Evidence for an resonance in decays

A Dalitz plot analysis of $$ decays is performed using data samples of pp collisions collected with the $$ detector at centre-of-mass energies of $$ and $$ , corresponding to a total integrated luminosity of $$ . A satisfactory description of the data is obtained when including a contribution representing an exotic $$ resonant state. The significance of this exotic resonance is more than three standard deviations, while its mass and width are $$ and $$ , respectively. The spin-parity assignments $$ and $$ are both consistent with the data. In addition, the first measurement of the $$ branching fraction is performed and gives where the first uncertainty is statistical, the second systematic, and the third is due to limited knowledge of external branching fractions.