2022/07/05 by Zhang, Zhi-Qing, Zhao, Yan-Chao, Guan, Zhi-Lin +3
#FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph)
paper · doi:10.48550/arxiv.2207.02043
In this work we study the quasi-two-body decays B→ K^*γ→ Kπγ in the perturbative QCD (PQCD) approach. The two-meson distribution amplitudes (DAs) are introduced to describe the final state interactions of the Kπ pair, which involve the time-like form factors and the Gegenbauer polynomials. We calculate the CP averaged branching ratios for the decays B(s)→ K^*γ→ Kπγ. Our results are in agreement with the new update data measured by Belle II, which suggests these quasi-two-body decays are more appropriate to be analyzed in three-body framework than in the two-body one. We also predict the direct CP-violation asymmetries for the considered decay modes and find that ACP(Bu,d→ K^*γ→ Kπγ) is small and less than 1% in magnitude, while ACP(Bs→ K^*γ→ Kπγ) is larger and can arrive at a few percent. Our predictions can be tested by the future B meson experiments.