Search for the radiative decay $D^+_s \to \gamma K^*(892)^+$

TL;DR

This study searches for the rare radiative decay of the $D_s^+$ meson into a photon and a $K^*(892)^+$, using extensive collision data, but finds no significant signal and sets an upper limit on its branching fraction.

Contribution

First search for the $D_s^+ o\gamma K^*(892)^+$ decay mode using BESIII data, establishing an upper limit on its branching fraction.

Findings

No significant signal observed for the decay.

Upper limit on branching fraction set at $2.3 imes10^{-4}$.

Data analysis constrains future searches.

Abstract

Using 7.33 fb$^{-1}$ of $e^+e^-$ collision data samples collected with the BESIII detector at center-of-mass energies between 4.128 and 4.226 GeV, we perform a simultaneous fit to search for the radiative decay $D_s^+\to\gamma K^*(892)^+$ via $K^*(892)^+\to K^+\pi^0$ and $K^*(892)^+\to K_S^0\pi^+$ for the first time. No significant signals are observed. The upper limit on the branching fraction of $D^+_s\to\gamma K^*(892)^+$ is set to be $2.3\times10^{-4}$ at the $90\%$ confidence level.