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Nuclear Theory·nucl-th

Friday·September 14, 2018

8 papers—5 primary·3 cross-listed

All8Primary5Cross-lists3
  1. 06

    [Submitted on 13 Sept 2018] (cross-list from hep-ph)

    Superstatistics and the effective QCD phase diagram

    Alejandro Ayala🇲🇽 · Martin Hentschinski🇲🇽 · Luis Alberto Hernandez🇲🇽 · Marcelo Loewe🇨🇱 · Renato Zamora🇨🇱

    We study the effect of a partially thermalized scenario for chiral symmetry restoration at finite temperature and quark chemical potential, and in particular for the position of the critical end point in an effective description of the QCD phase diagram. We show that these effects produce the critical end point to be displaced towards larger values of temperature and lower values of the quark chemical potential as compared to the case when the system can be regarded as completely thermalized. We conclude that these effects may be important for relativistic heavy ion collisions where the number of subsystems making the whole interaction volume can be linked to the finite number of participants in the reaction.

    Comments:
    7 pages and 4 figures. Extended discussion. Published in PRD
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    1809.04728 [pdf]
    PRD(2018)·26 citations
  2. 07

    [Submitted on 12 Sept 2018] (cross-list from physics.data-an)

    Effect of centrality bin width corrections on two-particle number and transverse momentum differential correlation functions

    Victor Gonzalez🇪🇸 · Ana Marin🇩🇪 · Pedro Ladron de Guevara🇪🇸 · Jinjin Pan🇺🇸 · Sumit Basu🇺🇸 · Claude Pruneau🇺🇸

    Two-particle number and transverse momentum differential correlation functions are powerful tools for unveiling the detailed dynamics and particle production mechanisms involved in relativistic heavy-ion collisions. Measurements of transverse momentum correlators and , in particular, provide added information not readily accessible with better known number correlation functions . However, it is found that the and correlators are somewhat sensitive to the details of the experimental procedure used to measure them. They exhibit, in particular, a dependence on the collision centrality bin width, which may have a rather detrimental impact on their physical interpretation. A technique to correct these correlators for collision centrality bin-width averaging is presented. The technique is based on the hypothesis that the shape of single- and pair- probability densities vary slower with collision centrality than the corresponding integrated yields. The technique is tested with Pb-Pb simulations based on the HIJING and ultrarelativistic quantum molecular dynamics models and shown to enable a precision better than 1% for particles in the kinematic range GeV/.

    Comments:
    14 pages, 6 figures
    Subjects:
    Data Analysis, Statistics and Probability (physics.data-an); High Energy Physics — Experiment (hep-ex); High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    1809.04962 [pdf]
    PRC(2019)·6 citations
  3. 08

    [Submitted on 13 Sept 2018] (cross-list from hep-ph)

    Nonperturbative strange-quark sea from lattice QCD, light-front holography, and meson-baryon fluctuation models

    Raza Sabbir Sufian🇺🇸 · Tianbo Liu🇺🇸 · Guy F. de Téramond🇨🇷 · Hans Günter Dosch🇩🇪 · Stanley J. Brodsky🇺🇸 · Alexandre Deur🇺🇸 · Mohammad T. Islam🇺🇸 · Bo-Qiang Ma🇨🇳

    We demonstrate that a nonzero strangeness contribution to the spacelike electromagnetic form factor of the nucleon is evidence for a strange-antistrange asymmetry in the nucleon's light-front wave function, thus implying different nonperturbative contributions to the strange and antistrange quark distribution functions. A recent lattice QCD calculation of the nucleon strange quark form factor predicts that the strange quark distribution is more centralized in coordinate space than the antistrange quark distribution, and thus the strange quark distribution is more spread out in light-front momentum space. We show that the lattice prediction implies that the difference between the strange and antistrange parton distribution functions, , is negative at small- and positive at large-. We also evaluate the strange quark form factor and using a baryon-meson fluctuation model and a novel nonperturbative model based on light-front holographic QCD. This procedure leads to a Veneziano-like expression of the form factor, which depends exclusively on the twist of the hadron and the properties of the Regge trajectory of the vector meson which couples to the quark current in the hadron. The holographic structure of the model allows us to introduce unambiguously quark masses in the form factors and quark distributions preserving the hard scattering counting rule at large- and the inclusive counting rule at large-. Quark masses modify the Regge intercept which governs the small- behavior of quark distributions, therefore modifying their small- singular behavior. Both nonperturbative approaches provide descriptions of the strange-antistrange asymmetry and intrinsic strangeness in the nucleon consistent with the lattice QCD result.

    Comments:
    31 pages, 8 figures, version to appear in Physical Review D
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); High Energy Physics — Lattice (hep-lat); Nuclear Theory (nucl-th)
    arXiv:
    1809.04975 [pdf]
    PRD(2018)·44 citations

Affiliations

first authorsco-authorsvia INSPIRE