S-wave contributions to ■→(D0,■)π+π- in the perturbative QCD framework

作者：邢晔; 邢志鹏

来源：Chinese Physics C, 2019, 43(07): 26-34.

■→(D0,■)π+π-is induced by the b→c■s/b→u■s transitions,which can interfere if a CP-eigenstate DCP is formed.The interference contribution is sensitive to the CKM angle y.In this work,we study the S-wave π+π-contributions to the process in the perturbative QCD factorization.In the factorization framework,we adopt twomeson light-cone distribution amplitudes,whose normalization is parametrized by the S-wave time-like two-pion form factor with resonance contributions from f0(500),f0(980),f0(1500),f0(1790).We find that the branching ratio of ■→(D0,■)(π+π-)S is of the order of 10-6,and that significant interference exists in ■→DCP(π+π-)S.Future measurement could not only provide useful constraints on the CKM angle y,but would also be helpful for exploring the multi-body decay mechanism of heavy mesons.

• 单位
  上海交通大学