July 31, 2017 to August 4, 2017
Fermi National Accelerator Laboratory
US/Central timezone

Pure and semi-leptonic decays of D(s) at BESIII

Aug 3, 2017, 10:45 AM
Curia II (Fermi National Accelerator Laboratory)

Curia II

Fermi National Accelerator Laboratory

Presentation Quark and Lepton Flavor Quark and Lepton Flavor


Ms Huijing Li (IHEP)


The world's largest e+e- collision samples at Ecm = 3.773, 4.009, 4.178, and 4.6 GeV have been accumulated at BESIII. By analyzing the decays of D(s)+ -> l+v (l=mu, tau) and D(s) -> (P/V) l+ v (l=e, mu), we report the determinations of CKM matrix elements |Vcs(d)|, the D(s)+ decay constants fD(s)+, the form factors f^K/pi_+(0) of D semi-leptonic decays. These are important to calibrate the LQCD calculations of fD(s)+ and f^K/pi_+(0) and to test the CKM unitarity, and determine the eta-eta' mixing angle. In the partial wave analysis of the decay D+ -> K- pi- e + v, we find that the dominant bar{K}*(892)0 component is accompanied by an S-wave contribution. This analysis also allows us to extract the helicity basis form factor of the resonance in a model-independent way. Also, for the first time, we search for D+ -> gamma e+ v and D+ -> D0 e+ v as well as for D -> a0(980) e+ v.

Primary author

Ms Huijing Li (IHEP)

Presentation materials