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Title: Search for muoproduction of X(3872) at COMPASS and indication of a new state X˜(3872)
Authors: Aghasyan, Mher
Akhunzyanov, R. R.
Burtsev, Vitaly Evgenjevich
Chumakov, Aleksandr Grigorjevich
Dusaev, Renat Ramilyevich
Levchenko, Evgeny Anatolievich
Lyubovitskiy (Lyubovitskij), Valery Efimovich
Mamon, Sergey Aleksandrovich
Vasilishin, Bogdan Ivanovich
Keywords: X (3872); photoproduction; tetraquark; exotic charmonia; фотопродукция; тетракварки; чармоний
Issue Date: 2018
Publisher: Томский политехнический университет
Citation: Search for muoproduction of X(3872) at COMPASS and indication of a new state X˜(3872) / M. Aghasyan [et al.] // Physics Letters B. — 2018. — Vol. 783. — [P. 334-340].
Abstract: We 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 decay of the observed state into J/ψπ+π− is determined to be 71±28(stat)±39(syst) pb.
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