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Nuclear Theory·nucl-th

Wednesday·May 3, 2017

6 papers—3 primary·3 cross-listed

All6Primary3Cross-lists3
  1. 01

    [Submitted on 2 May 2017]

    Photon production spectrum above with a lattice quark propagator

    Taekwang Kim🇯🇵 · Masayuki Asakawa🇯🇵 · Masakiyo Kitazawa🇯🇵

    The photon production rate from the deconfined medium is analyzed with the photon self-energy constructed from the quark propagator obtained by the numerical simulation on the quenched lattice for two values of temperature, and , above the critical temperature . The photon self-energy is calculated by the Schwinger-Dyson equation with the lattice quark propagator and a vertex function determined so as to satisfy the Ward-Takahashi identity. The obtained photon production rate exhibits a similar behavior as the perturbative results at the energy of photons larger than ~GeV.

    Comments:
    11 pages, 10 figures
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph)
    arXiv:
    1705.00755 [pdf]
    PTEP(2018)·0 citations
  2. 02

    [Submitted on 28 Apr 2017]

    Neutron Parton Structure And The Light-Front Spectral Function Of 3He

    Emanuele Pace🇮🇹 · Alessio Del Dotto🇮🇹 · Leonid Kaptari🇷🇺 · Matteo Rinaldi🇪🇸 · Giovanni Salmè🇮🇹 · Sergio Scopetta🇮🇹

    Semi-inclusive deep inelastic electron scattering off polarized 3He is studied in a non-relativistic framework, using a distorted spin-dependent spectral function for 3He to take care of the final state interaction between the observed pion and the remnant. A simple procedure is shown to be valuable for the extraction of Sivers and Collins asymmetries for the neutron fromthe corresponding asymmetries for 3He. To extend this study in a relativistic framework, a novel approach for a Poincaré covariant description of nuclear dynamics is presented, based on the light-front Hamiltonian dynamics. The key quantity is the light-front spectral function, where both normalization and momentum sum rule can be satisfied at the same time. Preliminary results are discussed for an initial analysis of the role of relativity in the EMC effect in 3He, and the generalization of the procedure for the extraction of neutron asymmetries within the light-front dynamics is outlined.

    Comments:
    Pages 8, figures 3. Talk given at the 26th International Nuclear Physics Conference, 11-16 September, 2016, Adelaide, Australia, to be published in Proceedings of Science. Comments added. arXiv admin note: text overlap with arXiv:1602.06521
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Theory (hep-th)
    arXiv:
    1705.00966 [pdf]
    PoS(2017)·3 citations
  3. 03

    [Submitted on 2 May 2017]

    Baryon susceptibilities from a holographic equation of state

    Israel Portillo🇺🇸

    A black hole holographic model is used to mimic the behavior of the quark gluon plasma at finite temperature and density. This model reproduces lattice data at and displays critical behavior at large densities. High order baryon susceptibilities are used to extract freeze-out points by comparing those susceptibilities with the corresponding net-protons distribution measured by STAR. Possible experimental signatures of the critical end point are discussed.

    Comments:
    4 pages, 3 figures, proceedings for Quark Matter 2017
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1705.01021 [pdf]
    NPA(2017)·6 citations
  4. 04

    [Submitted on 29 Apr 2017] (cross-list from hep-ph)

    Hadronic molecules

    Feng-Kun Guo🇨🇳 · Christoph Hanhart🇩🇪 · Ulf-G. Meißner🇩🇪 · Qian Wang🇩🇪 · Qiang Zhao🇨🇳 · Bing-Song Zou🇨🇳

    A large number of experimental discoveries especially in the heavy quarkonium sector that did not at all fit to the expectations of the until then very successful quark model led to a renaissance of hadron spectroscopy. Among various explanations of the internal structure of these excitations, hadronic molecules, being analogues of light nuclei, play a unique role since for those predictions can be made with controlled uncertainty. We review experimental evidences of various candidates of hadronic molecules, and methods of identifying such structures. Nonrelativistic effective field theories are the suitable framework for studying hadronic molecules, and are discussed in both the continuum and finite volumes. Also pertinent lattice QCD results are presented. Further, we discuss the production mechanisms and decays of hadronic molecules, and comment on the reliability of certain assertions often made in the literature.

    Comments:
    Corrected several entries in Table VI for the contact terms for the S-wave interactions between the spin multiplets of D1 and Dbar; 67 pages, 23 figures
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); High Energy Physics — Lattice (hep-lat); Nuclear Theory (nucl-th)
    arXiv:
    1705.00141 [pdf]
    RMP(2018)·1678 citations
  5. 05

    [Submitted on 1 May 2017] (cross-list from hep-ph)

    Polyakov loop modeling for hot QCD

    Kenji Fukushima🇯🇵 · Vladimir Skokov🇺🇸

    We review theoretical aspects of quantum chromodynamics (QCD) at finite temperature. The most important physical variable to characterize hot QCD is the Polyakov loop, which is an approximate order parameter for quark deconfinement in a hot gluonic medium. Additionally to its role as an order parameter, the Polyakov loop has rich physical contents in both perturbative and non-perturbative sectors. This review covers a wide range of subjects associated with the Polyakov loop from topological defects in hot QCD to model building with coupling to the Polyakov loop.

    Comments:
    72 pages, 29 figures; more references added on request; published in Progress in Particle and Nuclear Physics
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Lattice (hep-lat); High Energy Physics — Theory (hep-th); Nuclear Theory (nucl-th)
    arXiv:
    1705.00718 [pdf]
    PPNP(2017)·164 citations
  6. 06

    [Submitted on 2 May 2017] (cross-list from hep-ph)

    Multiparticle collectivity from initial state correlations in high energy proton-nucleus collisions

    Kevin Dusling🇺🇸 · Mark Mace🇺🇸 · Raju Venugopalan🇺🇸

    Qualitative features of multiparticle correlations in light-heavy ion () collisions at RHIC and LHC are reproduced in a simple initial state model of partons in the projectile coherently scattering off localized domains of color charge in the heavy nuclear target. These include i) the ordering of the magnitudes of the azimuthal angle th Fourier harmonics of two-particle correlations , ii) the energy and transverse momentum dependence of the four-particle Fourier harmonic , and iii) the energy dependence of four-particle symmetric cumulants measuring correlations between different Fourier harmonics. Similar patterns are seen in an Abelian version of the model, where we observe of two, four, six, and eight particle correlations. While such patterns are often interpreted as signatures of collectivity arising from hydrodynamic flow, our results provide an alternative description of the multiparticle correlations seen in collisions.

    Comments:
    7 pages, 5 figures. v2: Discussions and references added; version accepted for publication in Phys. Rev. Letters
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    1705.00745 [pdf]
    PRL(2018)·100 citations

Affiliations

first authorsco-authorsvia INSPIRE