• Corpus ID: 249953538

Weak radiative hyperon decays in covariant baryon chiral perturbation theory

  title={Weak radiative hyperon decays in covariant baryon chiral perturbation theory},
  author={Rui-Xiang Shi and Shuang-Yi Li and Jun-Xu Lu and Li-Sheng Geng},
Weak radiative hyperon decays, important to test the strong interaction and relevant in searches for beyond the standard model physics, have remained puzzling both experimentally and theoretically for a long time. The recently updated branching fraction and first measurement of the asymmetry parameter of Λ → n γ by the BESIII Collaboration further exacerbate the issue, as none of the existing predictions can describe the data. We show in this letter that the covariant baryon chiral perturbation… 



which can be easily shown to be redundant using the Cayley-Hamilton identity and noting thatB, B, Q, and λ are all traceless, and

  • A few remarks are in order. First, a sixth counterterm appears in Ref

CPS is CP followed by the SU(3) transformation of u → −u, d → s, s → d which exchanges s and d quarks

    In our work, the central value of each axial vector coupling is the average of the two central values determined by fitting to the SHD data and SHD + lattice QCD data in Ref

      National Natural Science Foundation of China under Grant No.12105006 and China Postdoctoral Science Foundation under Grant No. 2021M690008. * Corresponding author: lisheng