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

Abstract

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 160 GeV/$c$ and 200 GeV/$c$ momentum. In the $J/\psi {\pi }^{+}{\pi }^{-}$ mass distribution we observe a signal with a statistical significance of 4.1 $\sigma$. Its mass and width are consistent with those of the $X(3872)$. The shape of the ${\pi }^{+}{\pi }^{-}$ mass distribution from the observed decay into $J/\psi {\pi }^{+}{\pi }^{-}$ shows disagreement with previous observations for $X(3872)$. The observed signal may be interpreted as a possible evidence of a new charmonium state. It could be associated with a neutral partner of $X(3872)$ with $C=-1$ predicted by a tetraquark model. The product of cross section and branching fraction of the decay of the observed state into $J/\psi {\pi }^{+}{\pi }^{-}$ is determined to be 71$\pm$28(stat)$\pm$39(syst) pb.

arXiv comment12 pages, 6 figures

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• Role of the short-range dynamics in the formation of $D^{(\ast )}{\bar{D}}^{(\ast )}/B^{(\ast )}{\bar{B}}^{(\ast )}$ hadronic molecules
• Probing the structure of $X(3872)$ in photoproduction
• Statistical biases in measurements with multiple candidates
• Photoproduction of the $X(3872)$ beyond vector meson dominance: the open-charm coupled-channel mechanism
• Cross section measurement of $e^{+}{e}^{-}\to \eta \psi (2S)$ and search for $e^{+}{e}^{-}\to \eta \tilde{X}(3872)$
• Search for muoproduction of the X(3872) at COMPASS
• Muoproduction of exotic charmonia at COMPASS