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  • Articles  (1,132)
  • Springer  (1,132)
  • American Chemical Society (ACS)
  • American Geophysical Union
  • National Academy of Sciences
  • 2015-2019  (1,132)
  • 2005-2009
  • 1990-1994
  • 1980-1984
  • 2017  (1,132)
  • European Physical Journal C  (224)
  • 1699
  • Physics  (1,132)
Collection
  • Articles  (1,132)
Source
Publisher
  • Springer  (1,132)
  • American Chemical Society (ACS)
  • American Geophysical Union
  • National Academy of Sciences
Years
  • 2015-2019  (1,132)
  • 2005-2009
  • 1990-1994
  • 1980-1984
Year
Journal
Topic
  • Physics  (1,132)
  • 1
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    Measurement of jet production cross sections in deep-inelastic ep scattering at HERA (2017)
    Springer
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    Publication Date: 2017-04-01
    Description: A precision measurement of jet cross sections in neutral current deep-inelastic scattering for photon virtualities $$5.5
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  • 2
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    Determination of the strong coupling constant $${varvec{{alpha _mathrm{s} (m_mathrm{Z})}}}$$ in next-to-next-to-leading order QCD using H1 jet cross section measurements (2017)
    Springer
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    Publication Date: 2017-11-01
    Description: The strong coupling constant $$alpha _mathrm{s}$$ α s is determined from inclusive jet and dijet cross sections in neutral-current deep-inelastic ep scattering (DIS) measured at HERA by the H1 collaboration using next-to-next-to-leading order (NNLO) QCD predictions. The dependence of the NNLO predictions and of the resulting value of $$alpha _mathrm{s} (m_mathrm{Z})$$ α s ( m Z ) at the Z-boson mass $$m_Z$$ m Z are studied as a function of the choice of the renormalisation and factorisation scales. Using inclusive jet and dijet data together, the strong coupling constant is determined to be $$alpha _mathrm{s} (m_mathrm{Z}) =0.1157,(20)_mathrm{exp},(29)_mathrm{th}$$ α s ( m Z ) = 0.1157 ( 20 ) exp ( 29 ) th . Complementary, $$alpha _mathrm{s} (m_mathrm{Z})$$ α s ( m Z ) is determined together with parton distribution functions of the proton (PDFs) from jet and inclusive DIS data measured by the H1 experiment. The value $$alpha _mathrm{s} (m_mathrm{Z}) =0.1142,(28)_mathrm{tot}$$ α s ( m Z ) = 0.1142 ( 28 ) tot obtained is consistent with the determination from jet data alone. The impact of the jet data on the PDFs is studied. The running of the strong coupling is tested at different values of the renormalisation scale and the results are found to be in agreement with expectations.
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  • 3
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    Higgs EFT for 2HDM and beyond (2017)
    Springer
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    Publication Date: 2017-03-22
    Description: We discuss the validity of the Standard Model Effective Field Theory (SM EFT) as the low-energy effective theory for the two-Higgs-doublet Model (2HDM). Using the up-to-date Higgs signal strength measurements at the LHC, one can obtain a likelihood function for the Wilson coefficients of dimension-6 operators in the EFT Lagrangian. Given the matching between the 2HDM and the EFT, the constraints on the Wilson coefficients can be translated into constraints on the parameters of the 2HDM Lagrangian. We discuss under which conditions such a procedure correctly reproduces the true limits on the 2HDM. Finally, we employ the SM EFT to identify the pattern of the Higgs boson couplings that are needed to improve the fit to the current Higgs data. To this end, one needs, simultaneously, to increase the top Yukawa coupling, decrease the bottom Yukawa coupling, and induce a new contact interaction of the Higgs boson with gluons. We comment on how these modifications can be realized in the 2HDM extended by new colored particles.
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  • 4
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    Two-loop corrections to the $$\rho $$ ρ parameter in Two-Higgs-Doublet models (2017)
    Springer
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    Publication Date: 2017-03-22
    Description: Models with two scalar doublets are among the simplest extensions of the Standard Model which fulfill the relation \(\rho = 1\) at lowest order for the \(\rho \) parameter as favored by experimental data for electroweak observables allowing only small deviations from unity. Such small deviations \(\varDelta \rho \) originate exclusively from quantum effects with special sensitivity to mass splittings between different isospin components of fermions and scalars. In this paper the dominant two-loop electroweak corrections to \(\varDelta \rho \) are calculated in the CP -conserving THDM, resulting from the top-Yukawa coupling and the self-couplings of the Higgs bosons in the gauge-less limit. The on-shell renormalization scheme is applied. With the assumption that one of the CP -even neutral scalars represents the scalar boson observed by the LHC experiments, with standard properties, the two-loop non-standard contributions in \(\varDelta \rho \) can be separated from the standard ones. These contributions are of particular interest since they increase with mass splittings between non-standard Higgs bosons and can be additionally enhanced by \(\tan \beta \) and \(\lambda _5\) , an additional free coefficient of the Higgs potential, and can thus modify the one-loop result substantially. Numerical results are given for the dependence on the various non-standard parameters, and the influence on the calculation of electroweak precision observables is discussed.
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  • 5
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    Color-singlet production at NNLO in MCFM (2017)
    Springer
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    Publication Date: 2017-01-01
    Description: We present the implementation of several color-singlet final-state processes at Next-to-Next-to Leading Order (NNLO) accuracy in QCD to the publicly available parton-level Monte Carlo program MCFM. Specifically we discuss the processes \(pp\rightarrow H\) , \(pp\rightarrow Z\) , \(pp\rightarrow W\) , \(pp\rightarrow HZ\) , \(pp\rightarrow HW\) and \(pp\rightarrow \gamma \gamma \) . Decays of the unstable bosons are fully included, resulting in a flexible fully differential Monte Carlo code. The NNLO corrections have been calculated using the non-local N -jettiness subtraction approach. Special attention is given to the numerical aspects of running MCFM for these processes at this order. We pay particular attention to the systematic uncertainties due to the power corrections induced by the N -jettiness regularization scheme and the evaluation time needed to run the hybrid openMP/MPI version of MCFM at NNLO on multi-processor systems.
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  • 6
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    Erratum to: The limits on the strong Higgs sector parameters in the presence of new vector resonances (2017)
    Springer
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    Publication Date: 2017-01-01
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  • 7
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    B-decay anomalies in a composite leptoquark model (2017)
    Springer
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    Publication Date: 2017-01-01
    Description: The collection of a few anomalies in semileptonic B -decays, especially in \(b\rightarrow c \tau \bar{\nu }\) , invites to speculate about the emergence of some striking new phenomena, perhaps interpretable in terms of a weakly broken \(U(2)^n\) flavor symmetry and of leptoquark mediators. Here we aim at a partial UV completion of this interpretation by generalizing the minimal composite Higgs model to include a composite vector leptoquark as well.
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  • 8
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    Radiative neutrino mass in alternative left–right model (2017)
    Springer
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    Publication Date: 2017-02-15
    Description: We propose a radiative seesaw model in an alternative left–right model without any bidoublet scalar fields, in which all the fermion masses in the standard model are generated through a canonical seesaw mechanism at the tree level. On the other hand the observed neutrino masses are generated at two-loop level. In this paper we focus on the neutrino sector and show how to induce the active neutrino masses. Then we discuss the observed neutrino oscillation, constraints from lepton flavor violations, new sources of the muon anomalous magnetic moment, a long-lived dark matter candidate with keV scale mass, and collider physics.
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  • 9
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    Noether symmetry approach in f ( T ,  B ) teleparallel cosmology (2017)
    Springer
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    Publication Date: 2017-02-18
    Description: We consider the cosmology derived from f ( T ,  B ) gravity where T is the torsion scalar and \(B=\frac{2}{e}\partial _{\mu }(e T^{\mu })\) a boundary term. In particular we discuss how it is possible to recover, under the same standard, the teleparallel f ( T ) gravity, the curvature f ( R ) gravity, and the teleparallel–curvature f ( R ,  T ) gravity, which are particular cases of f ( T ,  B ). We adopt the Noether Symmetry Approach to study the related dynamical systems and to find cosmological solutions.
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  • 10
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    Likelihood analysis of supersymmetric SU(5) GUTs (2017)
    Springer
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    Publication Date: 2017-02-18
    Description: We perform a likelihood analysis of the constraints from accelerator experiments and astrophysical observations on supersymmetric (SUSY) models with SU(5) boundary conditions on soft SUSY-breaking parameters at the GUT scale. The parameter space of the models studied has seven parameters: a universal gaugino mass \(m_{1/2}\) , distinct masses for the scalar partners of matter fermions in five- and ten-dimensional representations of SU(5), \(m_5\) and \(m_{10}\) , and for the \(\mathbf {5}\) and \({\bar{\mathbf{5}}}\) Higgs representations \(m_{H_u}\) and \(m_{H_d}\) , a universal trilinear soft SUSY-breaking parameter \(A_0\) , and the ratio of Higgs vevs \(\tan \beta \) . In addition to previous constraints from direct sparticle searches, low-energy and flavour observables, we incorporate constraints based on preliminary results from 13 TeV LHC searches for jets + events and long-lived particles, as well as the latest PandaX-II and LUX searches for direct Dark Matter detection. In addition to previously identified mechanisms for bringing the supersymmetric relic density into the range allowed by cosmology, we identify a novel \({\tilde{u}_R}/{\tilde{c}_R} - \tilde{\chi }^{0}_{1}\) coannihilation mechanism that appears in the supersymmetric SU(5) GUT model and discuss the role of \({{\tilde{\nu }}_\tau }\) coannihilation. We find complementarity between the prospects for direct Dark Matter detection and SUSY searches at the LHC.
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