Evidence for the decay $X(3872)\to \psi (2S)\gamma$

LHCb collaboration, R. Aaij, B. Adeva +692

Evidence for the decay mode $X(3872)\to \psi (2S)\gamma$ in $B^{+}\to X(3872)K^{+}$ decays is found with a significance of 4.4 standard deviations. The analysis is based on a dat…