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Nuclear Theory·nucl-th

Monday·April 9, 2018

5 papers—3 primary·2 cross-listed

All5Primary3Cross-lists2
  1. 04

    [Submitted on 5 Apr 2018] (cross-list from hep-ph)

    First Monte Carlo global QCD analysis of pion parton distributions

    P. C. Barry🇺🇸 · N. Sato🇺🇸 · W. Melnitchouk🇺🇸 · Chueng-Ryong Ji🇺🇸

    We perform the first global QCD analysis of parton distribution functions (PDFs) in the pion, combining Drell-Yan data with leading neutron electroproduction from HERA within a Monte Carlo approach based on nested sampling. Inclusion of the HERA data allows the pion PDFs to be determined down to much lower values of , with relatively weak model dependence from uncertainties in the chiral splitting function. The combined analysis reveals that gluons carry a significantly higher pion momentum fraction, , than that inferred from Drell-Yan data alone, with sea quarks carrying a somewhat smaller fraction, , at the input scale. Within the same effective theory framework, the chiral splitting function and pion PDFs can be used to describe the asymmetry in the proton.

    Comments:
    This article will appear in Physical Review Letters; 4 figures
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Theory (nucl-th)
    arXiv:
    1804.01965 [pdf]
    PRL(2018)·198 citations
  2. 05

    [Submitted on 5 Apr 2018] (cross-list from hep-lat)

    Implicit schemes for real-time lattice gauge theory

    Andreas Ipp🇦🇹 · David Müller🇦🇹

    We develop new gauge-covariant implicit numerical schemes for classical real-time lattice gauge theory. A new semi-implicit scheme is used to cure a numerical instability encountered in three-dimensional classical Yang-Mills simulations of heavy-ion collisions by allowing for wave propagation along one lattice direction free of numerical dispersion. We show that the scheme is gauge covariant and that the Gauss constraint is conserved even for large time steps.

    Comments:
    47 pages, 6 figures
    Subjects:
    High Energy Physics — Lattice (hep-lat); High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    1804.01995 [pdf]
    EPJC(2018)·22 citations

Affiliations

first authorsco-authorsvia INSPIRE