Observation Of Exclusive Eta(C) Production In Two Photon Interactions At Tristan

M Shirai,H Miyata,T Sasaki, N Nakajima, A Kimura,K Miyano, M Sato,Y Yamashita, T Aso,A Bacala, K Abe, Y Fujii,Y Kurihara,Mh Lee,A Maki,T Nozaki, T Omori,H Sagawa, Y Sakai,Y Sugimoto, Y Takaiwa,N Takashimizu,S Terada, P Kirk,Tj Wang, A Abashian, K Gotow,L Piilonen,Sk Choi,C Rosenfeld,Ly Zheng,Re Breedon, W Ko,Rl Lander, J Rowe,Sl Olsen,Sk Sahu,S Schnetzer,S Kobayashi, A Murakami,Js Kang,Dy Kim,Ss Myung,Hs Ahn,Hj Kim,Sk Kim,K Ueno,S Matsumoto, S Behari

PHYSICS LETTERS B（1998）

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摘要

We observe eta(c) production in the two photon process e(+)e(-) --> e(+)e(-) eta(c) at an e(+)e(-) center-of-mass energy of 58 GeV. We determine the radiative decay width Gamma(gamma gamma)(eta(c)) to be 27 +/- 16(sta) +/- 10(sys) keV. (C) 1998 Published by Elsevier Science B.V.

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