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    Study of baryon magnetic moments in covariant chiral effective theory
    Haifeng ZHOU, Jifeng YANG
    Journal of East China Normal University(Natural Science)    2024, 2024 (3): 12-26.   DOI: 10.3969/j.issn.1000-5641.2024.03.002
    Abstract （45）   HTML （6）    PDF （1586KB）（26）      

    In this paper, we calculate the next-to-leading order (NLO) corrections to the baryon mass and magnetic moment using the covariant chiral perturbation theory within the extended minimal subtraction$({\text{E}}\overline {{\text{MS}}})$scheme under SU(3). We also present a comparative analysis of the experimental data and lattice quantum chromodynamics data with the $ {\text{E}}\overline {{\text{MS}}} $ results, and extrapolate it into physical value. We show that $ {\text{E}}\overline {{\text{MS}}} $ provides a reasonable theoretical and numerical result at the NLO, better than those obtained from the heavy-baryon approach and infrared regularization, and close to that obtained by the extended-on-mass-shell (EOMS) scheme.

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    Research on the muon excess in ultrahigh-energy cosmic ray of extensive air-showers
    Zhiyi CUI, Jintao WU, Jianhong RUAN
    Journal of East China Normal University(Natural Science)    2024, 2024 (3): 27-35.   DOI: 10.3969/j.issn.1000-5641.2024.03.003
    Abstract （56）   HTML （4）    PDF （948KB）（14）      

    Recently, several air shower observatories established that the number of muons produced in ultrahigh-energy cosmic rays from extensive air-showers is significantly larger than that predicted by models. This study confirms that when ultrahigh-energy cosmic rays scatter on air particles, gluon condensation may occur. At this point, the production of strange quarks is significantly enhanced, such that more kaon will be generated in fragmentation products, and the air shower energy will be further distributed to the hadron cascade, which may explain the muon puzzle.

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