Measurement of the Branching Fraction for the Decay $\ddot{I}{‡}_{cJ}\to p\bar{p}\hat{I}\cdot \ddot{I}{€}^0$

Abstract

Using $(2712.4\pm 14.3)\times 10^6\ddot{I}ˆ(3686)$ events collected by the BESIII detector operating at the BEPCII collider, we present the first observations of the decays $\ddot{I}{‡}_{cJ}(J=0,1,2)\to p\bar{p}\hat{I}\cdot \ddot{I}{€}^0$. Their decay branching fractions are determined to be $\mathcal{B}(\ddot{I}{‡}_{c0}\to p\bar{p}\hat{I}\cdot \ddot{I}{€}^0)=(2.41\pm 0.07\pm 0.19)\times 10^{-4}$, $\mathcal{B}(\ddot{I}{‡}_{c1}\to p\bar{p}\hat{I}\cdot \ddot{I}{€}^0)=(1.95\pm 0.05\pm 0.12)\times 10^{-4}$, and $\mathcal{B}(\ddot{I}{‡}_{c2}\to p\bar{p}\hat{I}\cdot \ddot{I}{€}^0)=(1.31\pm 0.05\pm 0.08)\times 10^{-4}$, where the first uncertainties are statistical and the second systematic.