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Nuclear Theory·nucl-th

Monday·January 19, 2026

4 papers—1 primary·3 cross-listed

All4Primary1Cross-lists3
  1. 01

    [Submitted on 16 Jan 2026]

    Fine-tunings in radiative -particle capture on C at astrophysical energies

    Ulf-G. Meißner · Bernard Ch. Metsch · Helen Meyer

    We investigate the fine-tuning of radiative alpha-particle capture on carbon, , at astrophysical energies. Utilizing results from cluster effective field theory for this reaction, we find that the low-energy data of the astrophysical S-factor allow for only very small variations in the electromagnetic fine-structure constant , namely per mille, in both the and the radiative capture.

    Comments:
    6+3 pages, 4+3 figures; version accepted for publication in Commun. Theor. Phys
    Subjects:
    Nuclear Theory (nucl-th); Solar and Stellar Astrophysics (astro-ph.SR); High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Theory (hep-th)
    arXiv:
    2601.11180 [pdf]
    Commun.Theor.Phys.(2026)·0 citations
  2. 02

    [Submitted on 16 Jan 2026] (cross-list from hep-ph)

    Elliptic flow of charm quarks produced in the early stage of pA collisions

    Gabriele Parisi🇮🇹 · Fabrizio Murgana🇫🇷 · Vincenzo Greco🇮🇹 · Marco Ruggieri🇮🇹

    We investigate the build-up of elliptic flow of charm quarks produced in the early pre-equilibrium stage of high-energy proton--nucleus collisions. The initial stage is modeled within the Color Glass Condensate framework as an evolving glasma, initialized through the McLerran--Venugopalan model. Subnucleonic fluctuations have been implemented as constituent-quark hotspots for both the proton and the nuclear participants. Charm quarks are propagated in the evolving non-Abelian background by solving the relativistic Wong equations for their coordinates, momenta, and color charges. First, we compute the nuclear modification factor of charm quarks, finding a slight migration towards higher states in agreement with previous results in the literature. Then, we focus on the azimuthal anisotropies acquired through the interaction with glasma fields. We find that glasma-induced momentum anisotropies are efficiently transmitted to heavy quarks within , leading to a sizeable charm-quark , with a magnitude that increases with the strength of the initial fields and with the number of nuclear participants. Remarkably, we show that the early-stage contribution alone can account for a significant fraction of the experimentally observed elliptic flow in p-Pb collisions, indicating that pre-hydrodynamic dynamics can play a non-negligible role in the final-state heavy-flavor collectivity, especially in small systems.

    Comments:
    12 pages, 9 figures. v2: added reference to Zenodo repository, minor revisions to match the version published in Phys. Rev. D
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    2601.11123 [pdf]
    PRD(2026)·1 citation
  3. 03

    [Submitted on 16 Jan 2026] (cross-list from quant-ph)

    From three-body resonances to bound states in a continuum: pole trajectories

    Lucas Happ

    We investigate the formation of three-body bound states in the continuum by tracing pole trajectories in the complex energy plane under variation of system parameters. Using a one-dimensional model of two identical bosons and a distinguishable particle interacting via Gaussian potentials, we systematically vary the interaction strength, interaction range, and mass ratio. Our results confirm the parametric nature of few-body bound states in a continuum (BIC) and extend this characterization to a broader set of system parameters. Specifically, we find that variations of both interaction parameters and the mass ratio can lead to the formation of at least one three-body BIC. However, the exact shape of trajectories differs, and for the mass ratio variation we find a more regular pattern with multiple BIC locations. These results suggest that the mechanism of few-body BIC formation is more sensitive to the kinematic structure of the problem than to the specific details of the two-body interaction.

    Subjects:
    Quantum Physics (quant-ph); Quantum Gases (cond-mat.quant-gas); Nuclear Theory (nucl-th)
    arXiv:
    2601.11188 [pdf]
    Few Body Syst.(2026)·2 citations
  4. 04

    [Submitted on 16 Jan 2026] (cross-list from nucl-ex)

    The unfinished picture of low-energy antineutron interactions: open issues and hints for future research possibilities

    A. Filippi (Istituto Nazionale di Fisica Nucleare, sezione di Torino, Italy)🇮🇹

    This report examines the open questions that remain unsolved following the measurements with antineutrons () as probes conducted up to the 1990s at the LEAR facility at CERN. It also presents suggestions for possible new experiments at a future, upgraded AD complex, which can potentially provide access to new areas of physics.

    Comments:
    10 pages, 18 figures
    Subjects:
    Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    2601.11390 [pdf]
    1 citation

Affiliations

first authorsco-authorsvia INSPIRE