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Nuclear Theory·nucl-th

Monday·September 29, 2025

6 papers—3 primary·3 cross-listed

All6Primary3Cross-lists3
  1. 04

    [Submitted on 25 Sept 2025] (cross-list from astro-ph.HE)

    Stochastic analysis of ultra-high energy cosmic ray interactions

    Leonel Morejon🇩🇪 · Karl-Heinz Kampert🇩🇪

    Photonuclear interactions between ultra-high-energy cosmic ray (UHECR) nuclei and surrounding photon fields are key to understanding the connection between the compositions observed at Earth and those emitted from the sources. These interactions can completely disintegrate a nucleus of iron over trajectory lengths of a few and up to hundreds of megaparsecs, depending on the energy of the UHECR. The stochastic nature of these interactions means that it is not possible to describe them deterministically for a single cosmic ray, and an exact formulation of the probability distributions is not yet available. Current approaches describe these interactions using either Monte Carlo simulations or solving ordinary differential equations that neglect stochasticity. Because of the limitations of these approaches, only partial capture of the process is achieved. This paper presents an analytic probabilistic description of UHECR interactions and the resulting nuclear cascades, establishing their connection to Markov jump processes. The fundamental properties of these cascades are presented, as is the computation of the usual quantities of interest, such as the horizon, spectrum, and composition. The benefits of this description are outlined using astrophysical examples related to extragalactic propagation and UHECR sources.

    Comments:
    Accepted for publication in Astronomy & Astrophysics (A&A)
    Subjects:
    High Energy Astrophysical Phenomena (astro-ph.HE); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    2509.21461 [pdf]
    Astron.Astrophys.(2026)·1 citation
  2. 05

    [Submitted on 26 Sept 2025] (cross-list from hep-ph)

    Dynamical gluon effects in the three-dimensional structure of pion

    Jiangshan Lan🇨🇳 · Kaiyu Fu🇨🇳 · Satvir Kaur🇨🇳 · Zhimin Zhu🇨🇳 · Chandan Mondal🇨🇳 · Xingbo Zhao🇨🇳 · James P. Vary🇺🇸

    We investigate the internal structure of the pion, including the contributions from one dynamical gluon, using the basis light-front quantization (BLFQ) approach. By solving a light-front QCD Hamiltonian with a three-dimensional confining potential, we obtain the light-front wavefunctions (LFWFs) for both the quark-antiquark and quark-antiquark-gluon Fock sectors. These wavefunctions are then employed to compute the unpolarized generalized parton distributions (GPDs) and the transverse-momentum-dependent parton distributions (TMDs) of valence quarks and gluons. We also extract the transverse spatial distributions, providing the squared radii of quark and gluon densities in the impact-parameter space. This work contributes toward a three-dimensional understanding of the pion's internal structure in both momentum and coordinate space.

    Comments:
    23 pages, 9 figures
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Theory (hep-th); Nuclear Theory (nucl-th)
    arXiv:
    2509.22016 [pdf]
    PRD(2026)·3 citations
  3. 06

    [Submitted on 26 Sept 2025] (cross-list from hep-ph)

    Recent progress in modeling neutrino-nucleus interactions for oscillation experiments

    Maria B. Barbaro🇮🇹

    The analysis of accelerator-based neutrino experiments crucially depends on the good control of nuclear effects in the neutrino interactions with the detectors. Recently the focus of both experimental measurements and theoretical studies has moved from the inclusive channel, where only the final lepton is detected, to the more challenging semi-inclusive reactions, where one or more hadrons are detected in coincidence with the lepton. In this contribution we present our recent research of the semi-inclusive reaction on carbon for the quasielastic and the two-particle-two-hole channels. We show some representative results and their comparison with experimental data, illustrating the robustness of the theoretical approach and discussing possible improvements to the model.

    Comments:
    6 pages, 3 figures. Submitted to MAYORANA (2025) conference proceedings
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    2509.22371 [pdf]
    Nuovo Cim.C(2026)·0 citations

Affiliations

first authorsco-authorsvia INSPIRE