Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8186250 | Physics Letters B | 2018 | 7 Pages |
Abstract
Weâhaveâsearchedâforâexclusiveâproductionâofâexoticâcharmoniaâinâtheâreaction μ+Nâμ+(J/ÏÏ+Ïâ)ϱNâ² using COMPASS data collected with incoming muons of 160 GeV/c and 200 GeV/c momentum. In the J/ÏÏ+Ïâ mass distribution we observe a signal with a statistical significance of 4.1 Ï. Its mass and width are consistent with those of the X(3872). The shape of the Ï+Ïâ mass distribution from the observed decay into J/ÏÏ+Ïâ 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=â1 predicted by a tetraquark model. The product of cross section and branching fraction of the decay of the observed state into J/ÏÏ+Ïâ is determined to be 71±28(stat)±39(syst) pb.
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