S-wave contributions to ■→(D^0,■)π^+π^- in the perturbative QCD framework  

作　　者：Ye Xing Zhi-Peng Xing 邢晔;邢志鹏(INPAC, SKLPPC, MOE Key Laboratory for Particle Physics, School of Physics and Astronomy,Shanghai Jiao Tong University)

机构地区：[1]INPAC, SKLPPC, MOE Key Laboratory for Particle Physics, School of Physics and Astronomy,Shanghai Jiao Tong University

出　　处：《Chinese Physics C》2019年第7期22-30,共9页中国物理C（英文版）

基　　金：Supported in part by National Natural Science Foundation of China(11575110,11735010);Natural Science Foundation of Shanghai(15DZ2272100);Key Laboratory for Particle Physics,Astrophysics and Cosmology,Ministry of Education

摘　　要：■→（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.Bs^-0→(D^0,D^-0)π^+π^-is induced by the b→cus/b→ucs 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 Bs^-0→(D^0,D^-0)(π^+π^-)S is of the order of 10^-6,and that significant interference exists in Bs^-0→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.

关 键 词：PQCD three bodys DECAYS γ ANGLE 

分 类 号：O572.33[理学—粒子物理与原子核物理]