First Measurement of the $D_s^{+}\to K^{\ast }(892{)}^0\hat{I}{¼}^{+}\hat{I}{½}_{\hat{I}}¼$ Decay, Study of Dynamics and Test of Lepton Universality with $D_s^{+}\to K^{\ast }(892{)}^0{\ell }^{+}\hat{I}{½}_{\ell }$ Decays

BESIII Collaboration, M. Ablikim, M. N. Achasov +715

The BESIII experiment measured the semileptonic decays of the D_s^+ meson to a K*(892)^0 and a lepton-neutrino pair, determining branching fractions, hadronic form‑factor parameter…