Speaker
Sifan Zhang
(Institute of High Energy Physics Chinese Academy of Sciences)
Description
Using 2.93 fb−1 data taken at s√=3.773 GeV and 3.19~fb−1 data taken at s√=4.178 GeV with the BESIII detector, precision measurements of the branching fractions of D0→K−μ+νμ, D+→K¯0μ+νμ, D0→π−μ+νμ, D+→π0μ+νμ and D+s→μ+νμ are performed.
Combining the known branching fractions of D→K¯e+νe, D→πe+νe and D+s→τ+ντ,
we have tested the lepton flavor universality with D→K¯ℓ+νℓ, D→πℓ+νℓ and D+s→ℓ+νℓ decays.
We have also tested lepton flavor universality in different q2ℓνℓ intervals for D→K¯ℓ+νℓ (ℓ=e or μ).
Besides, hadronic form factor fK+(0), D+s decay constant fD+s, and quark mixing matrix element |Vcs| are also extracted with the most precise accuracies to date.
