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Nuclear Theory·nucl-th

Monday·January 27, 2025

7 papers—4 primary·3 cross-listed

All7Primary4Cross-lists3
  1. 01

    [Submitted on 24 Jan 2025]

    Theoretical study of the cusp in the reaction

    Shunsuke Yasunaga🇯🇵 · Daisuke Jido🇯🇵

    The reaction is useful for exploring the hyperon-nucleon interaction through final state interactions. In particular, the cusp structure of the invariant mass spectrum at the threshold contains information about the s-wave interaction of 1/2-isospin hyperon-nucleon systems. The calculation of the spectrum is performed with the aim of extracting the scattering length of the channel that couples to the channel from this reaction, and the results are discussed in comparison with experimental data to highlight the factors that should be considered.

    Comments:
    6 pages, 3 figures, 1 table. Contribution to the proceedings of the 10th International Conference on Quarks and Nuclear Physics (QNP2024)
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph)
    arXiv:
    2501.14227 [pdf]
    PoS(2025)·1 citation
  2. 02

    [Submitted on 24 Jan 2025]

    Longitudinal flow decorrelations in light ion collisions

    Hadi Mehrabpour🇨🇳 · Abhisek Saha🇨🇳

    This study presents a detailed analysis of longitudinal flow decorrelations in light ion collisions at Relativistic Heavy Ion Collider (RHIC) and Large Hadron Collider(LHC) energies for the first time. We compare different theoretical models of the oxygen structure and find that certain observables, such as the flow vector correlator, can distinguish between them, particularly highlighting differences between the variational Monte Carlo (VMC) structure and other models, such as Nuclear Lattice Effective Field Theory (NLEFT) and the Projected Generator Coordinate Method (PGCM), which behave similarly. We further examine flow decorrelations across different systems, including d+Au and O+O collisions at 200 GeV, as well as Ne+Ne and O+O collisions at 6.37 TeV, indicating a hierarchy in decorrelations that underscores the complexity of these interactions. Our findings emphasize that the role of asymmetry in d+Au collisions and its impact on flow correlations is mitigated using a modified flow correlation defined as a ratio of two flow vector covariances derived from different pairs of pseudorapidity bins. Additionally, our analysis of flow angle decorrelations shows diverse distributions across various systems, finding distinct patterns in d+Au collisions compared to other collision systems.

    Comments:
    12 pages, 11 figures
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex)
    arXiv:
    2501.14243 [pdf]
    EPJC(2025)·6 citations
  3. 03

    [Submitted on 24 Jan 2025]

    QED corrections to the parity-violating asymmetry in high-energy electron-nucleus collisions

    Xavier Roca-Maza🇪🇸 · D H. Jakubassa-Amundsen🇩🇪

    The parity-violating asymmetry, including leading-order QED corrections to the Coulomb potential, is calculated non-perturbatively by solving the Dirac equation. At GeV collision energies and forward scattering angles, QED effects enhance the asymmetry by approximately 5% for the recently measured nuclei 27Al, 48Ca, and 208Pb. The corrections result in a shift of the estimated neutron radius, leading to an increase in the inferred neutron skin thicknesses of these nuclei and, thus, to the pressure neutrons feel around nuclear saturation density.

    Subjects:
    Nuclear Theory (nucl-th); Nuclear Experiment (nucl-ex)
    arXiv:
    2501.14375 [pdf]
    PRL(2025)·16 citations
  4. 04

    [Submitted on 24 Jan 2025]

    Level shifts of exotic deuterium atoms from effective range parameters

    Pierre-Yves Duerinck🇧🇪 · Rimantas Lazauskas🇫🇷 · Jérémy Dohet-Eraly🇧🇪

    We discuss various methods for determining the level shifts induced by short-range interactions in exotic atoms which are formed by a hadron and a nucleus of opposite charge. The energy shifts can be related to the effective range parameters through Deser or Trueman formulas. In order to assess the accuracy and the reliability of this indirect approach, its predictions are compared with direct bound-state calculations. Notably, the importance of including the Coulomb potential in scattering calculations is highlighted. Finally, the impact of multipole terms in the asymptotic electromagnetic interaction is examined. It is demonstrated that an indirect approach remains relevant by accounting for these effects perturbatively.

    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2501.14407 [pdf]
    PRC(2025)·4 citations

Affiliations

first authorsco-authorsvia INSPIRE