We present a new analysis of double charmonium production in e +e- annihilation. The observation of the processes e + e- → J/ψηc, J/ ψχc0, and J/ψηc(2S) is confirmed using a data set more than 3 times larger than that of Belle's previous report, and no evidence for the process e+e- → J/ψJ/ψ is found. We perform an angular analysis for J/ψηc production and set an upper limit on the production of J/ψJ/ψ. Processes of the type e+e- → ψ(2S)(cc)res have been observed for the first time; their rates are found to be comparable to those of e+e- → J/ψ(cc)res processes.
|Journal||Physical Review D - Particles, Fields, Gravitation and Cosmology|
|Publication status||Published - 2004 Oct|
Bibliographical noteFunding Information:
We thank the KEKB group for the excellent operation ?>?>of the accelerator, the KEK Cryogenics group for the ?>?>efficient operation of the solenoid, and the KEK computer ?>?>group and the NII for valuable computing and Super-?>?>SINET network support. We acknowledge support from ?>?>MEXT and JSPS (Japan); ARC and DEST (Australia); ?>?>NSFC (Contract No. 10175071, China); DST (India); the ?>?>BK21 program of MOEHRD and the CHEP SRC program ?>?>of KOSEF (Korea); KBN (Contract No. 2P03B 01324, ?>?>Poland); MIST (Russia); MESS (Slovenia); NSC and ?>?>MOE (Taiwan); and DOE (USA).
All Science Journal Classification (ASJC) codes
- Nuclear and High Energy Physics