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Nuclear Theory·nucl-th

Friday·March 24, 2023

8 papers—5 primary·3 cross-listed

All8Primary5Cross-lists3
  1. 06

    [Submitted on 17 Mar 2023] (cross-list from hep-lat)

    Three relativistic neutrons in a finite volume

    Zachary T. Draper🇺🇸 · Maxwell T. Hansen🇬🇧 · Fernando Romero-López🇺🇸 · Stephen R. Sharpe🇺🇸

    We generalize the relativistic field-theoretic (RFT) three-particle finite-volume formalism to systems of three identical, massive, spin- fermions, such as three neutrons. This allows, in principle, for the determination of the three-neutron interaction from the finite-volume spectrum of three-neutron states, which can be obtained from lattice QCD calculations.

    Comments:
    47 pages including references, 1 figure
    Subjects:
    High Energy Physics — Lattice (hep-lat); High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    2303.10219 [pdf]
    JHEP(2023)·44 citations
  2. 07

    [Submitted on 21 Mar 2023] (cross-list from hep-ph)

    Shedding light on shadow generalized parton distributions

    Eric Moffat🇺🇸 · Adam Freese🇺🇸 · Ian Cloët🇺🇸 · Thomas Donohoe🇺🇸 · Leonard Gamberg🇺🇸 · Wally Melnitchouk🇺🇸 · Andreas Metz🇺🇸 · Alexei Prokudin🇺🇸 · Nobuo Sato🇺🇸

    The feasibility of extracting generalized parton distributions (GPDs) from deeply-virtual Compton scattering (DVCS) data has recently been questioned because of the existence of an infinite set of so-called ''shadow GPDs'' (SGPDs). These SGPDs depend on the process and manifest as multiple solutions (at a fixed scale ) to the inverse problem that needs to be solved to infer GPDs from DVCS data. SGPDs therefore pose a significant challenge for extracting GPDs from DVCS data. With this motivation we study the extent to which QCD evolution can provide constraints on SGPDs. This is possible because the known classes of SGPDs begin to contribute to observables after evolution, and can then be constrained (at the input scale ) by data that has a finite range. The impact that SGPDs could have on determining the total angular momentum, pressure and sheer force distributions, and tomography is also discussed. Our key finding is that scale evolution, coupled with data over a wide range of skewness and , can constrain the class of SGPDs that we studied and potentially make possible the extraction of GPDs from DVCS data over a limited range in the GPD variables.

    Comments:
    15 pages, 5 figures
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    2303.12006 [pdf]
    PRD(2023)·51 citations
  3. 08

    [Submitted on 23 Mar 2023] (cross-list from physics.atom-ph)

    Nuclear polarizability effects in He hyperfine splitting

    Vojtěch Patkóš · Vladimir A. Yerokhin · Krzysztof Pachucki

    The nuclear polarizability effects in hyperfine splitting of light atomic systems are not well known. The only system for which they were previously calculated is the hydrogen atom, where these effects were shown to contribute about 5\% of the total nuclear correction. One generally expects the polarizability effects to become more pronounced for composite nuclei. In the present work we determine the nuclear polarizability correction to the hyperfine splitting in He by comparing the effective Zemach radius deduced from the experimental hyperfine splitting with the Zemach radius obtained from the electron scattering. We obtain a surprising result that the nuclear polarizability of the helion yields just 3\% of the total nuclear correction, which is smaller than for the proton.

    Comments:
    5 pages, corrected misprint in Eq. (23)
    Subjects:
    Atomic Physics (physics.atom-ph); Nuclear Theory (nucl-th)
    arXiv:
    2303.13335 [pdf]
    PRA(2023)·9 citations

Affiliations

first authorsco-authorsvia INSPIRE