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Nuclear Theory·nucl-th

Tuesday·March 15, 2022

10 papers—3 primary·7 cross-listed

All10Primary3Cross-lists7
  1. 01

    [Submitted on 14 Mar 2022]

    Renormalization of One-Pion Exchange in Chiral Effective Field Theory for Antinucleon-Nucleon Scattering

    Daren Zhou🇨🇳 · Bingwei Long🇨🇳 · R. G. E. Timmermans🇳🇱 · U. van Kolck🇫🇷

    The renormalization of iterated one-pion exchange (OPE) is studied in Chiral Effective Field Theory (EFT) for the antinucleon-nucleon () system. The OPE potential is cut off at a certain distance and contact interactions are represented by a complex spherical well with the same radius. We investigate the dependence on the cutoff radius of the phase shifts, inelasticities, and mixing angles for the low partial waves in scattering. We show that renormalization requires additional contact interactions compared to the expectation based on naive dimensional analysis. Results after renormalization are compared with the state-of-the-art energy-dependent partial-wave analysis of data. We compare our conclusions with applications of EFT to the nucleon-nucleon system.

    Comments:
    33 pages, 22 figures and 3 tables
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph)
    arXiv:
    2203.06840 [pdf]
    PRC(2022)·5 citations
  2. 02

    [Submitted on 14 Mar 2022]

    Mapping topology of skyrmions and fractional quantum Hall droplets to nuclear EFT for ultra-dense baryonic matter

    Mannque Rho🇫🇷

    We describe the mapping at high density of topological structure of baryonic matter to a nuclear effective field theory that implements hidden symmetries emergent from strong nuclear correlations. The theory so constructed is found to be consistent with no conflicts with the presently available observations in both normal nuclear matter and compact-star matter. The hidden symmetries involved are "local flavor symmetry" of the vector mesons identified to be (Seiberg-)dual to the gluons of QCD and hidden "quantum scale symmetry" with an IR fixed point with a "genuine dilaton (GD)" characterized by non-vanishing pion and dilaton decay constants. Both the skyrmion topology for baryons and the fractional quantum Hall (FQH) droplet topology for baryons are unified in the "homogeneous/hidden" Wess-Zumino term in the hidden local symmetry (HLS) Lagrangian. The possible indispensable role of the FQH droplets in going beyond the density regime of compact stars approaching scale-chiral restoration is explored by moving toward the limit where both the dilaton and the pion go massless.

    Comments:
    A few typo corrections in published version. arXiv admin note: substantial text overlap with arXiv:2103.01860
    Subjects:
    Nuclear Theory (nucl-th); Solar and Stellar Astrophysics (astro-ph.SR); High Energy Physics — Phenomenology (hep-ph)
    arXiv:
    2203.06998 [pdf]
    Symmetry(2022)·4 citations
  3. 03

    [Submitted on 14 Mar 2022]

    Enhancement of incoherent bremsstrahlung in proton-nucleus scattering in the -resonance energy region

    Sergei P. Maydanyuk (1) ((1) Institute for Nuclear Research, National Academy of Sciences of Ukraine, Kyiv, 03680, Ukraine)

    We investigate emission of the bremsstrahlung photons in the scattering of protons off nuclei at the -resonance energy region. Including properties of -resonance in the nucleus-target to the bremsstrahlung model, we find the following. (1) Ratio between incoherent emission and coherent emission is about -- for (without -resonance) at energy of proton beam of 190~MeV, where the calculated full bremsstrahlung spectrum is in good agreement with experimental data. This confirms importance of incoherent processes in study of -resonances in this reaction, which have never been studied yet. We estimate coherent and incoherent contributions, electric and magnetic contributions, full bremsstrahlung spectra for the scattering of protons on the \isotope[12]{C}, \isotope[40]{Ca}, \isotope[208]{Pb} nuclei at ~MeV, we find conditions for the most intensive bremsstrahlung emission. (2) Transition in the nucleus-target reinforces emission of bremsstrahlung photons in that reaction at ~MeV. Difference between the spectra for normal nuclei and nuclei with included -resonance is larger for more light nuclei, but the spectra are larger for heavier nuclei. (3) Taking into account shortly lived state of -resonance, we find that the spectrum with -resonance in the nucleus-target is essentially larger in the high energy photon region than the spectrum without this -resonance (corresponding calculations for \isotope[12][\Delta]{C}, \isotope[40][\Delta]{Ca}, \isotope[208][\Delta]{Pb} in comparison with \isotope[12]{C}, \isotope[40]{Ca}, \isotope[208]{Pb} are provided). Such an aspect is recommended for registration of -resonances in nuclei in possible future experiments.

    Comments:
    24 pages, 9 captured figures, 2 appendixes
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex)
    arXiv:
    2203.07146 [pdf]
    PRC(2023)·7 citations

Affiliations

first authorsco-authorsvia INSPIRE