Search for muoproduction of $X (3872)$ at COMPASS and indication of a new state $\widetilde{X}(3872)$
- Aghasyan, M.
- Akhunzyanov, R.
- Alexeev, M.G.
- Alexeev, G.D.
- Amoroso, A.
- Andrieux, V.
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- Antoshkin, A.
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- Bedfer, Y.
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- Burtsev, V.E.
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- Dreisbach, Ch.
- Dünnweber, W.
- Dusaev, R.R.
- Dziewiecki, M.
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- Eversheim, P.D.
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- Fischer, H.
- Franco, C.
- du Fresne von Hohenesche, N.
- Friedrich, J.M.
- Frolov, V.
- Fuchey, E.
- Gautheron, F.
- Gavrichtchouk, O.P.
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- Giordano, F.
- Gnesi, I.
- Gorzellik, M.
- Grasso, A.
- Gridin, A.
- Grosse Perdekamp, M.
- Grube, B.
- Grussenmeyer, T.
- Guskov, A.
- Hahne, D.
- Hamar, G.
- Von Harrach, D.
- Heinsius, F.H.
- HEITZ, R.
- Herrmann, F.
- Horikawa, N.
- D'Hose, N.
- Hsieh, C.-Y.
- Huber, S.
- Ishimoto, S.
- Ivanov, A.
- Ivanshin, Yu.
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- Khaustov, G.V.
- Khokhlov, Yu.A.
- Kisselev, Yu.
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- Koivuniemi, J.H.
- Kolosov, V.N.
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- Konstantinov, V.F.
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- Uhl, S.
- Vasilishin, B.I.
- Vauth, A.
- Veloso, J.
- Vidon, A.
- Virius, M.
- Wallner, S.
- Weisrock, T.
- Wilfert, M.
- ter Wolbeek, J.
- Zaremba, K.
- Zavada, P.
- Zavertyaev, M.
- Zemlyanichkina, E.
- Zhuravlev, N.
- Ziembicki, M.
DOIAbstract
International audienceWe have searched for exclusive production of exotic charmonia in the reaction μ+N→μ+(J/ψπ+π−)π±N′ using COMPASS data collected with incoming muons of 160 GeV/ c and 200 GeV/ c momentum. In the J/ψπ+π− mass distribution we observe a signal with a statistical significance of 4.1 σ . Its mass and width are consistent with those of the X(3872) . The shape of the π+π− mass distribution from the observed decay into J/ψπ+π− 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...
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