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Nuclear Theory·nucl-th

Wednesday·August 13, 2025

7 papers—4 primary·3 cross-listed

All7Primary4Cross-lists3
  1. 05

    [Submitted on 11 Aug 2025] (cross-list from hep-ph)

    Nucleon Energy Correlators as a Probe of Light-Quark Dipole Operators at the Electron-Ion Collider

    Yingsheng Huang🇨🇳 · Xuan-Bo Tong🇫🇮 · Hao-Lin Wang🇨🇳

    We propose nucleon energy correlators (NECs) as a novel framework to probe electroweak light-quark dipole operators in deep inelastic scattering with an unpolarized nucleon. These operators encode chirality-flipping interactions, whose effects are usually quadratically suppressed in unpolarized cross sections. We construct a chiral-odd quark NEC that accesses quark transverse spin via azimuthal angle asymmetries in the energy flow of the target fragmentation region. These asymmetries serve as clean and powerful observables, enabling linear constraints on the quark dipole couplings. Unlike existing methods, our approach requires neither polarized nucleon beams nor final-state hadron identification, relying instead on fully inclusive calorimetric measurements. This work establishes one of the first applications of energy correlator observables to new physics searches and opens a promising direction for precision studies of chirality-flipping effects at electron-ion colliders.

    Comments:
    8 pages (main text) plus 11 pages (supplemental material), 13 figures, 1 table; version published in PRL
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    2508.08516 [pdf]
    PRL(2026)·14 citations
  2. 06

    [Submitted on 12 Aug 2025] (cross-list from nucl-ex)

    On the High Excitation 7 De-exciting States in Si

    J. B. Natowitz · X. G. Cao · A. Bonasera · T. Depastas

    A direct comparison and analysis of published spectra for the 7 disassembly of Si projectiles excited in collisions with C at 35 MeV/u reveals significant agreement in the derived excitation energies of high excitation energy resonances observed in two different experiments, in contrast to some earlier conclusions reported in the literature. Many of the observed resonances have excitation energies consistent with those arrived at in recent theoretical investigations explicitly predicting the excitation energies and spins of toroidal nuclei. An AI-assisted application of well-established statistical filtering techniques reveals identical structures in all spectra investigated. Some additional peaks are observed. The possibility that they correspond to other favored geometries is discussed.

    Comments:
    7 pages, 4 figures, 2 tables
    Subjects:
    Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    2508.08878 [pdf]
    0 citations
  3. 07

    [Submitted on 12 Aug 2025] (cross-list from hep-ph)

    Quarkonium in a QCD medium with momentum-dependent relaxation time

    Sunny Kumar Singh🇮🇳 · Samapan Bhadury🇵🇱 · Ritesh Ghosh🇺🇸 · Manu Kurian🇮🇳

    In this study, we explore the properties of quarkonia in a hot QCD medium using a newly proposed collision kernel that consistently incorporates the particle's momentum dependence into the relaxation time scale of the medium. The longitudinal component of the gluon self-energy, along with the Debye screening mass, is computed within the one-loop hard thermal loop framework by incorporating non-equilibrium corrections. A modified kinetic theory with an extended relaxation time approximation is employed to model the non-equilibrium dynamics of the QCD medium. The sensitivity of the heavy quarkonia potential to the momentum dependence of the relaxation time is studied. Further, we studied the binding energy and thermal width of quarkonia states within this new kinetic theory. Sizable variations in the temperature behavior of these quantities are observed in comparison with the standard relaxation time approximation method due to the particle momentum dependence on the relaxation timescale of the QCD medium. Our findings highlight that accounting for the microscopic nature of the collision timescale is crucial for understanding the quarkonium behavior in a QCD medium.

    Comments:
    27 pages, 6 multi-panel figures, version accepted in Physical Review D
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Theory (hep-th); Nuclear Theory (nucl-th)
    arXiv:
    2508.09108 [pdf]
    PRD(2025)·1 citation

Affiliations

first authorsco-authorsvia INSPIRE