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Nuclear Theory·nucl-th

Friday·July 4, 2025

11 papers—7 primary·4 cross-listed

All11Primary7Cross-lists4
  1. 08

    [Submitted on 3 Jul 2025] (cross-list from hep-ph)

    Non-Abelian chiral kinetic theory with self-consistent semiclassical expansion

    Xiao-Li Luo🇨🇳 · Shu-Xiang Ma🇨🇳 · Jian-Hua Gao🇨🇳

    We derive the chiral kinetic theory in a non-Abelian gauge field using a self-consistent semiclassical expansion. Within this new expansion scheme, we disentangle the Wigner equations up to second order and demonstrate that they do not introduce additional constraint equations. By integrating the covariant chiral kinetic equations in eight-dimensional phase space, we obtain the corresponding equations in seven-dimensional phase space. This reduction facilitates numerical simulations and practical applications.

    Comments:
    24 pages, no figures, typos corrected
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Theory (hep-th); Nuclear Theory (nucl-th)
    arXiv:
    2507.02370 [pdf]
    JHEP(2026)·1 citation
  2. 09

    [Submitted on 3 Jul 2025] (cross-list from hep-ph)

    Matching from quark to hadronic operators: external source vs spurion methods

    Gang Li🇨🇳 · Chuan-Qiang Song🇨🇳 · Jiang-Hao Yu🇨🇳

    Various weak processes at the hadronic scale have been utilized to search for new physics at high energy scale, which can be described by the QCD chiral Lagrangian matched from the low-energy effective theory (LEFT). Utilizing the chiral symmetry at the quark and hadronic levels, we make a comprehensive comparison of various matching methods, including the external source method, conventional spurion method, and our systematic spurion method. Although different methods show agreements for dimension-6 LEFT operator matching, we find that for higher-dimensional operators, the external source method is quite limited or inapplicable, the conventional spurion methods needs to introduce more and more spurions, while our spurion method does not need to introduce any new spurions than the ones in the dimension-6 matching. Using minimal set of spurions, we thus establish an one-to-one correspondence between the LEFT and chiral operators, with several examples, such as derivative operators at dimensions 7 and 8 with a single bilinear, four-quark operators at the dimension-9 level with two quark bilinears, which can be applied to the study of neutrino/electron scatterings and neutrinoless double beta decay.

    Comments:
    v1: 51 pages, 9 tables. v2: added discussions on relations of LECs for chiral operators in the systematic spurion method; matches the published version in JHEP
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    2507.02538 [pdf]
    JHEP(2026)·2 citations
  3. 10

    [Submitted on 3 Jul 2025] (cross-list from hep-ph)

    Constraining color-charge effects of partonic energy loss with jet axis-based inclusive jet substructure measurement

    Raghunath Pradhan🇺🇸 · Olga Evdokimov🇺🇸

    This study investigates the color-charge dependence of parton energy loss in the quark-gluon plasma (QGP) medium and the associated relative modifications of quark and gluon jet fractions compared to vacuum, using jet axis decorrelation observables. Recent CMS jet axis decorrelation measurements in PbPb collisions at 5.02 TeV are interpreted using Pythia simulations with varied quark/gluon jet compositions and emulated color-charge dependent energy loss. A template-fit procedure is employed to estimate the limits on gluon jet fractions in the published CMS data and average shift in jet momentum due to quenching for quark- and gluon-initiated jets traversing the QGP. The extracted gluon jet fractions and the estimated quark and gluon energy losses based on this study of jet axis decorrelations are found to be consistent with other model calculations based on inclusive observables. This work illustrates the use of jet substructure measurements for providing constraints on the color-charge dependence of parton energy loss and offers valuable insights for jet quenching models.

    Comments:
    14 pages, 7 figures
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    2507.02725 [pdf]
    PRC(2025)·0 citations
  4. 11

    [Submitted on 3 Jul 2025] (cross-list from hep-th)

    Experimentally accessible drive-induced attractor in a Fermi gas near unitarity

    Michal P. Heller🇧🇪 · Clemens Werthmann🇧🇪

    Hydrodynamic attractors describe loss of sensitivity to initial conditions. Their earliest, expansion-driven stage is distinct from the later relaxation-driven mechanism and central to the theoretical paradigm but hard to access in heavy-ion collision experiments. We show within a coupled energy-bulk-pressure model that a near-unitary Fermi gas driven by a rapid scattering-length sweep loses sensitivity to one state-space direction before bulk relaxation sets in -- visible only in the joint state space, not as a universal single-variable curve. We outline an experimental K protocol based on time-resolved contact measurements and a varied-ramp comparison.

    Comments:
    8 pages, 3 figures. v2: Corrected formula for energy density, adapted to theoretical model data for contact and bulk viscosity to extend validity to lower temperatures. Several minor changes v3: Major revision of the presentation and framing. Added experimental protocol to End Matter and Fig.4 and discussion to Supplemental Material
    Subjects:
    High Energy Physics — Theory (hep-th); Quantum Gases (cond-mat.quant-gas); High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    2507.02838 [pdf]
    5 citations

Affiliations

first authorsco-authorsvia INSPIRE