Observation of D^0\to b_1(1235)^- e^+ν_e and evidence for D^+\to b_1(1235)^0 e^+ν_e

By analyzing a data sample of e^+e^- collisions with center-of-mass energy \sqrt{s}=3.773 GeV, corresponding to an integrated luminosity of 7.9~\rm {fb}^{-1} collected with the BESIII detector operating at the BEPCII collider, we study semileptonic decays of the D^{0(+)} mesons into the axial-vector meson b_1(1235) via the decay b_1(1235)\to \omega\pi. The... Show more