Journal article

Observation of a Charmoniumlike Enhancement in the gamma gamma ->omega J/psi Process

S Uehara, T Aushev, AM Bakich, K Belous, V Bhardwaj, M Bischofberger, M Bracko, TE Browder, P Chang, A Chen, P Chen, BG Cheon, C-C Chiang, I-S Cho, S-K Choi, Y Choi, J Dalseno, A Drutskoy, S Eidelman, D Epifanov Show all

Physical Review Letters | AMER PHYSICAL SOC | Published : 2010

Abstract

We report the results of a search for a charmoniumlike state produced in the process gammagamma-->omegaJ/psi in the 3.9-4.2 GeV/c{2} mass region. We observe a significant enhancement, which is well described by a resonant shape with mass M=(3915+/-3+/-2) MeV/c{2} and total width Gamma=(17+/-10+/-3) MeV. This enhancement may be related to one or more of the three charmoniumlike states so far reported in the 3.90-3.95 GeV/c{2} mass region.

Grants

Awarded by Grants-in-Aid for Scientific Research


Funding Acknowledgements

We thank the KEKB group for excellent operation of the accelerator, the KEK cryogenics group for efficient solenoid operations, and the KEK computer group and the NII for valuable computing and SINET3 network support. We acknowledge support from MEXT, JSPS and Nagoya's TLPRC (Japan); ARC and DIISR (Australia); NSFC (China); DST (India); MEST, KOSEF, KRF (Korea); MNiSW (Poland); MES and RFAAE (Russia); ARRS Slovenia); SNSF (Switzerland); NSC and MOE (Taiwan); and DOE (USA).