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Nuclear Theory·nucl-th

Thursday·January 28, 2016

4 papers—2 primary·2 cross-listed

All4Primary2Cross-lists2
  1. 03

    [Submitted on 26 Jan 2016] (cross-list from hep-ph)

    Electron Beam Single-Spin Asymmetries in the Resonance Region with Final Hadrons Observed

    Brandon Buncher🇺🇸 · Carl E. Carlson (William and Mary)🇺🇸

    We study beam-transverse and normal single-spin asymmetry for electron-proton inelastic scattering in the resonance region for the case where a pion is observed in the final state. There is no beam single-spin asymmetry if the observed particle has single-photon exchange as its only interaction, but this is naturally circumvented when one observes a strongly interacting final state particle. The asymmetries are not large as there is an electron mass divided by momentum transfer suppression. We present results for the cases where the final electron and a pion are both observed, with asymmetries of order tens of ppm, and where only a final pion is observed, with asymmetries of order one ppm.

    Comments:
    7 pages, 5 figures
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    1601.07199 [pdf]
    PRD(2016)·3 citations
  2. 04

    [Submitted on 27 Jan 2016] (cross-list from hep-ph)

    Off-equilibrium sphaleron transitions in the Glasma

    M. Mace🇺🇸 · S. Schlichting🇺🇸 · R. Venugopalan🇺🇸

    We perform first classical-statistical real time lattice simulations of topological transitions in the non-equilibrium Glasma of weakly coupled but highly occupied gauge fields created immediately after the collision of ultra-relativistic nuclei. Simplifying our description by employing SU(2) gauge fields, and neglecting their longitudinal expansion, we find that the rate of topological transitions is initially strongly enhanced relative to the thermal sphaleron transition rate and decays with time during the thermalization process. Qualitative features of the time dependence of this non-equilibrium transition rate can be understood when expressed in terms of the magnetic screening length, which we also extract non-perturbatively. A detailed investigation of auto-correlation functions of the Chern-Simons number () reveals non-Markovian features of the evolution distinct from previous simulations of non-Abelian plasmas in thermal equilibrium.

    Comments:
    22 pages, 22 figures, 2 tables. v2: minor modifications, references added. To appear in Physical Review D
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Theory (hep-th); Nuclear Theory (nucl-th)
    arXiv:
    1601.07342 [pdf]
    PRD(2016)·100 citations

Affiliations

first authorsco-authorsvia INSPIRE