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Nuclear Theory·nucl-th

Friday·May 10, 2024

6 papers—2 primary·4 cross-listed

All6Primary2Cross-lists4
  1. 03

    [Submitted on 8 May 2024] (cross-list from hep-ph)

    Quasielastic Lepton-Nucleus Scattering and the Correlated Fermi Gas Model

    Bhubanjyoti Bhattacharya🇺🇸 · Sam Carey🇺🇸 · Erez O. Cohen🇮🇱 · Gil Paz🇺🇸

    The neutrino research program in the coming decades will require improved precision. A major source of uncertainty is the interaction of neutrinos with nuclei that serve as targets for such experiments. Broadly speaking, this interaction often depends, e.g., for charge-current quasi-elastic scattering, on the combination of ``nucleon physics", expressed by form factors, and ``nuclear physics", expressed by a nuclear model. It is important to get a good handle on both. We present a fully analytic implementation of the Correlated Fermi Gas Model for electron-nucleus and charge-current quasi-elastic neutrino-nucleus scattering. The implementation is used to compare separately form factors and nuclear model effects for both electron-carbon and neutrino-carbon scattering data.

    Comments:
    32 pages, 17 figures
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    2405.05342 [pdf]
    PRD(2025)·2 citations
  2. 04

    [Submitted on 8 May 2024] (cross-list from astro-ph.HE)

    Exotic Stable Branches with Efficient TOV Sequences

    Reed Essick

    Modern inference schemes for the neutron star equation of state (EoS) require large numbers of stellar models constructed with different EoS, and these stellar models must capture all the behavior of stable stars. I introduce termination conditions for sequences of stellar models for cold, non-rotating neutron stars that can identify all stable stellar configurations up to arbitrarily large central pressures along with an efficient algorithm to build accurate interpolators for macroscopic properties. I explore the behavior of stars with both high- and low-central pressures. Interestingly, I find that EoS with monotonically increasing sound-speed can produce multiple stable branches (twin stars) and that large phase transitions at high densities can produce stable branches at nearly any mass scale, including sub-solar masses, while still supporting stars with . I conclude with some speculation about the astrophysical implications of this behavior.

    Comments:
    7 pages, 4 figures before appendix (11 pages, 5 figures total)
    Subjects:
    High Energy Astrophysical Phenomena (astro-ph.HE); General Relativity and Quantum Cosmology (gr-qc); Nuclear Theory (nucl-th)
    arXiv:
    2405.05395 [pdf]
    ApJL(2024)·7 citations
  3. 05

    [Submitted on 9 May 2024] (cross-list from hep-th)

    Robustness of the Hedgehog Skyrmion

    N.S.Manton🇬🇧

    We investigate the radial profile function of the hedgehog Skyrmion with unit baryon number in generic EFTs (effective field theories) of pions. The analysis assumes chiral symmetry and ignores the pion mass term. The Skyrmion is always smooth, because it has no point source at the origin, and terms in the EFT with higher numbers of pion derivatives do not result in uncontrolled large corrections or singularities there. The profile varies in quite a limited way as the terms in the EFT change, and a universal profile function is proposed.

    Comments:
    15 pages
    Subjects:
    High Energy Physics — Theory (hep-th); Nuclear Theory (nucl-th)
    arXiv:
    2405.05731 [pdf]
    JHEP(2024)·2 citations
  4. 06

    [Submitted on 9 May 2024] (cross-list from hep-ex)

    In-medium changes of nucleon cross sections tested in neutrino-induced reactions

    B. Bogart🇺🇸 · K. Gallmeister🇩🇪 · U. Mosel🇩🇪

    Historically studied in the context of heavy-ion collisions, the extent to which free nucleon-nucleon cross sections are modified in-medium remains undetermined by these data sets. Therefore, we investigate the impact of NN in-medium modifications on neutrino-nucleus cross section predictions using the GiBUU transport model. We find that including an in-medium lowering of the NN cross section and density dependence on excitation improves agreement with MicroBooNE neutrino-argon scattering data. This is observed for both proton and neutral pion spectra in charged-current muon neutrino and neutral-current single pion production datasets. The impact of collision broadening of the resonance is also investigated. The absence of broadening is slightly favored, but the larger uncertainties on the pion production data prevent definitive conclusions.

    Subjects:
    High Energy Physics — Experiment (hep-ex); High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    2405.05921 [pdf]
    PRC(2024)·10 citations

Affiliations

first authorsco-authorsvia INSPIRE