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Nuclear Theory·nucl-th

Wednesday·January 5, 2022

6 papers—4 primary·2 cross-listed

All6Primary4Cross-lists2
  1. 05

    [Submitted on 3 Jan 2022] (cross-list from hep-ph)

    Emergence of pion parton distributions

    Z.-F. Cui🇨🇳 · M. Ding🇩🇪 · J. M. Morgado🇪🇸 · K. Raya🇪🇸 · D. Binosi🇮🇹 · L. Chang🇨🇳 · F. De Soto🇪🇸 · C. D. Roberts🇨🇳 · J. Rodríguez-Quintero🇪🇸 · S. M. Schmidt🇩🇪

    Supposing only that there is an effective charge which defines an evolution scheme for parton distribution functions (DFs) that is all-orders exact, strict lower and upper bounds on all Mellin moments of the valence-quark DFs of pion-like systems are derived. Exploiting contemporary results from numerical simulations of lattice-regularised quantum chromodynamics (QCD) that are consistent with these bounds, parameter-free predictions for pion valence, glue, and sea DFs are obtained. The form of the valence-quark DF at large values of the light-front momentum fraction is consistent with predictions derived using the QCD-prescribed behaviour of the pion wave function.

    Comments:
    8 pages, 5 figures, 1 table
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); High Energy Physics — Lattice (hep-lat); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    2201.00884 [pdf]
    PRD(2022)·51 citations
  2. 06

    [Submitted on 3 Jan 2022] (cross-list from hep-lat)

    Lattice simulations of the QCD chiral transition at real

    Attila Pasztor🇭🇺 · Szabolcs Borsanyi🇩🇪 · Zoltan Fodor🇭🇺 · Matteo Giordano🇭🇺 · Sandor D. Katz🇭🇺 · Daniel Nogradi🇭🇺 · Chik Him Wong🇩🇪

    Most lattice studies of hot and dense QCD matter rely on extrapolation from zero or imaginary chemical potentials. The ill-posedness of numerical analytic continuation puts severe limitations on the reliability of such methods. We studied the QCD chiral transition at finite real baryon density with the more direct sign reweighting approach. We simulate up to a baryochemical potential-temperature ratio of , covering the RHIC Beam Energy Scan range, and penetrating the region where methods based on analytic continuation are unpredictive.This opens up a new window to study QCD matter at finite from first principles.

    Comments:
    10 pages, 3 figures; Contribution to the XXXIII International (ONLINE) Workshop on High Energy Physics "Hard Problems of Hadron Physics: Non-Perturbative QCD & Related Quests"; Based on 2108.09213 [hep-lat]. arXiv admin note: substantial text overlap with arXiv:2112.02134
    Subjects:
    High Energy Physics — Lattice (hep-lat); High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    2201.00887 [pdf]
    SciPost Phys.Proc.(2022)·0 citations

Affiliations

first authorsco-authorsvia INSPIRE