Dalitz decay of $K^{\ast }(892)\to K{\ell }^{+}{\ell }^{-}$: A New Probe for Hadronic Structure and Dark Photon Searches

Benhou Xiang, Wanling Chang, Shuangshi Fang +1

We present the first comprehensive study of the rare Dalitz decay $K^{\ast }(892)\to K{\ell }^{+}{\ell }^{-}(\ell =e,\mu )$, providing a prediction for the branching fraction and the di…