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)