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Nuclear Theory·nucl-th

Wednesday·November 23, 2016

16 papers—9 primary·7 cross-listed

All16Primary9Cross-lists7
  1. 10

    [Submitted on 21 Nov 2016] (cross-list from hep-ph)

    Neutral Weak Form Factors of Proton and Neutron

    Raza Sabbir Sufian🇺🇸

    We determine the nucleon neutral weak electromagnetic form factors by combining results from light-front holographic QCD and lattice QCD calculations. We deduce nucleon electromagnetic form factors from light-front holographic QCD which provides a good parametrization of the experimental data of the nucleon electromagnetic form factors in the entire momentum transfer range and isolate the strange quark electromagnetic form factors using lattice QCD. From these calculations, we obtain precise estimates of the neutral weak form factors in the momentum transfer range of . From the lattice QCD calculation, we present -dependence of the strange quark form factors. We also deduce the neutral weak Dirac and Pauli form factors of the proton and the neutron.

    Comments:
    Published Version, 9 figures, 12 pages
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Lattice (hep-lat); Nuclear Theory (nucl-th)
    arXiv:
    1611.07031 [pdf]
    PRD(2017)·10 citations
  2. 11

    [Submitted on 21 Nov 2016] (cross-list from hep-th)

    Second-order transport, quasinormal modes and zero-viscosity limit in the Gauss-Bonnet holographic fluid

    Sašo Grozdanov🇳🇱 · Andrei O. Starinets🇬🇧

    Gauss-Bonnet holographic fluid is a useful theoretical laboratory to study the effects of curvature-squared terms in the dual gravity action on transport coefficients, quasinormal spectra and the analytic structure of thermal correlators at strong coupling. To understand the behavior and possible pathologies of the Gauss-Bonnet fluid in dimensions, we compute (analytically and non-perturbatively in the Gauss-Bonnet coupling) its second-order transport coefficients, the retarded two- and three-point correlation functions of the energy-momentum tensor in the hydrodynamic regime as well as the relevant quasinormal spectrum. The Haack-Yarom universal relation among the second-order transport coefficients is violated at second order in the Gauss-Bonnet coupling. In the zero-viscosity limit, the holographic fluid still produces entropy, while the momentum diffusion and the sound attenuation are suppressed at all orders in the hydrodynamic expansion. By adding higher-derivative electromagnetic field terms to the action, we also compute corrections to charge diffusion and identify the non-perturbative parameter regime in which the charge diffusion constant vanishes.

    Comments:
    56 pages, 3 figures; V2: references added, version published in JHEP
    Subjects:
    High Energy Physics — Theory (hep-th); Strongly Correlated Electrons (cond-mat.str-el); General Relativity and Quantum Cosmology (gr-qc); Nuclear Theory (nucl-th)
    arXiv:
    1611.07053 [pdf]
    JHEP(2017)·106 citations
  3. 12

    [Submitted on 21 Nov 2016] (cross-list from nucl-ex)

    Electric dipole polarizability of Ca and implications for the neutron skin

    J. Birkhan (1) · M. Miorelli (2,3) · S. Bacca (2,4) · S. Bassauer (1) · C.A. Bertulani (5) · G. Hagen (6,7) · H. Matsubara (8,9) · P. von Neumann-Cosel (1) · T. Papenbrock (6,7) · N. Pietralla (1) · V.Yu. Ponomarev (1) · A. Richter (1) · A. Schwenk (1,10,11) · A. Tamii (8) ((1) Institut fuer Kernphysik, Technische Universitaet Darmstadt, (2) TRIUMF, (3) Department of Physics and Astronomy, University of British Columbia, Vancouver, (4) Department of Physics and Astronomy, University of Manitoba, (5) Department of Physics and Astronomy, Texas AandM University-Commerce, (6) Physics Division, Oak Ridge National Laboratory, (7) Department of Physics and Astronomy, University of Tennessee, Knoxville, (8) Research Center for Nuclear Physics, Osaka University, (9) Tokyo Women's Medical University, (10) ExtreMe Matter Institute EMMI, GSI Helmholtzzentrum fuer Schwerionenforschung GmbH, (11) Max-Planck-Institut fuer Kernphysik)

    The electric dipole strength distribution in Ca-48 between 5 and 25 MeV has been determined at RCNP, Osaka, from proton inelastic scattering experiments at forward angles. Combined with photoabsorption data at higher excitation energy, this enables for the first time the extraction of the electric dipole polarizability alpha_D(Ca-48) = 2.07(22) fm^3. Remarkably, the dipole response of Ca-48 is found to be very similar to that of Ca-40, consistent with a small neutron skin in Ca-48. The experimental results are in good agreement with ab initio calculations based on chiral effective field theory interactions and with state-of-the-art density-functional calculations, implying a neutron skin in Ca-48 of 0.14 - 0.20 fm.

    Comments:
    6 pages, 5 figures
    Subjects:
    Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    1611.07072 [pdf]
    PRL(2017)·211 citations
  4. 13

    [Submitted on 21 Nov 2016] (cross-list from hep-th)

    Path-integral formula for local thermal equilibrium

    Masaru Hongo🇯🇵

    We develop a complete path-integral formulation of relativistic quantum fields in local thermal equilibrium, which brings about the emergence of thermally induced curved spacetime. The resulting action is shown to have full diffeomorphism invariance and gauge invariance in thermal spacetime with imaginary-time independent backgrounds. This leads to the notable symmetry properties of emergent thermal spacetime: Kaluza-Klein gauge symmetry, spatial diffeomorphism symmetry, and gauge symmetry. A thermodynamic potential in local thermal equilibrium, or the so-called Masseiu-Planck functional, is identified as a generating functional for conserved currents such as the energy-momentum tensor and the electric current.

    Comments:
    48 pages, 4 figures
    Subjects:
    High Energy Physics — Theory (hep-th); Quantum Gases (cond-mat.quant-gas); Statistical Mechanics (cond-mat.stat-mech); High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    1611.07074 [pdf]
    Annals Phys.(2017)·36 citations
  5. 14

    [Submitted on 22 Nov 2016] (cross-list from hep-ph)

    Effect of medium recoil and broadening on single inclusive jet suppression in high-energy heavy-ion collisions

    Xin-Nian Wang🇨🇳 · Shu-Yi Wei🇨🇳 · Han-Zhong Zhang🇨🇳

    Jet energy loss and single inclusive jet suppression in high-energy heavy-ion collisions are studied within a pQCD parton model that includes both elastic and radiative interactions between jet shower and medium partons as they propagate through the quark-gluon plasma. The collisional energy loss of jets with a given cone-size is found to be relatively small comparing with the radiative energy loss. However the effect of transverse momentum broadening due to elastic scattering is significant in the calculation of radiative energy loss within the higher-twist formalism. The nuclear modification factors for single inclusive jets with different cone-sizes are calculated and compared to experimental data as measured by ALICE and ATLAS experiments in Pb+Pb collisions at TeV. Results on jet suppression in Pb+Pb collisions at TeV are also presented.

    Comments:
    Published version
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    1611.07211 [pdf]
    PRC(2017)·23 citations
  6. 15

    [Submitted on 22 Nov 2016] (cross-list from nucl-ex)

    The legacy of the experimental hadron physics programme at COSY

    Colin Wilkin🇬🇧

    The experimental hadronic physics programme at the COoler SYnchrotron of the Forschungszentrum Juelich terminated at the end of 2014. After describing the accelerator and the associated facilities, a review is presented of the major achievements in the field realized over the twenty years of intense research activity.

    Comments:
    Invited review prepared for the European Physical Journal A
    Subjects:
    Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    1611.07250 [pdf]
    EPJA(2017)·41 citations
  7. 16

    [Submitted on 18 Nov 2016] (cross-list from hep-th)

    QCD, with Strings Attached

    Alberto Guijosa🇲🇽

    In the nearly twenty years that have elapsed since its discovery, the gauge-gravity correspondence has become established as an efficient tool to explore the physics of a large class of strongly-coupled field theories. A brief overview is given here of its formulation and a few of its applications, emphasizing attempts to emulate aspects of the strong-coupling regime of quantum chromodynamics (QCD). To the extent possible, the presentation is self-contained, and in particular, it does not presuppose knowledge of string theory.

    Comments:
    Invited review article, 32 pages of text plus lots of references
    Subjects:
    High Energy Physics — Theory (hep-th); General Relativity and Quantum Cosmology (gr-qc); High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    1611.07472 [pdf]
    IJMPE(2016)·4 citations

Affiliations

first authorsco-authorsvia INSPIRE