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Nuclear Theory·nucl-th

Thursday·June 11, 2015

7 papers—3 primary·4 cross-listed

All7Primary3Cross-lists4
  1. 04

    [Submitted on 8 Jun 2015] (cross-list from hep-ph)

    Correct Definition of the Gluon Distribution Function at High Energy Colliders

    Gouranga C. Nayak🇺🇸

    Unlike QED, since F_{\mu \nu}^a(x)F^{\mu \nu a}(0) in QCD contains cubic and quartic powers of the gluon field the present definition of the gluon distribution function at high energy colliders is not consistent with the number operator interpretation of the gluon. In this paper we derive the correct definition of the gluon distribution function at high energy colliders from first principles which is consistent with the number operator interpretation of the gluon and is gauge invariant and is consistent with the factorization theorem in QCD.

    Comments:
    32 pages latex. arXiv admin note: substantial text overlap with arXiv:1506.02593
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Theory (nucl-th)
    arXiv:
    1506.02651 [pdf]
    24 citations
  2. 05

    [Submitted on 10 Jun 2015] (cross-list from nucl-ex)

    Elliptic and Triangular Flow of Identified Particles from the AMPT Model at RHIC Energies

    Xu Sun🇨🇳 · Jianli Liu🇨🇳 · Alexander Schmah🇺🇸 · Shusu Shi🇨🇳 · Jingbo Zhang🇨🇳 · Lei Huo🇨🇳 · Hanzhi Jiang🇨🇳

    The elliptic flow () at 11.5, 39, and 200 GeV and triangular flow () at 200 GeV of identified particles ( and ) from 0\%--80\% central Au+Au collisions are analyzed using a multiphase transport (AMPT) model. It is shown that the experimental results from the -sub event plane method can be reproduced with a parton scattering cross section between 1.5 and 3 mb. We also studied the differential and integrated ratios and conclude that they are anti-corrected with the parton scattering cross section.

    Comments:
    7 pages, 7 figures
    Subjects:
    Nuclear Experiment (nucl-ex); High Energy Physics — Experiment (hep-ex); High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    1506.03158 [pdf]
    J.Phys.G(2015)·8 citations
  3. 06

    [Submitted on 10 Jun 2015] (cross-list from hep-ph)

    Quark production in heavy ion collisions I. Formalism and boost invariant fermionic light-cone mode functions

    F. Gelis🇫🇷 · N. Tanji🇩🇪

    We revisit the problem of quark production in high energy heavy ion collisions, at leading order in in the color glass condensate framework. In this first paper, we setup the formalism and express the quark spectrum in terms of a set of mode functions of the Dirac equation. We determine analytically their initial value in the Fock-Schwinger gauge on a proper time surface , in a basis which makes manifest the boost invariance properties of this problem. We also describe a statistical algorithm to perform the sampling of the mode functions.

    Comments:
    40 pages, 3 figures, alternate derivation in the new appendix B
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    1506.03327 [pdf]
    JHEP(2016)·21 citations
  4. 07

    [Submitted on 10 Jun 2015] (cross-list from hep-ph)

    Dynamical coupled-channels model for neutrino-induced meson productions in resonance region

    S. X. Nakamura (Osaka Univ.)🇯🇵 · H. Kamano (RCNP, Osaka Univ.)🇯🇵 · T. Sato (Osaka Univ.)🇯🇵

    A dynamical coupled-channels (DCC) model for neutrino-nucleon reactions in the resonance region is developed. Starting from the DCC model that we have previously developed through an analysis of reaction data for GeV, we extend the model of the vector current to 3.0 (GeV/) by analyzing electron-induced reaction data for both proton and neutron targets. We derive axial-current matrix elements that are related to the interactions of the DCC model through the Partially Conserved Axial Current (PCAC) relation. Consequently, the interference pattern between resonant and non-resonant amplitudes is uniquely determined. We calculate cross sections for neutrino-induced meson productions, and compare them with available data. Our result for the single-pion production reasonably agrees with the data. We also make a comparison with the double-pion production data. Our model is the first DCC model that can give the double-pion production cross sections in the resonance region. We also make comparison of our result with other existing models to reveal an importance of testing the models in the light of PCAC and electron reaction data. The DCC model developed here will be a useful input for constructing a neutrino-nucleus reaction model and a neutrino event generator for analyses of neutrino experiments.

    Comments:
    38 pages, 52 figures, published version; minor modifications on v1
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Theory (nucl-th)
    arXiv:
    1506.03403 [pdf]
    PRD(2015)·119 citations

Affiliations

first authorsco-authorsvia INSPIRE