Search for the rare decay $D^+ \to D^0 e^+\nu_e$

TL;DR

This study searches for a rare charm meson decay using BESIII data but finds no evidence, setting an upper limit on its branching fraction to constrain theoretical models.

Contribution

First search for the decay $D^+ o D^0 e^+ u_e$ with BESIII data, establishing an upper limit on its branching fraction.

Findings

No signal observed for the decay.

Upper limit on branching fraction set at $1.0 imes 10^{-4}$.

Provides constraints for theoretical models of rare charm decays.

Abstract

We search for the rare decay $D^+\to D^0 e^+\nu_{e}$, using a data set with an integrated luminosity of 2.93 $\rm fb^{-1}$ collected at $\sqrt{s}=3.773$ GeV with the BESIII detector operating at the BEPCII storage rings. No signals are observed. We set the upper limit on the branching fraction for $D^+\to D^0 e^+\nu_e$ to be $1.0\times 10^{-4}$ at the 90\% confidence level.