Speaker
Alex Gilman
Description
BESIII has collected data samples corresponding to luminosities of 2.93 fb-1 and 3.19 fb-1 at center-of-mass energies of 3.773 and 4.178, respectively. Based on these, we report measurements of the decays D(s)+ -> l+v (l=mu, tau), D0(+) -> K-bar(pi)l+v (l=e,mu), D0(+) -> K-bar(pi)pie+v, D0(+) -> a0(980)e+v, Ds+ -> eta(')e+v and Ds+ -> K(*)0e+v. From these analyses, precise determinations of the decay constants fD(s)+, the semileptonic form factors f^P_+(0) [P=K, pi, eta(')], the CKM matrix elements |Vcs(d)| are extracted. These results test LQCD calculations of fD(s)+ ,f^P_+(0) and the unitarity of the CKM matrix. Precision tests of lepton flavor universality are also made using D(s)+ -> l+v and D0(+) -> K-bar(pi)l+v, decays.
Author
Alex Gilman
