Search for muoproduction of $X(3872)$ at COMPASS and indication of a new state $\tilde{X}(3872)$

M. Aghasyan, R. Akhunzyanov, M. G. Alexeev +224

We have searched for exclusive production of exotic charmonia in the reaction ${\mu }^{+}N\to {\mu }^{+}(J/\psi {\pi }^{+}{\pi }^{-}){\pi }^{\pm }{N}^{\prime }$ using COMPASS data collected with incoming muons of…