In this work, we study the radiative open-charm decays $Y(4140)\to { D}_s^{ \ast+} D_s^- \gamma$ and $Y(3930)\to{ D}^{ \ast+} D^-\gamma$ under the assignments of $D_{ s}^*\bar{ D}_s^*$ and $D^*\bar{ D}^*$ as molecular states for Y(4140) and Y(3930) respectively. Based on our numerical result, we propose the experimental measurement of the photon spectrum of $Y(4140)\to { D}_s^{ \ast+} D_s^- \gamma, D_{ s}^+D_{ s}^{ *-}\gamma$ and $Y(3930)\to D^{ *0}\bar{ D}^0\gamma, D^{ 0}\bar{ D}^{ *0}\gamma, D^{ *+}D^-\gamma, D^+D^{ *-}\gamma$ can further test the molecular assignment for Y(4140) and Y(3930).
Categories: hep-ph hep-ex nucl-th