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Nuclear Theory·nucl-th

Thursday·February 5, 2026

8 papers—5 primary·3 cross-listed

All8Primary5Cross-lists3
  1. 06

    [Submitted on 3 Feb 2026] (cross-list from hep-ph)

    Emergent equilibrium-like yields from nonequilibrium cascade dynamics

    Takeshi Fukuyama🇯🇵

    We study nonequilibrium cascades in which fragile bound or coherent structures are formed through intermediate states rather than by direct equilibration. Motivated by light-nuclei production in relativistic heavy-ion collisions and by Bose--Einstein condensation in cosmological settings, we analyze such processes within the Schwinger--Keldysh real-time formalism. We show that commonly used rate equations can be understood as a controlled Markovian approximation obtained by integrating out intermediate reservoirs in an underlying multi-component nonequilibrium dynamics. When the finite lifetime of these reservoirs is retained, non-Markovian memory effects naturally appear, leading to delayed and history-dependent formation dynamics. The associated memory time provides a quantitative criterion for the validity of reduced, rate-based descriptions far from equilibrium.

    Comments:
    9 pages, no figure
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    2602.04040 [pdf]
    PRC(2026)·0 citations
  2. 07

    [Submitted on 3 Feb 2026] (cross-list from hep-ph)

    Disentangling baryon stopping and neutron skin effects in heavy-ion collisions

    Grégoire Pihan🇺🇸 · Volodymyr Vovchenko🇺🇸

    We analyse the net baryon (B) and net electric charge (Q) stopping in heavy-ion collisions using the statistical model. Focusing first on isobar collisions and at ~GeV, we show that the excess baryon-stopping parameter can be quantitatively extracted from forthcoming RHIC measurements of charge- and baryon-stopping ratios. We then generalize the approach to other collision systems at RHIC and LHC energies and introduce an oxygen-baseline observable, , whose central-to-peripheral ratio exhibits strong and systematic sensitivity to the neutron-skin thickness of the target nucleus .

    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    2602.04079 [pdf]
    2 citations
  3. 08

    [Submitted on 3 Feb 2026] (cross-list from hep-ph)

    Charmonium, exotic hadrons and hadron structure

    Bing-Song Zou🇨🇳

    To celebrate the 50th anniversary of the discovery of the J/{\psi}, the first charmonium state observed, I start with a brief review of major progresses on the QCD inspired quark potential model originated from charmonium spectrum.Then I show the importance of unquenching dynamics, multiquark components and exotic multiquark states for understanding hadron structure and hadron spectrscopy. The J/{\psi} and charmonium-like states have played an important role in this aspect.

    Comments:
    Talk at the International Symposium of "50 Years Discovery of the J Particle", Beijing, October 20, 2024
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    2602.04090 [pdf]
    NPB(2026)·2 citations

Affiliations

first authorsco-authorsvia INSPIRE