Radiative decay of the $\hat{I}{ž}_c(2923)$ in a hadronic molecule picture

Abstract

In the present work, we study the radiative decay of newly observed $\hat{I}{ž}_c(2923{)}^0$ based on the successful explanation that $\hat{I}{ž}_c(2923{)}^0$ is an $S$-wave $D\hat{I}›-D\hat{I}\pounds$ molecular state in our previous study~\cite{Zhu:2020jke}. The radiative decay width of $D\hat{I}›-D\hat{I}\pounds$ molecular state into $\hat{I}{ž}_c^0{\hat{I}}^3$ final state through hadronic loops are evaluated using effective Lagrangians. We find that decay width $\hat{I}{ž}_c(2923{)}^0\to \hat{I}{ž}_c^0{\hat{I}}^3$ and $\hat{I}{ž}_c(2923{)}^0\to \hat{I}{ž}_c^{{}^{\prime }0}{\hat{I}}^3$ is evaluated to be approximately 1.23-11.66 KeV and 0.30-3.71 KeV, respectively. These are different from the results~\cite{Wang:2020gkn,Bijker:2020tns} that obtained by assuming $\hat{I}{ž}_c(2923{)}^0$ may be conventional charmed baryon. If measurements are in future experimental, these differences will be very useful to help us to test various interpretations of $\hat{I}{ž}_c(2923{)}^0$.