Search for the radiative decays $D^+\to\gamma\rho^+$ and $D^+\to\gamma K^{*+}$

TL;DR

This study searches for rare radiative decays of the $D^+$ meson into gamma and vector mesons, setting upper limits on their branching fractions due to no significant signals observed.

Contribution

First search for $D^+ o ho^+\, ext{and}\,K^{*+}$ radiative decays using BESIII data, establishing upper limits on their branching fractions.

Findings

No significant signals observed.

Upper limits on branching fractions set at $1.3\times10^{-5}$ and $1.8\times10^{-5}$.

Provides constraints for theoretical models of charm meson decays.

Abstract

We search for the radiative decays $D^{+} \to \gamma \rho^+$ and $D^{+} \to \gamma K^{*+}$ using 20.3~fb$^{-1}$ of $e^+e^-$ annihilation data collected at the center-of-mass energy $\sqrt{s}=3.773$ GeV by the BESIII detector operating at the BEPCII collider. No significant signals are observed, and the upper limits on the branching fractions of $D^{+} \to \gamma \rho^+$ and $D^{+} \to \gamma K^{*+}$ at 90\% confidence level are set to be $1.3\times10^{-5}$ and $1.8\times10^{-5}$, respectively.