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Nuclear Theory·nucl-th

Wednesday·May 9, 2018

9 papers—5 primary·4 cross-listed

All9Primary5Cross-lists4
  1. 06

    [Submitted on 7 May 2018] (cross-list from hep-ph)

    Second-order Hydrodynamics in Next-to-Leading-Order QCD

    Jacopo Ghiglieri🇨🇭 · Guy D. Moore🇩🇪 · Derek Teaney🇺🇸

    We compute the hydrodynamic relaxation times and for hot QCD at next-to-leading order in the coupling with kinetic theory. We show that certain dimensionless ratios of second-order to first-order transport coefficients obey bounds which apply whenever a kinetic theory description is possible; the computed values lie somewhat above these bounds. Strongly coupled theories with holographic duals strongly violate these bounds, highlighting their distance from a quasiparticle description.

    Comments:
    5 pages, 3 figures. v2: note and reference added, version accepted for publication on Phys. Rev. Lett
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    1805.02663 [pdf]
    PRL(2018)·35 citations
  2. 07

    [Submitted on 7 May 2018] (cross-list from hep-ph)

    Particle multiplicities in the central region of high-energy collisions from -factorization with running coupling corrections

    Adrian Dumitru🇺🇸 · Andre V. Giannini🇧🇷 · Matthew Luzum🇧🇷 · Yasushi Nara🇯🇵

    Horowitz and Kovchegov have derived a -factorization formula for particle production at small which includes running coupling corrections. We perform a first numerical analysis to confront the theory with data on the energy and centrality dependence of particle multiplicities at midrapidity in high-energy p+A (and A+A) collisions. Moreover, we point out a strikingly different dependence of the multiplicity per participant on in p+Pb vs.\ Pb+Pb collisions at LHC energies, and argue that the observed behavior follows rather naturally from the convolution of the gluon distributions of an asymmetric vs. symmetric projectile and target.

    Comments:
    8 pages, 8 figures; v3: 2 new figures, matches the version accepted by Physics Letters B
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    1805.02702 [pdf]
    PLB(2018)·13 citations
  3. 08

    [Submitted on 8 May 2018] (cross-list from nucl-ex)

    Search for the Chiral Magnetic Effect in Relativistic Heavy-Ion Collisions

    Jie Zhao🇺🇸

    Relativistic heavy-ion collisions provide an ideal environment to study the emergent phenomena in quantum chromodynamics (QCD). The chiral magnetic effect (CME) is one of the most interesting, arising from the topological charge fluctuations of QCD vacua, immersed in a strong magnetic field. Since the first measurement nearly a decade ago of the possibly CME-induced charge correlation, extensive studies have been devoted to background contributions to those measurements. Many new ideas and techniques have been developed to reduce or eliminate the backgrounds. This article reviews these developments and the overall progress in the search for the CME.

    Comments:
    37 pages, 25 figures, invited review by International Journal of Modern Physics A
    Subjects:
    Nuclear Experiment (nucl-ex); High Energy Physics — Experiment (hep-ex); High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    1805.02814 [pdf]
    Int.J.Mod.Phys.A(2018)·29 citations
  4. 09

    [Submitted on 8 May 2018] (cross-list from hep-ph)

    The gluon and charm content of the deuteron

    Stanley J. Brodsky🇺🇸 · Kelly Yu-Ju Chiu🇺🇸 · Jean-Philippe Lansberg🇫🇷 · Nodoka Yamanaka🇫🇷

    We evaluate the frame-independent gluon and charm parton-distribution functions (PDFs) of the deuteron utilizing light-front quantization and the impulse approximation. We use a nuclear wave function obtained from solving the nonrelativistic Schroedinger equation with the realistic Argonne v18 nuclear force, which we fold with the proton PDF. The predicted gluon distribution in the deuteron (per nucleon) is a few percent smaller than that of the proton in the domain x_{bj} = Q^2 / (2 p_N \cdot q) \sim 0.4, whereas it is strongly enhanced for x_{bj} larger than 0.6. We discuss the applicability of our analysis and comment on how to extend it to the kinematic limit x_{bj} \to 2. We also analyze the charm distribution of the deuteron within the same approach by considering both the perturbatively and non-perturbatively generated (intrinsic) charm contributions. In particular, we note that the intrinsic-charm content in the deuteron will be enhanced due to 6-quark "hidden-color" QCD configurations.

    Comments:
    9 pages, 10 figures
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    1805.03173 [pdf]
    PLB(2018)·23 citations

Affiliations

first authorsco-authorsvia INSPIRE