Observation of the doubly-charmed-baryon decay ${\hat{I}ž}_{cc}^{++}\to {\hat{I}ž}_c^0\ddot{I}{€}^{+}\ddot{I}{€}^{+}$

LHCb collaboration, R. Aaij, A. S. W. Abdelmotteleb +1134

A search for the doubly-charmed-baryon decay ${\hat{I}ž}_{cc}^{++}\to {\hat{I}ž}_c^0\ddot{I}{€}^{+}\ddot{I}{€}^{+}$ is performed using proton-proton collision data collected by the LHCb experiment at…