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Search for muoproduction of X(3872) at COMPASS and indication of a new state (X)over-tilde(3872)

Author
Aghasyan M. INFN, Trieste
Finger Miroslav, prof. Ing. DrSc. Faculty of Mathematics and Physics, Charles University in Prague
Finger Michael, M.Sc. CSc. Faculty of Mathematics and Physics, Charles University in Prague, JINR Dubna
Slunečka Miloš, Ing. Faculty of Mathematics and Physics, Charles University in Prague, JINR Dubna
Smolík Jan, Mgr. Ph.D. Faculty of Nuclear Sciences and Physical Engineering CTU
Taševský  Marek, Mgr. Ph.D. Institute of Physics ASCR
et al.  COMPASS collaboration

Year
2018

Scientific journal
Physics Letters B, 783, 334-340

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Abstract
We have searched for exclusive production of exotic charmonia in the reaction mu N+ -> mu(+)(J/psi pi(+)pi(-))pi N-+/-' using COMPASS data collected with incoming muons of 160 GeV/c and 200 GeV/c momentum. In the J/psi pi(vertical bar)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 +/- 28(stat)+/- 39(syst) pb. (C) 2018 The Author. Published by Elsevier B.V.

Cite article as:
M. Aghasyan, M. Finger, M. Finger, M. Slunečka, J. Smolík, M. Taševský , . et al., "Search for muoproduction of X(3872) at COMPASS and indication of a new state (X)over-tilde(3872)", Physics Letters B, 783, 334-340 (2018)