期刊
PHYSICS LETTERS B
卷 783, 期 -, 页码 334-340出版社
ELSEVIER
DOI: 10.1016/j.physletb.2018.07.008
关键词
COMPASS; X(3872); Photoproduction; Tetraquark; Exotic charmonia
资金
- DFG cluster of excellence 'Origin and Structure of the Universe' (Germany)
- Laboratoire d'excellence P2IO (France)
- DFG (Germany)
- BMBF - Bundesministerium fur Bildung and Forschung (Germany)
- European Union [283286]
- MEYS (Czech Republic) [LG13031]
- SAIL (CSR)
- B. Sen fund (India)
- CERN-RFBR Grant [12-02-91500]
- FCT - Fundacao para a Ciencia e Tecnologia (Portugal) [CERN/FP 116376/2010, 123600/2011, CERN/FIS-NUC/0017/2015]
- MEXT (Japan) [18002006, 20540299, 18540281, 26247032]
- JSPS (Japan) [18002006, 20540299, 18540281, 26247032]
- Yamada Foundation (Japan)
- Daiko Foundation (Japan)
- Ministry of Science and Technology (Taiwan)
- Israel Academy of Sciences and Humanities (Israel)
- Russian Federation program Nauka (Russia) [0.1764.GZB.2017]
- National Science Foundation (USA) [PHY-1506416]
- NCN (Poland) [2017/26/M/ST2/00498]
- Fundação para a Ciência e a Tecnologia [CERN/FIS-NUC/0017/2015, CERN/FP/116376/2010] Funding Source: FCT
- Grants-in-Aid for Scientific Research [26247032] Funding Source: KAKEN
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.
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