SciPost Phys. Proc. 1, 016 (2019) ·
published 19 February 2019
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Using 2.93~fb−1 data taken at √s=3.773~GeV, 0.482~fb−1 data taken at √s=4.009~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+→ˉK0μ+νμ, D0→π−μ+νμ, D+→π0μ+νμ, D+→ℓ+νℓ and D+s→ℓ+νℓ are performed. Combining the known branching fractions of D→ˉKe+νe, D→πe+νe and D+s→τ+ντ, we have tested the lepton flavor universality with D→ˉKℓ+νℓ, D→πℓ+νℓ, D+→ℓ+νℓ and D+s→ℓ+νℓ decays. We have also tested lepton flavor universality in different q2ℓνℓ intervals for D→ˉKℓ+νℓ~(ℓ=e or μ). Besides, hadronic form factor fK+(0), D meson decay constant fD+s and fD+, and quark mixing matrix element |Vcs| and |Vcd| are also extracted with the most precise accuracies to date.