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Nuclear Theory·nucl-th

Monday·January 20, 2025

7 papers—3 primary·4 cross-listed

All7Primary3Cross-lists4
  1. 01

    [Submitted on 16 Jan 2025]

    and potentials in neutron stars, hypernuclei, and heavy-ion collisions

    Asanosuke Jinno🇯🇵 · Koichi Murase🇯🇵 · Yasushi Nara🇯🇵

    With an appropriate force, the single-particle potential ( potential) can be made strongly repulsive at high density, and one can solve the hyperon puzzle of neutron stars. We investigate the consistency of such a potential, evaluated recently from and forces based on chiral effective field theory, with hypernuclear data and heavy-ion collision data. It is found that model calculations with such a potential can reproduce the data of the hypernuclear spectroscopy and the directed flow in heavy-ion collisions. Also, we evaluate the potential, which can be calculated by using the same hyperon forces as for the potential. Specifically, we show that the low-energy constants characterizing the strength of the force can be chosen to suppress the appearance of the 's in neutron stars while at the same time the empirical value of the potential is reproduced.

    Comments:
    8 pages, 4 figures, 1 table, Submitted to Proceedings of International Conference on Exotic Atoms and Related Topics and Conference on Low Energy Antiprotons (EXA/LEAP2024)
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2501.09881 [pdf]
    PoS(2025)·3 citations
  2. 02

    [Submitted on 17 Jan 2025]

    Nuclear equation of state at finite using deep learning assisted quasi-parton model

    Fu-Peng Li🇨🇳 · Long-Gang Pang🇨🇳 · Guang-You Qin🇨🇳

    To accurately determine the nuclear equation of state (EoS) at finite baryon chemical potential () remains a challenging yet essential goal in the study of QCD matter under extreme conditions. In this study, we develop a deep learning assisted quasi-parton model, which utilizes three deep neural networks, to reconstruct the QCD EoS at zero and predict the EoS and transport coefficient at finite . The EoS derived from our quasi-parton model shows excellent agreement with lattice QCD results obtained using Taylor expansion techniques. The minimum value of is found to be approximately 175 MeV and decreases with increasing chemical potential within the confidence interval. This model not only provides a robust framework for understanding the properties of the QCD EoS at finite but also offers critical input for relativistic hydrodynamic simulations of nuclear matter produced in heavy-ion collisions by the RHIC beam energy scan program.

    Comments:
    7 pages, 8 figures
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph)
    arXiv:
    2501.10012 [pdf]
    PLB(2025)·11 citations
  3. 03

    [Submitted on 17 Jan 2025]

    From QCD phenomenology to nuclear physics phenomenology: the chiral confining model

    Guy Chanfray🇫🇷 · Magda Ericson🇫🇷 · Hubert Hansen🇫🇷 · Jérôme Margueron🇺🇸 · Marco Martini🇫🇷

    We present a theoretical framework allowing to make an explicit connection between the phenomenology of QCD, namely the properties of the gluon correlator and Wilson loops, and a particular relativistic model for the description of nuclear matter and neutron stars, the chiral confining model. Starting with the Field Correlator Method, which incorporates explicitly and simultaneously confinement and chiral symmetry breaking, we describe how to obtain the response of the composite nucleon to the nuclear scalar field, the relative role of confinement and chiral symmetry breaking in the in-medium nucleon mass evolution, generating the three-body forces needed for the saturation mechanism.

    Comments:
    57 pages, 2 figures
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph)
    arXiv:
    2501.10177 [pdf]
    Symmetry(2025)·4 citations
  4. 04

    [Submitted on 17 Jan 2025] (cross-list from hep-ph)

    Coupled-channel formalism

    José Antonio Oller🇪🇸

    This article provides a pedagogical exploration of coupled-channel scattering in hadronic physics, focusing on theoretical methodologies, and practical applications. It covers key concepts such as the method, Castillejo-Dalitz-Dyson poles, and the generalization of these techniques to coupled channels. The article also presents a parameterization for partial wave amplitudes, ensuring unitarity and analyticity, and addresses scattering near the threshold of dominant channels, with use also of the Lippmann-Schwinger equation. Additionally, it explores final-state interactions, Omnès and Muskhelishvily solutions, the Khuri-Treiman approach, and the two-potential model for resonant event distributions, highlighting the role of Riemann sheets in resonance behavior. These methods are also applicable to related fields like nuclear and atomic physics.

    Comments:
    28 pages, 6 figures, commissioned article for the Encyclopedia of Particle Physics
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    2501.10000 [pdf]
    8 citations
  5. 05

    [Submitted on 17 Jan 2025] (cross-list from hep-ph)

    Gluon skewed generalized parton distributions of proton from a light-front Hamiltonian approach

    Pengxiang Zhang🇨🇳 · Yiping Liu🇨🇳 · Siqi Xu🇨🇳 · Chandan Mondal🇨🇳 · Xingbo Zhao🇨🇳 · James P. Vary🇺🇸

    We calculate all leading-twist gluon generalized parton distributions (GPDs) inside the proton at nonzero skewness using the basis light-front quantization framework. The proton's light-front wave functions are derived from a light-front quantized Hamiltonian incorporating Quantum Chromodynamics inputs. Our results show that the qualitative behaviors of the GPDs are consistent with those from other theoretical calculations. Additionally, we analyze the GPDs in the boost-invariant longitudinal coordinate, , which serves as the Fourier conjugate of the skewness. The GPDs in -space exhibit diffraction patterns, reminiscent of optical wave diffraction.

    Comments:
    11 pages, 3 figures, and 1 table
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Theory (hep-th); Nuclear Theory (nucl-th)
    arXiv:
    2501.10119 [pdf]
    PLB(2025)·11 citations
  6. 06

    [Submitted on 17 Jan 2025] (cross-list from hep-ph)

    Pauli principle forbids bound states

    H. Garcilazo🇲🇽 · A. Valcarce🇪🇸

    Lattice QCD studies have shown the attractive character of the , , interaction, predicting deeply bound states as the mass of the heavy quark increases. This has led to the question of the possible existence of bound states of more than two baryons, in particular bound states. We discuss how these states might not exist in nature in any flavor sector. The reason would be due to the simultaneous action of two consequences of the Pauli principle in the different partial waves: one at the baryon level, affecting the partial wave, and the other due to the quark substructure, affecting the partial wave.

    Comments:
    15 pages, 2 figures, to appear in Phys. Rev. D
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    2501.10276 [pdf]
    PRD(2025)·1 citation
  7. 07

    [Submitted on 17 Jan 2025] (cross-list from hep-ph)

    tribaryons

    H. Garcilazo🇲🇽 · A. Valcarce🇪🇸

    We study the possible existence of bound states of three baryons. We consider only wave interactions and we start from recent lattice QCD results which give a strongly attractive potential between two baryons in the channel. We analyze different scenarios. At baryonic level, the interaction could be understood to be basically spin-independent, so that the two contributing channels, and , would have a very similar interaction. This baryonic analysis leads to the existence of bound states in the three-body system. At the quark level, repulsive effects would appear in the channel, making it more repulsive than the channel. We study the effect of such repulsion in terms of its range.

    Comments:
    9 pages, 2 figures
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    2501.10281 [pdf]
    Rev.Mex.Fis.(2024)·3 citations

Affiliations

first authorsco-authorsvia INSPIRE