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Nuclear Theory·nucl-th

Friday·October 25, 2019

3 papers—1 primary·2 cross-listed

All3Primary1Cross-lists2
  1. 02

    [Submitted on 24 Oct 2019] (cross-list from hep-ph)

    Dirac sea and chiral anomaly in the quantum kinetic theory

    Jian-Hua Gao🇨🇳 · Zuo-Tang Liang🇨🇳 · Qun Wang🇨🇳

    We revisit the chiral anomaly in the quantum kinetic theory in the Wigner function formalism under the background field approximation. Our results show that the chiral anomaly is actually from the Dirac sea or the vacuum contribution in the un-normal-ordered Wigner function. We also demonstrate that this contribution modifies the chiral kinetic equation for antiparticles.

    Comments:
    7 pages, Version submitted to PRD
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Theory (hep-th); Nuclear Theory (nucl-th)
    arXiv:
    1910.11060 [pdf]
    PRD(2020)·29 citations
  2. 03

    [Submitted on 24 Oct 2019] (cross-list from nucl-ex)

    Virtual Compton Scattering and Nucleon Generalized Polarizabilities

    H.Fonvieille (1) · B.Pasquini (2)(3) · N.Sparveris (4) · ((1) Université Clermont Auvergne, CNRS/IN2P3, LPC, F-63000 Clermont-Ferrand, France, (2) Dipartimento di Fisica Nucleare e Teorica, Universitá degli Studi di Pavia, (3) Istituto Nazionale di Fisica Nucleare, Sezione di Pavia, Italy, (4) Temple University, Philadelphia, PA 19122, USA)

    This review gives an update on virtual Compton scattering (VCS) off the nucleon, , in the low-energy regime. We recall the theoretical formalism related to the generalized polarizabilities (GPs) and model predictions for these observables. We present the GP extraction methods that are used in the experiments: the approach based on the low-energy theorem for VCS and the formalism of Dispersion Relations. We then review the experimental results, with a focus on the progress brought by recent experimental data on proton generalized polarizabilities, and we conclude by some perspectives in the field of VCS at low energy.

    Comments:
    54 pages, 27 figures. To be published by: Progress in Particle and Nuclear Physics. 2020. Version #2, sent for Edition
    Subjects:
    Nuclear Experiment (nucl-ex); High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    1910.11071 [pdf]
    PPNP(2020)·23 citations

Affiliations

first authorsco-authorsvia INSPIRE