Strange quark mass effect in Bs →γγ, γ? ? ˉ decays

作者：Li D.-H.; Li L.-Y.; Lü C.-D.; Shen Y.-L.^*

来源：PHYSICAL REVIEW D, 2022, 106(9): 094038.

DOI：10.1103/PhysRevD.106.094038

In this paper we investigate the next-to-leading power contribution to the Bs→γγ and Bs→γ??ˉ decays from the strange quark mass effect with the dispersion approach which is QCD inspired and more predictive. We present the analytic expression of the quark mass contribution in the Bs→γγ and Bs→γ??ˉ decays, together with a new term that is missed in the previous study. We also evaluate the resolved photon contribution from the A-type amplitude in Bs→γ??ˉ decay. The numerical results of the strange quark mass contribution to the Bs→γγ decay is about 6% relative to the total branching ratio, while it is relatively small in the Bs→γ??ˉ decay due to the large resonance contribution.

• 单位
  中国科学院大学; 中国海洋大学