Study of $D^{+} \to K^{-} π^+ e^+ ν_e$
M. Ablikim, M. N. Achasov, X. C. Ai, O. Albayrak et autres
We present an analysis of the decay $D^{+} \to K^{-} π^+ e^+ ν_e$ based on data collected by the BESIII experiment at the $ψ(3770)$ resonance. Using a nearly background-free sample of 18262 events, we measure the branching fraction $\mathcal{B}(D^{+} \to K^{-} π^+ …