Search for muoproduction of X(3872) at COMPASS and indication of a new state X˜(3872)

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We have searched for exclusive production of exotic charmonia in the reaction μ+N→μ+(J/ψπ+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.

Original languageEnglish
Pages (from-to)334-340
Number of pages7
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Publication statusPublished - 10 Aug 2018


  • Exotic charmonia
  • Photoproduction
  • Tetraquark
  • X(3872)

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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