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
Web
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)