Search for the rare decays $D\to h(h')e^+e^-$

TL;DR

This study searches for rare $D$ meson decays involving hadrons and electron-positron pairs using BESIII data, setting new upper limits that improve sensitivity over previous efforts.

Contribution

First search for $D o h(h') e^+ e^-$ decays with BESIII data, establishing the most stringent upper limits to date.

Findings

No significant signals observed.

Upper limits on branching fractions at 90% confidence level.

Sensitivity reaches the level of 10^{-5} to 10^{-6}.

Abstract

We search for rare decays of $D$ mesons to hadrons accompany with an electron-positron pair (h(h')$e^+e^-$), using an $e^+e^-$ collision sample corresponding to an integrated luminosity of 2.93 fb$^{-1}$ collected with the BESIII detector at $\sqrt{s}$ = 3.773 GeV. No significant signals are observed, and the corresponding upper limits on the branching fractions at the $90\%$ confidence level are determined. The sensitivities of the results are at the level of $10^{-5} \sim 10^{-6}$, providing a large improvement over previous searches.