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
18m
Curia II (Fermi National Accelerator Laboratory)

Curia II

Fermi National Accelerator Laboratory

Presentation Quark and Lepton Flavor Quark and Lepton Flavor

Speaker

Ms Huijing Li (IHEP)

Description

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