulation of quantum field theories. Our results provide strong evidence that the numerical sign problem that afflicts Monte Carlo calculations of models with complex actions can be softened signific... [Phys. Rev. D 88, 051501] Published Mon Sep 16, 2013

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Nucleon mass and pion-nucleon sigma term from a chiral analysis of lattice QCD data (2013)

L. Alvarez-Ruso, T. Ledwig, J. Martin Camalich, and M. J. Vicente-Vacas

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2013-09-21

Description: Author(s): L. Alvarez-Ruso, T. Ledwig, J. Martin Camalich, and M. J. Vicente-Vacas The pion mass dependence of the nucleon mass within the covariant S U (2) baryon chiral perturbation theory both without and with explicit Δ (1232) degrees of freedom up to order p 4 is investigated. By fitting to a comprehensive set of lattice QCD data in 2 and 2+1 flavors from several collaborations, ... [Phys. Rev. D 88, 054507] Published Fri Sep 20, 2013

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Dissociation of quarkonium in an anisotropic hot QCD medium (2013)

Lata Thakur, Najmul Haque, Uttam Kakade, and Binoy Krishna Patra

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2013-09-24

Description: Author(s): Lata Thakur, Najmul Haque, Uttam Kakade, and Binoy Krishna Patra We have studied the properties of quarkonium states in the presence of momentum anisotropy by correcting the full Cornell potential through the hard-loop resumed gluon propagator. The in-medium modification to the potential causes less screening, so quarkonium states become more tightly bound than i... [Phys. Rev. D 88, 054022] Published Mon Sep 23, 2013

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Metropolis Monte Carlo integration on the Lefschetz thimble: Application to a one-plaquette model (2013)

Abhishek Mukherjee, Marco Cristoforetti, and Luigi Scorzato

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2013-09-27

Description: Author(s): Abhishek Mukherjee, Marco Cristoforetti, and Luigi Scorzato We propose a new algorithm based on the Metropolis sampling method to perform Monte Carlo integration for path integrals in the recently proposed formulation of quantum field theories on the Lefschetz thimble. The algorithm is based on a mapping between the curved manifold defined by the Lefschetz t... [Phys. Rev. D 88, 051502] Published Thu Sep 26, 2013

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Hadroproduction of Υ(nS) above the BB[over ¯] thresholds and implications for Y_{b}(10890) (2013)

Ahmed Ali, Christian Hambrock, and Wei Wang

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2013-09-27

Description: Author(s): Ahmed Ali, Christian Hambrock, and Wei Wang Based on the nonrelativistic QCD factorization scheme, we study the hadroproduction of the bottomonium states Υ (5 S ) and Υ (6 S ). We argue to search for them in the final states Υ (1 S ,2 S ,3 S ) π + π - , which are found to have anomalously large production rates at Υ (5 S ). The enhanced rates for the dipionic tra... [Phys. Rev. D 88, 054026] Published Thu Sep 26, 2013

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Generalized universality of definite rank gluon transverse momentum dependent correlators (2013)

M. G. A. Buffing, A. Mukherjee, and P. J. Mulders

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2013-09-27

Description: Author(s): M. G. A. Buffing, A. Mukherjee, and P. J. Mulders Transverse momentum dependent (TMD) parton correlators describing the partonic structure of hadrons contain gauge links, required by color gauge invariance. The required gauge links enter in the matrix elements that contain the parton fields and depend on the color flow in the hard process. The corr... [Phys. Rev. D 88, 054027] Published Thu Sep 26, 2013

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Rare decay B→Kℓ^{+}ℓ^{-} form factors from lattice QCD (2013)

Chris Bouchard, G. Peter Lepage, Christopher Monahan, Heechang Na, and Junko Shigemitsu (HPQCD Collaboration)

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2013-09-27

Description: Author(s): Chris Bouchard, G. Peter Lepage, Christopher Monahan, Heechang Na, and Junko Shigemitsu (HPQCD Collaboration) We calculate, for the first time using unquenched lattice QCD, form factors for the rare decay B → K ℓ + ℓ - in and beyond the Standard Model. Our lattice QCD calculation utilizes a nonrelativistic QCD formulation for the b valence quarks and the highly improved staggered quark formulation for the light v... [Phys. Rev. D 88, 054509] Published Thu Sep 26, 2013

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Threshold resummed and approximate next-to-next-to-leading order results for W^{+}W^{-} pair production at the LHC (2013)

S. Dawson, Ian M. Lewis, and Mao Zeng

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2013-09-27

Description: Author(s): S. Dawson, Ian M. Lewis, and Mao Zeng The next-to-leading order (NLO) QCD radiative corrections to W + W - production at hadron colliders are well understood. We combine NLO perturbative QCD calculations with soft-gluon resummation of threshold logarithms to find a next-to-next-to-leading logarithmic (NNLL) prediction for the total cross s... [Phys. Rev. D 88, 054028] Published Thu Sep 26, 2013

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Higgs and W boson spectrum from lattice simulations (2013)

Mark Wurtz and Randy Lewis

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2013-09-27

Description: Author(s): Mark Wurtz and Randy Lewis The spectrum of energy levels is computed for all available angular momentum and parity quantum numbers in the SU(2)-Higgs model, with parameters chosen to match experimental data from the Higgs- W boson sector of the standard model. Several multiboson states are observed, with and without linear mom... [Phys. Rev. D 88, 054510] Published Thu Sep 26, 2013

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Color octet potential to three loops (2013)

Chihaya Anzai, Mario Prausa, Alexander V. Smirnov, Vladimir A. Smirnov, and Matthias Steinhauser

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2013-09-28

Description: Author(s): Chihaya Anzai, Mario Prausa, Alexander V. Smirnov, Vladimir A. Smirnov, and Matthias Steinhauser We consider the interaction between two static sources in the color octet configuration and compute the potential to three loops. Special emphasis is put on the treatment of pinch contributions, and two methods are applied to reduce their evaluation to diagrams without pinches. [Phys. Rev. D 88, 054030] Published Fri Sep 27, 2013

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Doubly charmed tetraquarks in B_{c} and Ξ_{bc} decays (2013)

A. Esposito, M. Papinutto, A. Pilloni, A. D. Polosa, and N. Tantalo

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2013-09-28

Description: Author(s): A. Esposito, M. Papinutto, A. Pilloni, A. D. Polosa, and N. Tantalo The phenomenology of the so-called X , Y and Z hadronic resonances is hard to reconcile with standard charmonium or bottomonium interpretations. It has been suggested that some of these new hadrons can possibly be described as tightly bound tetraquark states and/or as loosely bound two-meson molecule... [Phys. Rev. D 88, 054029] Published Fri Sep 27, 2013

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Jet mass spectra in Higgs boson plus one jet at next-to-next-to-leading logarithmic order (2013)

Teppo T. Jouttenus, Iain W. Stewart, Frank J. Tackmann, and Wouter J. Waalewijn

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2013-10-01

Description: Author(s): Teppo T. Jouttenus, Iain W. Stewart, Frank J. Tackmann, and Wouter J. Waalewijn The invariant mass of a jet is a benchmark variable describing the structure of jets at the LHC. We calculate the jet mass spectrum for Higgs plus one jet at the LHC at next-to-next-to-leading logarithmic (NNLL) order using a factorization formula. At this order, the cross section becomes sensitive ... [Phys. Rev. D 88, 054031] Published Mon Sep 30, 2013

Keywords: Strong interactions & Lattice methods

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Effective multiquark interactions with explicit breaking of chiral symmetry (2013)

A. A. Osipov, B. Hiller, and A. H. Blin

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2013-10-01

Description: Author(s): A. A. Osipov, B. Hiller, and A. H. Blin In a long distance Lagrangian approach to the low lying meson phenomenology, we present and discuss the most general spin zero multiquark interaction vertices of nonderivative type which include a set of effective interactions proportional to the current quark masses, breaking explicitly the chiral ... [Phys. Rev. D 88, 054032] Published Mon Sep 30, 2013

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Extended study of prompt photon photoproduction at HERA with k_{T}-factorization (2013)

A. V. Lipatov, M. A. Malyshev, and N. P. Zotov

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2013-10-02

Description: Author(s): A. V. Lipatov, M. A. Malyshev, and N. P. Zotov We reconsider prompt photon photoproduction at HERA in the framework of the k T -factorization QCD approach. The proposed method is based on the O ( α 2 α s ) amplitudes for γ q → γ g q and γ g * → γ q q ̅ partonic subprocesses. Additionally, we take into account the O ( α 2 α s 2 ) box contributions γ g → γ g to the prod... [Phys. Rev. D 88, 074001] Published Tue Oct 01, 2013

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Parity-violating quantum kinetic theory in (2+1) dimensions (2013)

Jiunn-Wei Chen, Jian-Hua Gao, Juan Liu, Shi Pu, and Qun Wang

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2013-10-05

Description: Author(s): Jiunn-Wei Chen, Jian-Hua Gao, Juan Liu, Shi Pu, and Qun Wang We study the kinetic theory for a (2+1)-dimensional fermionic system with special emphasis on the parity violating properties associated with the fermion mass. The Wigner function approach is used to derive hydrodynamical transport coefficients to the first spatial derivative order. As a first attem... [Phys. Rev. D 88, 074003] Published Fri Oct 04, 2013

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Physical interpretation of the dressed Polyakov loop in the Nambu–Jona-Lasinio model (2013)

S. Benić

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2013-10-05

Description: Author(s): S. Benić We investigate the rapid rise of the dressed Polyakov loop in the Nambu–Jona-Lasinio (NJL) model as a function of temperature. In QCD such a behavior is interpreted as a confinement-deconfinement phase transition. However, we demonstrate that in the NJL model this is simply a remnant of the chiral t... [Phys. Rev. D 88, 077501] Published Fri Oct 04, 2013

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Inverse magnetic catalysis induced by sphalerons (2013)

Jingyi Chao, Pengcheng Chu, and Mei Huang

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2013-09-07

Description: Author(s): Jingyi Chao, Pengcheng Chu, and Mei Huang The recently discovered inverse magnetic catalysis around the critical temperature indicates that some important information is missing in our current understanding of conventional chiral dynamics of QCD, which is enhanced by the magnetic field. In this work, we provide a mechanism to explain that t... [Phys. Rev. D 88, 054009] Published Fri Sep 06, 2013

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Heavy-antiquark–diquark symmetry and heavy hadron molecules: Are there triply heavy pentaquarks? (2013)

Feng-Kun Guo, Carlos Hidalgo-Duque, Juan Nieves, and Manuel Pavón Valderrama

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2013-09-10

Description: Author(s): Feng-Kun Guo, Carlos Hidalgo-Duque, Juan Nieves, and Manuel Pavón Valderrama We explore the consequences of heavy flavor, heavy quark spin, and heavy antiquark-diquark symmetries for hadronic molecules within an effective field theory framework. Owing to heavy antiquark-diquark symmetry, the doubly heavy baryons have approximately the same light-quark structure as the heavy ... [Phys. Rev. D 88, 054014] Published Mon Sep 09, 2013

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Intrinsic strangeness and charm of the nucleon using improved staggered fermions (2013)

W. Freeman and D. Toussaint (MILC Collaboration)

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2013-09-10

Description: Author(s): W. Freeman and D. Toussaint (MILC Collaboration) We calculate the intrinsic strangeness of the nucleon, ⟨ N | s ̅ s | N ⟩-⟨0| s ̅ s |0⟩, using the MILC library of improved staggered gauge configurations using the Asqtad and HISQ actions. Additionally, we present a preliminary calculation of the intrinsic charm of the nucleon using the HISQ act... [Phys. Rev. D 88, 054503] Published Mon Sep 09, 2013

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Bottonium in QCD at finite temperature (2013)

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

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2013-09-13

Description: Author(s): C. A. Dominguez, M. Loewe, and Y. Zhang Vector ( Υ ) and pseudoscalar ( η b ) bottonium ground states are studied at finite temperature in the framework of thermal Hilbert moment QCD sum rules. The mass, the onset of perturbative QCD in the complex squared energy plane, s 0 , the leptonic decay constant, and the total width are determined as a f... [Phys. Rev. D 88, 054015] Published Thu Sep 12, 2013

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Inside the SU(3) quark-antiquark QCD flux tube: Screening versus quantum widening (2013)

N. Cardoso, M. Cardoso, and P. Bicudo

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2013-09-14

Description: Author(s): N. Cardoso, M. Cardoso, and P. Bicudo In lattice QCD, color confinement manifests in flux tubes. We compute in detail the quark-antiquark flux tube for pure gauge SU(3) dimension D =3+1 for quark-antiquark distances R ranging from 0.4 to 1.4 fm. To increase the signal-to-noise ratio, we apply the improved multihit and extended smearing t... [Phys. Rev. D 88, 054504] Published Fri Sep 13, 2013

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Magnetic flux loop in high-energy heavy-ion collisions (2013)

Adrian Dumitru, Yasushi Nara, and Elena Petreska

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2013-09-18

Description: Author(s): Adrian Dumitru, Yasushi Nara, and Elena Petreska We consider the expectation value of a chromomagnetic flux loop in the immediate forward light cone of collisions of heavy nuclei at high energies. Such collisions are characterized by a nonlinear scale Q s where color fields become strong. We find that loops of area greater than ∼1.5/ Q s 2 exhibit are... [Phys. Rev. D 88, 054016] Published Tue Sep 17, 2013

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Pairing fluctuation effects in a strongly coupled color superfluid/superconductor (2013)

Jinyi Pang, Jincheng Wang, and Lianyi He

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2013-09-18

Description: Author(s): Jinyi Pang, Jincheng Wang, and Lianyi He We investigate the effects of pairing fluctuations in fermionic superfluids/superconductors where pairing occurs among three species (colors) of fermions. Such color superfluids/superconductors can be realized in three-component atomic Fermi gases and in dense quark matter. The superfluidity/superco... [Phys. Rev. D 88, 054017] Published Tue Sep 17, 2013

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Time-dependent CP violations of B(B_{s}) decays in the perturbative QCD approach (2013)

Xin Yu, Zhi-Tian Zou, and Cai-Dian Lü

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2013-09-20

Description: Author(s): Xin Yu, Zhi-Tian Zou, and Cai-Dian Lü We study the decay modes of B s 0 ( B ̅ s 0 )→ D s ± K ∓ , B s 0 ( B ̅ s 0 )→ D ± π ∓ , and B 0 ( B ̅ 0 )→ D ± π ∓ in the perturbative QCD approach based on k T factorization, including the branching ratios and C P violation parameters which provide a clear way to extract the Cabibbo-Kobayashi-Maskawa angle γ . Our... [Phys. Rev. D 88, 054018] Published Thu Sep 19, 2013

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Effective potential for SU(2) Polyakov loops and Wilson loop eigenvalues (2013)

Dominik Smith, Adrian Dumitru, Robert Pisarski, and Lorenz von Smekal

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2013-09-21

Description: Author(s): Dominik Smith, Adrian Dumitru, Robert Pisarski, and Lorenz von Smekal We simulate SU(2) gauge theory at temperatures ranging from slightly below T c to roughly 2 T c for two different values of the gauge coupling. Using a histogram method, we extract the effective potential for the Polyakov loop and for the phases of the eigenvalues of the thermal Wilson loop, in both th... [Phys. Rev. D 88, 054020] Published Fri Sep 20, 2013

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Determination of pion and kaon fragmentation functions including spin asymmetries data in a global analysis (2013)

M. Soleymaninia, A. N. Khorramian, S. M. Moosavinejad, and F. Arbabifar

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2013-09-21

Description: Author(s): M. Soleymaninia, A. N. Khorramian, S. M. Moosavinejad, and F. Arbabifar We present a new functional form of pion and kaon fragmentation functions up to next-to-leading order obtained through a global fit to single-inclusive electron-positron annihilation data, and also employ the semi-inclusive deep inelastic scattering asymmetry data from HERMES and COMPASS to determin... [Phys. Rev. D 88, 054019] Published Fri Sep 20, 2013

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Kπ scattering and the K^{*} decay width from lattice QCD (2013)

Sasa Prelovsek, Luka Leskovec, C. B. Lang, and Daniel Mohler

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2013-09-26

Description: Author(s): Sasa Prelovsek, Luka Leskovec, C. B. Lang, and Daniel Mohler K * mesons and in particular the K * (892) were frequently addressed in lattice simulations, but always while ignoring that the K * (892) decays strongly. We present an exploratory extraction of the masses and widths for the K * resonances by simulating K π scattering in p waves with I =1/2 on the lattice. ... [Phys. Rev. D 88, 054508] Published Wed Sep 25, 2013

Keywords: Strong interactions & Lattice methods

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Photoproduction of top quarks in coherent hadron-hadron interactions (2013)

V. P. Gonçalves

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2013-09-26

Description: Author(s): V. P. Gonçalves In this paper we study the photoproduction of top quarks in coherent p p , p P b , and P b P b interactions at LHC energies in the collinear formalism. We present our predictions for the total cross sections, event rates, and rapidity distributions. The dependence in the parton distributions used in the cal... [Phys. Rev. D 88, 054025] Published Wed Sep 25, 2013

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Constraining the mass and width of the N^{*}(1685) resonance (2013)

T. Mart

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2013-10-01

Description: Author(s): T. Mart We have examined the existence of the N * (1685) resonance, which is recently listed by the Particle Data Group as a one-star nucleon resonance, by using a covariant isobar model for kaon photoproduction and assuming that the resonance has J p =1/2 + , in accordance with our previous finding. After the in... [Phys. Rev. D 88, 057501] Published Mon Sep 30, 2013

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Understanding the B→K^{*}μ^{+}μ^{-} anomaly (2013)

Sébastien Descotes-Genon, Joaquim Matias, and Javier Virto

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2013-10-04

Description: Author(s): Sébastien Descotes-Genon, Joaquim Matias, and Javier Virto We present a global analysis of the B → K * (→ K π ) μ + μ - decay using the recent LHCb measurements of the primary observables P 1,2 and P 4,5,6,8 ′ . Some of them exhibit large deviations with respect to the Standard Model (SM) predictions. We explain the observed pattern of deviations through a large new physi... [Phys. Rev. D 88, 074002] Published Thu Oct 03, 2013

Keywords: Strong interactions & Lattice methods

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Direct connection between the different QCD orders for parton distribution and fragmentation functions (2013)

O. Yu. Shevchenko

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2013-06-06

Description: Author(s): O. Yu. Shevchenko The formulas directly connecting parton distribution functions and fragmentation functions at the next-to-leading-order QCD with the same quantities at the leading order are derived. These formulas are universal, i.e., have the same form for all kinds of parton distribution functions and fragmentati... [Phys. Rev. D 87, 114004] Published Wed Jun 05, 2013

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Heavy quarkonium moving in a quark-gluon plasma (2013)

Miguel Angel Escobedo, Floriana Giannuzzi, Massimo Mannarelli, and Joan Soto

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2013-06-06

Description: Author(s): Miguel Angel Escobedo, Floriana Giannuzzi, Massimo Mannarelli, and Joan Soto By means of effective field theory techniques, we study the modifications of some properties of weakly coupled heavy quarkonium states propagating through a quark-gluon plasma at temperatures much smaller than the heavy quark mass, m Q . Two different cases are considered, corresponding to two differe... [Phys. Rev. D 87, 114005] Published Wed Jun 05, 2013

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Single top production in association with a Z boson at the LHC (2013)

John Campbell, R. Keith Ellis, and Raoul Röntsch

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2013-06-06

Description: Author(s): John Campbell, R. Keith Ellis, and Raoul Röntsch We present results for the production of a Z boson in association with single top at next-to-leading order (NLO), including the decay of the top quark and the Z boson. This electroweak process gives rise to the trilepton signature l + l - l ′± +jets+missing energy. We present results for this signature an... [Phys. Rev. D 87, 114006] Published Wed Jun 05, 2013

Keywords: Strong interactions & Lattice methods

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Tsallis fits to p_{T} spectra and multiple hard scattering in pp collisions at the LHC (2013)

Cheuk-Yin Wong and Grzegorz Wilk

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2013-06-06

Description: Author(s): Cheuk-Yin Wong and Grzegorz Wilk Phenomenological Tsallis fits to the CMS, ATLAS, and ALICE transverse momentum spectra of hadrons for p p collisions at LHC were recently found to extend over a large range of the transverse momentum. We investigate whether the few degrees of freedom in the Tsallis parametrization may arise from the ... [Phys. Rev. D 87, 114007] Published Wed Jun 05, 2013

Keywords: Strong interactions & Lattice methods

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Phase diagram of the quantum O(2) model in 2+1 dimensions (2013)

Kurt Langfeld

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2013-06-06

Description: Author(s): Kurt Langfeld The quantum O (2) model in 2+1 dimensions is studied by simulating the 3D O (2) model near criticality. Finite densities are introduced by a nonzero chemical potential μ , and the worm algorithm is used to circumvent the sign problem. The renormalization is discussed in some detail. We find that the on... [Phys. Rev. D 87, 114504] Published Wed Jun 05, 2013

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Shear viscosity of quark matter at finite temperature under an external magnetic field (2013)

Seung-il Nam and Chung-Wen Kao

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2013-06-06

Description: Author(s): Seung-il Nam and Chung-Wen Kao We employ the diluted instanton liquid model and the Green-Kubo formula to investigate the shear viscosity of the SU(2) light-flavor quark matter at finite temperature under an external strong magnetic field e | B |∼ m π 2 . We apply the Schwinger method to calculate the effect of the external magnetic fie... [Phys. Rev. D 87, 114003] Published Wed Jun 05, 2013

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Formulation of domain-wall fermions in the Schrödinger functional (2013)

Shinji Takeda

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2013-06-12

Description: Author(s): Shinji Takeda We present a formulation of domain-wall fermions in the Schrödinger functional by following a universality argument. To examine the formulation, we numerically investigate the spectrum of the free operator and perform a one-loop analysis to confirm universality and renormalizability. We also study t... [Phys. Rev. D 87, 114506] Published Tue Jun 11, 2013

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Heavy quarkonium production through the semi-exclusive e^{+}e^{-} annihilation channels round the Z^{0} peak (2013)

Zhan Sun, Xing-Gang Wu, Gu Chen, Jun Jiang, and Zhi Yang

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2013-06-07

Description: Author(s): Zhan Sun, Xing-Gang Wu, Gu Chen, Jun Jiang, and Zhi Yang Within the framework of the nonrelativistic quantum chromodynamics, we present a detailed discussion on the heavy quarkonium production at the leading order in α s at a e + e - collider with the collision energy around the Z 0 peak. Quarkonia are produced through the semi-exclusive channels e + e - →| H Q Q ̅ ... [Phys. Rev. D 87, 114008] Published Thu Jun 06, 2013

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Leading isospin breaking effects on the lattice (2013)

G. M. de Divitiis, R. Frezzotti, V. Lubicz, G. Martinelli, R. Petronzio, G. C. Rossi, F. Sanfilippo, S. Simula, and N. Tantalo (RM123 Collaboration)

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2013-06-08

Description: Author(s): G. M. de Divitiis, R. Frezzotti, V. Lubicz, G. Martinelli, R. Petronzio, G. C. Rossi, F. Sanfilippo, S. Simula, and N. Tantalo (RM123 Collaboration) We present a method to evaluate on the lattice the leading isospin breaking effects due to both the small mass difference between the up and down quarks and the QED interaction. Our proposal is applicable in principle to any QCD+QED gauge invariant hadronic observable that can be computed on the lat... [Phys. Rev. D 87, 114505] Published Fri Jun 07, 2013

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B decays into radially excited charmed mesons (2013)

J. Segovia, E. Hernández, F. Fernández, and D. R. Entem

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2013-06-11

Description: Author(s): J. Segovia, E. Hernández, F. Fernández, and D. R. Entem It has been recently argued that some longstanding problems in semileptonic B decays can be solved provided the branching ratio for the B → D ′(*) semileptonic decays are large enough. We have studied these decays in a constituent quark model, which has been successful in describing semileptonic and no... [Phys. Rev. D 87, 114009] Published Mon Jun 10, 2013

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Tensor meson photoproduction as a final state interaction effect (2013)

Łukasz Bibrzycki and Robert Kamiński

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2013-06-12

Description: Author(s): Łukasz Bibrzycki and Robert Kamiński The model is presented to describe the f 2 (1270) meson photoproduction as a result of pion-pion interactions in the final state. Treating tensor mesons as objects dynamically created due to final state interactions is a convenient and straightforward way to employ data from π π scattering like phase s... [Phys. Rev. D 87, 114010] Published Tue Jun 11, 2013

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Shift in weak phase γ due to CP asymmetries in D decays to two pseudoscalar mesons (2013)

Bhubanjyoti Bhattacharya, Michael Gronau, David London, and Jonathan L. Rosner

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2013-04-03

Description: Author(s): Bhubanjyoti Bhattacharya, Michael Gronau, David London, and Jonathan L. Rosner A difference of several tenths of a percent has been observed between the direct C P asymmetries of D 0 → K + K - and D 0 → π + π - . It has been noted recently that C P asymmetries in such singly Cabibbo-suppressed decays can affect the determination of the weak phase γ using the Gronau-London-Wyler method of com... [Phys. Rev. D 87, 074002] Published Tue Apr 02, 2013

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Collider searches for dark matter in events with a Z boson and missing energy (2013)

Linda M. Carpenter, Andrew Nelson, Chase Shimmin, Tim M. P. Tait, and Daniel Whiteson

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2013-04-06

Description: Author(s): Linda M. Carpenter, Andrew Nelson, Chase Shimmin, Tim M. P. Tait, and Daniel Whiteson Searches for dark matter at colliders typically involve signatures with energetic initial-state radiation without visible recoil particles. Searches for monojet or monophoton signatures have yielded powerful constraints on dark matter interactions with Standard Model particles. We extend this to the... [Phys. Rev. D 87, 074005] Published Fri Apr 05, 2013

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Λ_{b}→Λℓ^{+}ℓ^{-} form factors and differential branching fraction from lattice QCD (2013)

William Detmold, C.-J. David Lin, Stefan Meinel, and Matthew Wingate

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2013-04-06

Description: Author(s): William Detmold, C.-J. David Lin, Stefan Meinel, and Matthew Wingate We present the first lattice QCD determination of the Λ b → Λ transition form factors that govern the rare baryonic decays Λ b → Λ ℓ + ℓ - at leading order in heavy-quark effective theory. Our calculations are performed with 2+1 flavors of domain-wall fermions, at two lattice spacings and with pion masses dow... [Phys. Rev. D 87, 074502] Published Fri Apr 05, 2013

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Identifying the boosted hadronically decaying top quark using jet substructure in its center-of-mass frame (2013)

Chunhui Chen

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2013-04-09

Description: Author(s): Chunhui Chen In this paper we study the identification of the boosted hadronically decaying top quarks using jet substructure in the center-of-mass frame of the jet. We demonstrate that the method can greatly reduce the QCD jet background while maintaining high identification efficiency of the boosted top quark ... [Phys. Rev. D 87, 074007] Published Mon Apr 08, 2013

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Study of e^{+}e^{-}→ωπ^{0}→π^{0}π^{0}γ in the energy range 1.05–2.00 GeV with the SND detector (2013)

M. N. Achasov et al.

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2013-09-10

Description: Author(s): M. N. Achasov et al. The cross section for the process e + e - → ω π 0 → π 0 π 0 γ has been measured in the center-of-mass energy range 1.05–2.00 GeV. The experiment has been performed at the e + e - collider VEPP-2000 with the SND detector. The measured e + e - → ω π 0 cross section above 1.4 GeV is the most accurate to date. Below 1.4 GeV o... [Phys. Rev. D 88, 054013] Published Mon Sep 09, 2013

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K^{*}Σ photoproduction off the proton target with baryon resonances (2013)

Sang-Ho Kim, Seung-il Nam, Atsushi Hosaka, and Hyun-Chul Kim

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2013-09-10

Description: Author(s): Sang-Ho Kim, Seung-il Nam, Atsushi Hosaka, and Hyun-Chul Kim We investigate the photoproduction of K *0 Σ + and K *+ Σ 0 off the proton target, employing the effective Lagrangian approach at the tree-level Born approximation. In addition to the ( s , t , u )-channel Born diagrams, we take into account various baryon-resonance contributions such as D 13 (2080), S 11 (2090), G ... [Phys. Rev. D 88, 054012] Published Mon Sep 09, 2013

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Multiple scattering effects on inclusive particle production in the large-x regime (2013)

Zhong-Bo Kang, Ivan Vitev, and Hongxi Xing

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2013-09-10

Description: Author(s): Zhong-Bo Kang, Ivan Vitev, and Hongxi Xing We study the multiple scattering effects on inclusive particle production in p+A and γ +A collisions. Specifically, we concentrate on the region where the parton momentum fraction in the nucleus x ∼ O (1) and incoherent multiple interactions are relevant. By taking into account both initial-state and fi... [Phys. Rev. D 88, 054010] Published Mon Sep 09, 2013

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Next-to-next-to-leading order nonresonant corrections to threshold top-pair production from e^{+}e^{-} collisions: Endpoint-singular terms (2013)

B. Jantzen and P. Ruiz-Femenía

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2013-09-10

Description: Author(s): B. Jantzen and P. Ruiz-Femenía We analyze the subleading nonresonant contributions to the e + e - → W + W - b b ̅ cross section at energies near the top-antitop threshold. These correspond to next-to-next-to-leading-order (NNLO) corrections with respect to the leading-order resonant result. We show that these corrections produce 1/ ϵ ... [Phys. Rev. D 88, 054011] Published Mon Sep 09, 2013

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Nonperturbative renormalization for improved staggered bilinears (2013)

Andrew T. Lytle and Stephen R. Sharpe

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2013-09-17

Description: Author(s): Andrew T. Lytle and Stephen R. Sharpe We apply nonperturbative renormalization to bilinears composed of improved staggered fermions. We explain how to generalize the method to staggered fermions in a way that is consistent with the lattice symmetries and introduce a new type of lattice bilinear that transforms covariantly and avoids mix... [Phys. Rev. D 88, 054506] Published Mon Sep 16, 2013

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Sivers effect and the single spin asymmetry A_{N} in p^{↑}p→hX processes (2013)

M. Anselmino, M. Boglione, U. D’Alesio, S. Melis, F. Murgia, and A. Prokudin

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2013-09-24

Description: Author(s): M. Anselmino, M. Boglione, U. D’Alesio, S. Melis, F. Murgia, and A. Prokudin The single spin asymmetry A N , for large P T single inclusive particle production in p ↑ p collisions, is considered within a generalized parton model and a transverse momentum dependent factorization scheme. The focus is on the Sivers effect and the study of its potential contribution to A N , based on a... [Phys. Rev. D 88, 054023] Published Mon Sep 23, 2013

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Higgs-boson production in association with three jets via gluon fusion at the LHC: Gluonic contributions (2013)

Francisco Campanario and Michael Kubocz

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2013-09-24

Description: Author(s): Francisco Campanario and Michael Kubocz Higgs production in association with three jets via gluon fusion is an important channel for the measurement of the C P properties of the Higgs particle at the LHC. In this paper, we go beyond the heavy top effective theory approximation and include at LO the full mass dependence of the top- and bott... [Phys. Rev. D 88, 054021] Published Mon Sep 23, 2013

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Constraining the Higgs boson width with ZZ production at the LHC (2013)

Fabrizio Caola and Kirill Melnikov

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2013-09-25

Description: Author(s): Fabrizio Caola and Kirill Melnikov We point out that existing measurements of p p → Z Z cross sections at the LHC in a broad range of Z Z invariant masses allow one to derive a model-independent upper bound on the Higgs boson width, thanks to a strongly enhanced off-shell Higgs contribution. Using CMS data and considering events in the in... [Phys. Rev. D 88, 054024] Published Tue Sep 24, 2013

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Charmonium resonances in e^{+}e^{-} exclusive reactions around the ψ(4415) region (2011)

J. Segovia, D. R. Entem, and F. Fernández

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2011-06-09

Description: Author(s): J. Segovia, D. R. Entem, and F. Fernández The Belle Collaboration has reported measurements of the exclusive cross section for the processes e + e - → D 0 D - π + and e + e - → D 0 D *- π + over the center-of-mass energy range 4.0 GeV to 5.0 GeV. The resonant structure of the cross section suggests that the reactions go through the ψ (4415) resonance. We study ... [Phys. Rev. D 83, 114018] Published Wed Jun 08, 2011

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QCD corrections to Υ production via color-octet states at the Tevatron and LHC (2011)

Bin Gong, Jian-Xiong Wang, and Hong-Fei Zhang

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2011-06-10

Description: Author(s): Bin Gong, Jian-Xiong Wang, and Hong-Fei Zhang The next-to-leading order QCD corrections to Υ production via S -wave color-octet states Υ [ 1 S 0 (8) , 3 S 1 (8) ] at the Tevatron and LHC is calculated. The K factors of total cross section (ratio of next-to-leading order to leading order) are 1.313 and 1.379 for Υ [ 1 S 0 (8) ] and Υ [ 3 S 1 (8) ] at the Tevatron, whil... [Phys. Rev. D 83, 114021] Published Thu Jun 09, 2011

Keywords: Strong interactions & Lattice methods

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A phenomenological study of single transverse-spin asymmetry for inclusive light-hadron productions at RHIC (2011)

Koichi Kanazawa and Yuji Koike

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2011-06-10

Description: Author(s): Koichi Kanazawa and Yuji Koike We study the single transverse-spin asymmetry for inclusive light-hadron productions in the proton-proton collision, p ↑ p → h X ( h = π , K , η ), for the RHIC kinematics based on the twist-3 mechanism in the collinear factorization. The analysis includes all the contributions from the soft-gluon pole and the... [Phys. Rev. D 83, 114024] Published Thu Jun 09, 2011

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QCD radiative corrections to χ_{cJ} production at hadron colliders (2011)

Yan-Qing Ma, Kai Wang, and Kuang-Ta Chao

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2011-06-11

Description: Author(s): Yan-Qing Ma, Kai Wang, and Kuang-Ta Chao To clarify the outstanding problem in charmonium production that existing theories cannot explain the observed cross sections of χ c J ( J =0,1,2) and ratio R χ c = σ χ c 2 / σ χ c 1 ≈0.75 (in contrast to the spin counting value 5/3 ) at the Tevatron, we study the complete next-to-leading order radiative corrections i... [Phys. Rev. D 83, 111503] Published Fri Jun 10, 2011

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Chiral properties of strong interactions in a magnetic background (2011)

Massimo D’Elia and Francesco Negro

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2011-06-15

Description: Author(s): Massimo D’Elia and Francesco Negro We investigate the chiral properties of QCD in the presence of a magnetic background field and in the low temperature regime, by lattice numerical simulations of N f =2 QCD. We adopt a standard staggered discretization, with a pion mass around 200 MeV, and explore a range of magnetic fields (180 MeV) ... [Phys. Rev. D 83, 114028] Published Tue Jun 14, 2011

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Momentum distribution of J/ψ in B decays (2011)

T. J. Burns, F. Piccinini, A. D. Polosa, V. Prosperi, and C. Sabelli

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2011-06-15

Description: Author(s): T. J. Burns, F. Piccinini, A. D. Polosa, V. Prosperi, and C. Sabelli The discrepancy between theory and data in the momentum distribution of slow J / ψ in B decays has been several times addressed as a puzzle. Using the most recent results on exclusive B decays into J / ψ and heavy kaons or exotic mesons and reconsidering the non-relativistic-QCD calculation of the color... [Phys. Rev. D 83, 114029] Published Tue Jun 14, 2011

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Searches for the t^{′} of a fourth family (2011)

Bob Holdom and Qi-Shu Yan

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2011-06-15

Description: Author(s): Bob Holdom and Qi-Shu Yan We study the detection of the t ′ of a fourth family during the early running of LHC with 7 TeV collision energy and 1 fb -1 integrated luminosity. By the use of a neural network we show that it is feasible to search for the t ′ even with a mass close to the unitarity upper bound, which is in the 500 ... [Phys. Rev. D 83, 114031] Published Tue Jun 14, 2011

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Central exclusive quark-antiquark dijet and standard model Higgs boson production in proton-(anti)proton collisions (2011)

Rafał Maciuła, Roman Pasechnik, and Antoni Szczurek

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2011-06-18

Description: Author(s): Rafał Maciuła, Roman Pasechnik, and Antoni Szczurek We consider the central exclusive production of q q ̅ pairs and Higgs boson in proton-proton collisions at LHC. The amplitude for the process is derived within the k ⊥ -factorization approach and considered in different kinematical asymptotics, in particular, in the important high quark transver... [Phys. Rev. D 83, 114034] Published Fri Jun 17, 2011

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Revisiting scaling properties of medium-induced gluon radiation (2011)

François Arleo, Stéphane Peigné, and Taklit Sami

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2011-06-21

Description: Author(s): François Arleo, Stéphane Peigné, and Taklit Sami Discussing the general case of a hard partonic production process, we show that the notion of parton energy loss is not always sufficient to fully address medium-induced gluon radiation. The broader notion of gluon radiation associated with a hard process has to be used, in particular, when initial ... [Phys. Rev. D 83, 114036] Published Mon Jun 20, 2011

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Composite and elementary natures of a_{1}(1260) meson (2011)

Hideko Nagahiro, Kanabu Nawa, Sho Ozaki, Daisuke Jido, and Atsushi Hosaka

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2011-06-21

Description: Author(s): Hideko Nagahiro, Kanabu Nawa, Sho Ozaki, Daisuke Jido, and Atsushi Hosaka We develop a practical method to analyze the mixing structure of hadrons consisting of two components of quark composite and hadronic composite. As an example, we investigate the properties of the axial vector meson a 1 (1260) and discuss its mixing properties quantitatively. We also make reference to... [Phys. Rev. D 83, 111504] Published Mon Jun 20, 2011

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O(α_{s}v^{2}) corrections to hadronic and electromagnetic decays of ^{1}S_{0} heavy quarkonium (2011)

Huai-Ke Guo, Yan-Qing Ma, and Kuang-Ta Chao

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2011-06-22

Description: Author(s): Huai-Ke Guo, Yan-Qing Ma, and Kuang-Ta Chao We study O ( α s v 2 ) corrections to decays of 1 S 0 heavy quarkonium into light hadrons and two photons within the framework of nonrelativistic QCD and find these O ( α s v 2 ) corrections to have significant contributions especially for the decay into light hadrons. With these new results, experimental measure... [Phys. Rev. D 83, 114038] Published Tue Jun 21, 2011

Keywords: Strong interactions & Lattice methods

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Next-to-leading order QCD corrections for W^{+}W^{-} pair production in association with two jets at hadron colliders (2011)

Tom Melia, Kirill Melnikov, Raoul Röntsch, and Giulia Zanderighi

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2011-06-23

Description: Author(s): Tom Melia, Kirill Melnikov, Raoul Röntsch, and Giulia Zanderighi We compute the NLO QCD corrections to the pair production of W -bosons in association with two jets at the Tevatron and the LHC. This process is an important background to heavy Higgs-boson production in association with two jets, either in gluon or weak boson fusion. We consider leptonic decays of W ... [Phys. Rev. D 83, 114043] Published Wed Jun 22, 2011

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Vector meson-baryon dynamics and generation of resonances (2011)

K. P. Khemchandani, H. Kaneko, H. Nagahiro, and A. Hosaka

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2011-06-23

Description: Author(s): K. P. Khemchandani, H. Kaneko, H. Nagahiro, and A. Hosaka The purpose of this work is to study vector meson-octet baryon interactions with the aim to find dynamical generation of resonances in such systems. For this, we consider s -, t -, u -channel diagrams along with a contact interaction originating from the hidden local symmetry Lagrangian. We find the co... [Phys. Rev. D 83, 114041] Published Wed Jun 22, 2011

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Fourth-generation quark mass limits in CKM-element space (2011)

Christian J. Flacco, Daniel Whiteson, and Matthew Kelly

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2011-06-28

Description: Author(s): Christian J. Flacco, Daniel Whiteson, and Matthew Kelly We present a reanalysis of CDF data to extend limits on individual fourth-generation quark masses from particular flavor-mixing rates to the entire space of possible mixing values. Measurements from CDF have set individual limits on masses, m b ′ and m t ′ , at the level of 335–385 GeV assuming specific ... [Phys. Rev. D 83, 114048] Published Mon Jun 27, 2011

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Relating B_{s} mixing and B_{s}→μ^{+}μ^{-} with new physics (2011)

Eugene Golowich, Jo; Anne Hewett, Sandip Pakvasa, Alexey A. Petrov, and Gagik K. Yeghiyan

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2011-06-08

Description: Author(s): Eugene Golowich, JoAnne Hewett, Sandip Pakvasa, Alexey A. Petrov, and Gagik K. Yeghiyan We perform a study of the standard model fit to the mixing quantities Δ M B s , and Δ Γ B s / Δ M B s in order to bound contributions of new physics (NP) to B s mixing. We then use this to explore the branching fraction of B s → μ + μ - in certain models of NP. In most cases, this constrains NP amplitudes for B s → μ + μ - ... [Phys. Rev. D 83, 114017] Published Tue Jun 07, 2011

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Isoscalar meson spectroscopy from lattice QCD (2011)

Jozef J. Dudek, Robert G. Edwards, Bálint Joó, Michael J. Peardon, David G. Richards, and Christopher E. Thomas (Hadron Spectrum Collaboration)

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2011-06-08

Description: Author(s): Jozef J. Dudek, Robert G. Edwards, Bálint Joó, Michael J. Peardon, David G. Richards, and Christopher E. Thomas (Hadron Spectrum Collaboration) We extract to high statistical precision an excited spectrum of single-particle isoscalar mesons using lattice QCD, including states of high spin and, for the first time, light exotic J PC isoscalars. The use of a novel quark field construction has enabled us to overcome the long-standing challenge o... [Phys. Rev. D 83, 111502] Published Tue Jun 07, 2011

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Non-Abelian dual superconductor picture for quark confinement (2011)

Kei-Ichi Kondo, Akihiro Shibata, Toru Shinohara, and Seikou Kato

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2011-06-08

Description: Author(s): Kei-Ichi Kondo, Akihiro Shibata, Toru Shinohara, and Seikou Kato We give a theoretical framework for defining and extracting non-Abelian magnetic monopoles in a gauge-invariant way in S U ( N ) Yang-Mills theory to study quark confinement. Then we give numerical evidences that the non-Abelian magnetic monopole defined in this way gives a dominant contribution to conf... [Phys. Rev. D 83, 114016] Published Tue Jun 07, 2011

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Top quark polarization as a probe of models with extra gauge bosons (2011)

Edmond L. Berger, Qing-Hong Cao, Chuan-Ren Chen, and Hao Zhang

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2011-06-14

Description: Author(s): Edmond L. Berger, Qing-Hong Cao, Chuan-Ren Chen, and Hao Zhang New heavy gauge bosons exist in many models of new physics beyond the standard model of particle physics. Discovery of these W ′ and Z ′ resonances and the establishment of their spins, couplings, and other quantum numbers would shed light on the gauge structure of the new physics. The measurement of ... [Phys. Rev. D 83, 114026] Published Mon Jun 13, 2011

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On models of new physics for the Tevatron top A_{FB} (2011)

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

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2011-06-14

Description: Author(s): Moira I. Gresham, Ian-Woo Kim, and Kathryn M. Zurek The Collider Detector at Fermilab (CDF) has observed a top forward-backward asymmetry discrepant with the standard model prediction at 3.4 σ . We analyze models that could generate the asymmetry, including flavor-violating W ′ s, horizontal Z H ′ s, triplet and sextet diquarks, and axigluons. We consider t... [Phys. Rev. D 83, 114027] Published Mon Jun 13, 2011

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Imaginary chemical potential approach for the pseudocritical line in the QCD phase diagram with clover-improved Wilson fermions (2011)

Keitaro Nagata and Atsushi Nakamura

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2011-06-14

Description: Author(s): Keitaro Nagata and Atsushi Nakamura The QCD phase diagram is studied in the lattice QCD simulation with the imaginary chemical potential approach. We employ a clover-improved Wilson fermion action of two flavors and a renormalization-group improved gauge action and perform the simulation at an intermediate quark mass on a 8 3 ×4 lattice... [Phys. Rev. D 83, 114507] Published Mon Jun 13, 2011

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Soft function for exclusive N-jet production at hadron colliders (2011)

Teppo T. Jouttenus, Iain W. Stewart, Frank J. Tackmann, and Wouter J. Waalewijn

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2011-06-15

Description: Author(s): Teppo T. Jouttenus, Iain W. Stewart, Frank J. Tackmann, and Wouter J. Waalewijn The N -jettiness event shape divides phase space into N +2 regions, each containing one jet or beam. Using a geometric measure, these regions correspond to jets with circular boundaries. We give a factorization theorem for the cross section fully differential in the mass of each jet, and compute the c... [Phys. Rev. D 83, 114030] Published Tue Jun 14, 2011

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Wγγ production with leptonic decays at next-to-leading order QCD (2011)

G. Bozzi, F. Campanario, M. Rauch, and D. Zeppenfeld

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2011-06-21

Description: Author(s): G. Bozzi, F. Campanario, M. Rauch, and D. Zeppenfeld The computation of the O ( α s ) QCD corrections to the cross sections for W ± γ γ production in hadronic collisions is presented. We consider the case of real photons in the final state, but include full leptonic decays of the W . Numerical results for the LHC and the Tevatron are obtained through a parton... [Phys. Rev. D 83, 114035] Published Mon Jun 20, 2011

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χ_{cJ} production associated with a cc[over ¯] pair at hadron colliders (2011)

Dan Li, Yan-Qing Ma, and Kuang-Ta Chao

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2011-06-21

Description: Author(s): Dan Li, Yan-Qing Ma, and Kuang-Ta Chao χ c J ( J =0 , 1, 2) production associated with a charm quark pair in hadron collisions is calculated in the framework of nonrelativistic QCD at the Tevatron and LHC. It is found that the color-singlet contribution is small and the color-octet contribution may be dominant in the large p T region. The diff... [Phys. Rev. D 83, 114037] Published Mon Jun 20, 2011

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Moments of nucleon generalized parton distributions from lattice QCD (2011)

C. Alexandrou, J. Carbonell, M. Constantinou, P. A. Harraud, P. Guichon, K. Jansen, C. Kallidonis, T. Korzec, and M. Papinutto

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2011-06-22

Description: Author(s): C. Alexandrou, J. Carbonell, M. Constantinou, P. A. Harraud, P. Guichon, K. Jansen, C. Kallidonis, T. Korzec, and M. Papinutto We present results on the lower moments of the nucleon generalized parton distributions within lattice QCD using two dynamical flavors of degenerate twisted mass fermions. Our simulations are performed on lattices with three different values of the lattice spacings, namely, a =0.089 fm , a =0.070 fm ,... [Phys. Rev. D 83, 114513] Published Tue Jun 21, 2011

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Top quark asymmetry from a non-Abelian horizontal symmetry (2011)

Sunghoon Jung, Aaron Pierce, and James D. Wells

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2011-06-22

Description: Author(s): Sunghoon Jung, Aaron Pierce, and James D. Wells Motivated by the persistence of a large measured top quark forward-backward asymmetry at the Tevatron, we examine a model of non-Abelian flavor gauge symmetry. The exchange of the gauge bosons in the t -channel can give a large A FB t due to the forward Rutherford scattering peak. We address generic co... [Phys. Rev. D 83, 114039] Published Tue Jun 21, 2011

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Integrating holographic vector dominance to hidden local symmetry for the nucleon form factor (2011)

Masayasu Harada and Mannque Rho

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2011-06-23

Description: Author(s): Masayasu Harada and Mannque Rho We derive a two-parameter formula for the electromagnetic form factors of the nucleon described as an instanton by “integrating out” all Kaluza-Klein modes other than the lowest mesons from the infinite tower of vector mesons in holographic QCD while preserving hidden local symmetry for the resultan... [Phys. Rev. D 83, 114040] Published Wed Jun 22, 2011

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Fresh look at double parton scattering (2011)

M. G. Ryskin and A. M. Snigirev

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2011-06-25

Description: Author(s): M. G. Ryskin and A. M. Snigirev A revised formula for the inclusive cross section of a double parton scattering process in a hadron collision is suggested basing on the modified collinear two-parton distributions extracted from deep inelastic scattering. The possible phenomenological issues are discussed. [Phys. Rev. D 83, 114047] Published Fri Jun 24, 2011

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General helicity formalism for semi-inclusive deep inelastic scattering (2011)

M. Anselmino, M. Boglione, U. D’Alesio, S. Melis, F. Murgia, E. R. Nocera, and A. Prokudin

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2011-06-09

Description: Author(s): M. Anselmino, M. Boglione, U. D’Alesio, S. Melis, F. Murgia, E. R. Nocera, and A. Prokudin We study polarized and unpolarized semi-inclusive deep inelastic scattering processes, ℓ ( S ℓ )+ p ( S )→ ℓ ′ h X , within a QCD parton model motivated by a generalized QCD factorization scheme. We take into account all transverse motions, of partons inside the initial proton and of hadrons inside the fragmenti... [Phys. Rev. D 83, 114019] Published Wed Jun 08, 2011

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Threshold-resummed cross section for the Drell-Yan process in pion-nucleon collisions at COMPASS (2011)

Matthias Aicher, Andreas Schäfer, and Werner Vogelsang

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2011-06-10

Description: Author(s): Matthias Aicher, Andreas Schäfer, and Werner Vogelsang We present a study of the Drell-Yan process in pion-proton collisions including next-to-leading-logarithmic threshold-resummed contributions. We analyze rapidity-integrated as well as rapidity-differential cross sections in the kinematic regime relevant for the COMPASS fixed target experiment. We fi... [Phys. Rev. D 83, 114023] Published Thu Jun 09, 2011

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Isovector axial-vector form factors of octet baryons in QCD (2011)

Güray Erkol and Altug Ozpineci

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2011-06-10

Description: Author(s): Güray Erkol and Altug Ozpineci We compute the diagonal isovector axial-vector as well as induced pseudoscalar form factors of nucleon, Σ , and Ξ baryons by employing the light-cone QCD sum rules to leading order in QCD and including distribution amplitudes up to twist 6. Extrapolating our sum-rules results to low-momentum transfer... [Phys. Rev. D 83, 114022] Published Thu Jun 09, 2011

Keywords: Strong interactions & Lattice methods

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Double Sivers effect asymmetries and their impact on transversity measurements at RHIC (2011)

Daniël Boer, Wilco J. den Dunnen, and Aram Kotzinian

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2011-06-16

Description: Author(s): Daniël Boer, Wilco J. den Dunnen, and Aram Kotzinian We study double transverse spin asymmetries in the Drell-Yan process at measured transverse momentum of the lepton pair. Contrary to what a collinear factorization approach would suggest, a nonzero double transverse spin asymmetry in the laboratory frame a priori does not imply nonzero transversity.... [Phys. Rev. D 83, 114032] Published Wed Jun 15, 2011

Keywords: Strong interactions & Lattice methods

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Extracting scattering phase shifts in higher partial waves from lattice QCD calculations (2011)

Thomas Luu and Martin J. Savage

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2011-06-16

Description: Author(s): Thomas Luu and Martin J. Savage Lüscher’s method is routinely used to determine meson-meson, meson-baryon, and baryon-baryon s-wave scattering amplitudes below inelastic thresholds from lattice QCD calculations—presently at unphysical light-quark masses. In this work we review the formalism and develop the requisite expressions to... [Phys. Rev. D 83, 114508] Published Wed Jun 15, 2011

Keywords: Strong interactions & Lattice methods

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Ditau-jet tagging and boosted Higgs bosons from a multi-TeV resonance (2011)

Andrey Katz, Minho Son, and Brock Tweedie

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2011-06-16

Description: Author(s): Andrey Katz, Minho Son, and Brock Tweedie New TeV-scale physics processes at the LHC can produce Higgs bosons with substantive transverse Lorentz boost, such that the Higgs’s decay products are nominally contained in a single jet. In the case of a light Higgs decaying predominantly to b b ̅ , previous studies have shown that these Higg... [Phys. Rev. D 83, 114033] Published Wed Jun 15, 2011

Keywords: Strong interactions & Lattice methods

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Testing proposals for the Yang-Mills vacuum wavefunctional by measurement of the vacuum (2011)

J. Greensite, H. Matevosyan, Š. Olejník, M. Quandt, H. Reinhardt, and A. P. Szczepaniak

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2011-06-17

Description: Author(s): J. Greensite, H. Matevosyan, Š. Olejník, M. Quandt, H. Reinhardt, and A. P. Szczepaniak We review a method, suggested many years ago, to numerically measure the relative amplitudes of the true Yang-Mills vacuum wavefunctional in a finite set of lattice-regulated field configurations. The technique is applied in 2+1 dimensions to sets of Abelian plane wave configurations of varying ampl... [Phys. Rev. D 83, 114509] Published Thu Jun 16, 2011

Keywords: Strong interactions & Lattice methods

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Constraining the mixing matrix for the standard model with four generations: Time-dependent and semileptonic CP asymmetries in B_{d}^{0}, B_{s}, and D^{0} (2011)

Soumitra Nandi and Amarjit Soni

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2011-06-17

Description: Author(s): Soumitra Nandi and Amarjit Soni Using existing experimental information from K , B , and D decays as well as electroweak precision tests and oblique parameters, we provide constraints and correlations on the parameters of the 4×4 mixing matrix for the standard model (SM) with four generations (SM4). We emphasize that some correlatio... [Phys. Rev. D 83, 114510] Published Thu Jun 16, 2011

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Step-scaling with off-shell renormalization (2011)

R. Arthur and P. A. Boyle (RBC and UKQCD Collaborations)

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2011-06-21

Description: Author(s): R. Arthur and P. A. Boyle (RBC and UKQCD Collaborations) We make use of twisted boundary conditions for off-shell, Rome-Southampton renormalization. This allows us to define vertex functions at a fixed physical momentum that need not be a Fourier mode. This definition includes choosing a fixed orientation with respect to the lattice axes; only then do lat... [Phys. Rev. D 83, 114511] Published Mon Jun 20, 2011

Keywords: Strong interactions & Lattice methods

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Exploring anomalous top-quark interactions via the final lepton in tt[over ¯] productions/decays at hadron colliders (2011)

Zenrō Hioki and Kazumasa Ohkuma

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2011-06-24

Description: Author(s): Zenrō Hioki and Kazumasa Ohkuma We study momentum distributions of the final-state charged lepton in p p ̅ / p p → t t ̅ → ℓ + X ( ℓ = e or μ ) at hadron colliders, i.e., Tevatron and Large Hadron Collider (LHC), in order to explore possible new-physics effects in the top-quark sector. Assuming general model-independent t t ̅ g ... [Phys. Rev. D 83, 114045] Published Thu Jun 23, 2011

Keywords: Strong interactions & Lattice methods

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Radiative decays of the Y(3940), Z(3930), and the X(4160) as dynamically generated resonances (2011)

Tanja Branz, Raquel Molina, and Eulogio Oset

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2011-06-07

Description: Author(s): Tanja Branz, Raquel Molina, and Eulogio Oset We study the radiative decay properties of the charmoniumlike X , Y , and Z mesons generated dynamically from vector-meson–vector-meson interaction in the framework of a unitarized hidden-gauge formalism. In the present work, we calculate the one- and two-photon decay widths of the hidden-charm Y (3940... [Phys. Rev. D 83, 114015] Published Mon Jun 06, 2011

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General positivity bounds for spin observables in single particle inclusive production (2011)

Zhong-Bo Kang and Jacques Soffer

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2011-06-09

Description: Author(s): Zhong-Bo Kang and Jacques Soffer Positivity constraints, derived initially assuming parity conservation, for the inclusive reaction of the type A (spin1/2)+ B (spin1/2)→ C + X , where the spins of both initial spin-1/2 particles can be in any possible directions and no polarization is observed in the final state, are generalized to the ca... [Phys. Rev. D 83, 114020] Published Wed Jun 08, 2011

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Possible 2S and 1D charmed and charmed-strange mesons (2011)

Bing Chen, Ling Yuan, and Ailin Zhang

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2011-06-11

Description: Author(s): Bing Chen, Ling Yuan, and Ailin Zhang Possible 2 S and 1 D excited D and D s states are studied, the charmed states D (2550) 0 , D * (2600) , D (2750) 0 , and D * (2760) newly observed by the BABAR Collaboration are analyzed. The masses of these states are explored within the Regge trajectory phenomenology, and the strong decay widths are computed wi... [Phys. Rev. D 83, 114025] Published Fri Jun 10, 2011

Keywords: Strong interactions & Lattice methods

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Nucleon strange quark content from two-flavor lattice QCD with exact chiral symmetry (2011)

K. Takeda, S. Aoki, S. Hashimoto, T. Kaneko, J. Noaki, and T. Onogi (JLQCD Collaboration)

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2011-06-14

Description: Author(s): K. Takeda, S. Aoki, S. Hashimoto, T. Kaneko, J. Noaki, and T. Onogi (JLQCD Collaboration) The strange quark content of the nucleon ⟨ N | s ̅ s | N ⟩ is calculated in dynamical lattice QCD employing the overlap fermion formulation. For this quantity, exact chiral symmetry guaranteed by the Ginsparg-Wilson relation is crucial to avoid large contamination due to a possible operator mixing w... [Phys. Rev. D 83, 114506] Published Mon Jun 13, 2011

Keywords: Strong interactions & Lattice methods

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Brillouin improvement for Wilson fermions (2011)

Stephan Dürr and Giannis Koutsou

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2011-06-22

Description: Author(s): Stephan Dürr and Giannis Koutsou We present a parameter-free Wilson-type lattice Dirac operator with an 81-point stencil for the covariant derivative and the Laplacian, which attempts to minimize the breaking of rotational symmetry near the boundary of the Brillouin zone. The usefulness of this “Brillouin operator” in practical app... [Phys. Rev. D 83, 114512] Published Tue Jun 21, 2011

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Naive time-reversal odd phenomena in semi-inclusive deep-inelastic scattering from light-cone constituent quark models (2011)

B. Pasquini and P. Schweitzer

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2011-06-24

Description: Author(s): B. Pasquini and P. Schweitzer We present results for leading-twist azimuthal asymmetries in semi-inclusive lepton-nucleon deep-inelastic scattering due to naive time-reversal odd transverse-momentum-dependent parton distribution functions from the light-cone constituent-quark model. We carefully discuss the range of applicabilit... [Phys. Rev. D 83, 114044] Published Thu Jun 23, 2011

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Transverse momentum dependent parton distribution and fragmentation functions with QCD evolution (2011)

S. Mert Aybat and Ted C. Rogers

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2011-06-24

Description: Author(s): S. Mert Aybat and Ted C. Rogers We assess the current phenomenological status of transverse momentum dependent (TMD) parton distribution functions (PDFs) and fragmentation functions (FFs) and study the effect of consistently including perturbative QCD (pQCD) evolution. Our goal is to initiate the process of establishing reliable, ... [Phys. Rev. D 83, 114042] Published Thu Jun 23, 2011

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Searching for the layered structure of space at the LHC (2011)

Luis A. Anchordoqui, De Chang Dai, Haim Goldberg, Greg Landsberg, Gabe Shaughnessy, Dejan Stojkovic, and Thomas J. Weiler

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2011-06-24

Description: Author(s): Luis A. Anchordoqui, De Chang Dai, Haim Goldberg, Greg Landsberg, Gabe Shaughnessy, Dejan Stojkovic, and Thomas J. Weiler Alignment of the main energy fluxes along a straight line in a target plane has been observed in families of cosmic ray particles detected in the Pamir mountains. The fraction of events with alignment is statistically significant for families with superhigh energies and large numbers of hadrons. Thi... [Phys. Rev. D 83, 114046] Published Thu Jun 23, 2011

Keywords: Strong interactions & Lattice methods

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Next-to-leading order QCD corrections to tZ associated production via the flavor-changing neutral-current couplings at hadron colliders (2011)

Bo Hua Li, Yue Zhang, Chong Sheng Li, Jun Gao, and Hua Xing Zhu

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2011-06-29

Description: Author(s): Bo Hua Li, Yue Zhang, Chong Sheng Li, Jun Gao, and Hua Xing Zhu We present the complete next-to-leading order (NLO) QCD corrections to t Z associated production induced by the model-independent t q g and t q Z flavor-changing neutral-current couplings at hadron colliders, respectively. Our results show that, for the t u Z coupling the NLO QCD corrections can enhance th... [Phys. Rev. D 83, 114049] Published Tue Jun 28, 2011

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