Speaker
Ke LIU
Description
By analyzing a 2.93~$\rm fb^{-1}$ data sample of $e^+e^-$ collisions,
recorded at a center-of-mass energy of 3.773 $\rm \,GeV$ with the BESIII detector operated at the BEPCII collider,
we report the first observation of the semileptonic $D^+$ transition into the axial-vector meson $D^{+} \rightarrow {\bar{K}}_{1}(1270)^{0}e^{+}\nu_{e}$
with a statistical significance greater than $10\sigma$.
Its decay branching fraction is determined to be
${\mathcal B}[D^+\to \bar K_1(1270)^0 e^+\nu_e]=(2.30\pm0.26^{+0.18}_{-0.21}
\pm 0.25)\times10^{-3}$, where the first and second uncertainties are
statistical and systematic, respectively, and the third originates from the input branching
fraction of ${\bar{K}}_{1}(1270)^{0} \rightarrow K^{-} \pi^{+} \pi^{0}$.
| Master Student, PhD Student or Postdoc | PhD Student |
|---|---|
| Presenter | Ke Liu |
| Publications | Phys. Rev. Lett. 123, 32801 (2019); Phys. Rev. D 97, 052005 (2018) |
Primary author
Ke Liu
(CCNU)
