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Nuclear Theory·nucl-th

Monday·June 30, 2025

13 papers—5 primary·8 cross-listed

All13Primary5Cross-lists8
  1. 01

    [Submitted on 26 Jun 2025]

    Four types of phase transitions in interacting boson (meson) matter at high temperatures

    D. Anchishkin🇺🇦 · V. Gnatovskyy🇺🇦 · D. Zhuravel🇺🇦 · I. Mishustin🇩🇪 · H. Stoecker🇩🇪

    The thermodynamics of the interacting system of relativistic particles and antiparticles in the presence of a Bose-Einstein condensate was investigated within the framework of the mean-field model. It is assumed that the total isospin (charge) density is conserved. We show that, depending on the strength of the interaction, a bosonic particle-antiparticle system exhibits four types of phase transitions to the condensate phase. Three types correspond to the second-order phase transition, while one is a first-order phase transition.

    Comments:
    13 pages, 14 figures
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Theory (hep-th); Quantum Physics (quant-ph)
    arXiv:
    2506.21736 [pdf]
    J.Subatomic Part.Cosmol.(2025)·1 citation
  2. 02

    [Submitted on 27 Jun 2025]

    Kinetic theories: from curved space to flat space

    Shu Lin🇨🇳

    We generalize the equivalence between off-equilibrium state and gravitational perturbation of equilibrium state from dynamics of macroscopic quantities to that of microscopic particles. We also generalize the equivalence to incorporate off-equilibrium state with vorticity by torsional perturbation to equilibrium state. The equivalence is achieved by mapping kinetic theories of spinless and spinning particles in torsional curved space to flat space through suitable choice of inertial frame that eliminates geodesic forces on particles. The equivalence has been shown for hydrodynamic and elastic regimes. In the latter case, we predict spin polarization induced by time-variation of shear strain in elastic materials. We also provide an order-of-magnitude estimate for the polarization in Dirac semi-metal.

    Comments:
    10 pages. added: kinetic theories in torsional background, relativistic generalization of the elastic case
    Subjects:
    Nuclear Theory (nucl-th); Mesoscale and Nanoscale Physics (cond-mat.mes-hall); General Relativity and Quantum Cosmology (gr-qc); High Energy Physics — Phenomenology (hep-ph)
    arXiv:
    2506.21890 [pdf]
    PRD(2026)·0 citations
  3. 03

    [Submitted on 27 Jun 2025]

    Nucleon-Quark Diquark-exchange Interaction

    Th.A. Rijken🇳🇱

    In this note the nucleon-quark diquark-exchange interaction is derived using the Feynman-propagator for axial-vector diquark (D) exchange. The Feynman diquark propagator is derived and the result is a (-)-sign difference w.r.t. quark-antiquark exchange. This is due to the (-)-sign for a closed fermion loop, present in for example vector and axial-vector quark-antiquark exchange, but absent in the case of D-exchange. The calculations in these notes follow closely those for vacuum polarisation in the literature. Taking into account that the diquark D is a color \left{\bar{3}_c\right\}-state giving a factor +2. The result is an effective axial-vector diquark propagator. Application to gives a repulsive potential, which has been used in mixed nuclear-quark matter calculation.

    Comments:
    19 pages, 6 figures
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph)
    arXiv:
    2506.22079 [pdf]
    0 citations
  4. 04

    [Submitted on 27 Jun 2025]

    Spin polarization from nucleon-nucleon scatterings in intermediate-energy heavy-ion collisions

    Rong-Jun Liu🇨🇳 · Jun Xu🇨🇳 · Yu-Gang Ma🇨🇳

    We propose a new mechanism of generating spin polarization in heavy-ion collisions dominated by nucleon degree of freedom. By incorporating the spin change in nucleon-nucleon scatterings based on the phase shift data together with the constraint of rigorous angular momentum conservation and Pauli blocking, we illustrate through a Boltzmann-Uehling-Uhlenbeck transport model that appreciable spin polarization (about ) can be generated in intermediate-energy heavy-ion collisions. This mechanism, together with the nuclear spin-orbit potential, may help to understand the spin polarization in few-GeV heavy-ion collisions dominated by nucleon degree of freedom.

    Comments:
    6 pages, 4 figures
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Experiment (hep-ex); Nuclear Experiment (nucl-ex)
    arXiv:
    2506.22247 [pdf]
    PLB(2025)·4 citations
  5. 05

    [Submitted on 27 Jun 2025]

    Exploring hadronic rescattering effects on resonance productions in pp and p-Pb collisions with PYTHIA8

    Su-Jeong Ji🇰🇷 · Gyeongbin Park🇰🇷 · Bong-Hwi Lim🇯🇵 · Sanghoon Lim🇰🇷

    In relativistic heavy-ion collisions, the quark-gluon plasma is created, and as the medium cools down, the system transitions into a hadronic phase. While such interactions are well established for large systems, such as Pb-Pb collisions, their relevance in smaller collision systems remains unclear. Consequently, hadronic interactions during the hadronic phase are studied in pp collisions at TeV and p-Pb collisions at TeV with the PYTHIA8 event generator. The interaction is studied via the yield ratios between resonances and stable particles with similar quark contents, which are obtained as a function of transverse momentum () using , , and mesons and their stable particles, and at midrapidity (). Yield ratios are calculated in five multiplicity classes for pp and six for p-Pb collisions, using the 60-100% multiplicity class in pp as a reference. Although rescattering leads to stronger suppression at low GeV/, a visible suppression remains even when rescattering is turned off. To isolate the rescattering effect, double ratios between the rescattering on and off configurations are obtained. These are then integrated in the full range ( GeV/). The normalized double ratios show a decreasing trend with increasing multiplicity, independent of the collision system. The lower limit of the hadronic phase lifetimes extracted in the integrated- region increases with multiplicity in both systems, but with a notable discrepancy between pp and p-Pb collisions.

    Comments:
    12 pages, 10 figures
    Subjects:
    Nuclear Theory (nucl-th); Nuclear Experiment (nucl-ex)
    arXiv:
    2506.22368 [pdf]
    NPA(2026)·1 citation

Affiliations

first authorsco-authorsvia INSPIRE