Feasibility of the experimental study of $D_{s}^{\ast}$ ${\to}$ ${\phi}{\pi}$ decay

Abstract The current knowledge on the D∗ s meson are very limited. Besides the dominant electromagnetic decays, the D∗ s weak decays are legal and offer the valuable opportunities to explore the wanted D∗ s meson. In this paper, the D ∗ s → φπ decay was studied with the PQCD approach. It is found that the branching ratio B(D∗ s→φπ) ∼ O(10−7), which corresponds to several thousands of events at the e+e− collider experiments including STCF, SuperKEKB, CEPC and FCC-ee, and several millions of events at the hadron collider experiments, such as LHCb@HL-LHC. It is feasible to experimentally study the D∗ s → φπ weak decay in the future.