Measurement of the proton-antiproton pair production from two-photon collisions at TRISTAN

H Hamasaki, K Abe, K Amako,Yoichi Arai,Y Asano,M Chiba,Yutaka Chiba,M Daigo,M Fukawa,Yoshimitsu Fukushima,J Haba,Hiroyuki Hanai, Y Hemmi,Masakazu Higuchi,Tatsuya Hirose,Yukio Homma,Nobuhiro Ishihara, Yuichi Iwata,J Kanzaki,Ryuji Kikuchi, T Kondo, Timo Tapani Korhonen,H Kurashige,E K Matsuda,T Matsui, Katsuhisa Miyake,S Mori,Yorikiyo Nagashima, Yoshihiro Nakagawa,Takahiro Nakamura, I Nakano,S Odaka,Kohei Ogawa,Taro Ohama,T Ohsugi, Hidenori Ohyama, K Okabe, A Okamoto,A Ono, J Pennanen,Hiroshi Sakamoto, M Sakuda, Masamichi Sato,Nobuaki Sato,M Shioden,Jeffry H Shirai,T Sumiyoshi,Yoshihiro Takada, F Takasaki,M Takita, N Tamura,Daisuke Tatsumi,K Tobimatsu,T Tsuboyama,S Uehara,Y Unno,Toshio Watanabe, Y Watase,F Yabuki, Yohko Yamada,T Yamagata,Yasuchika Yonezawa,H Yoshida,K Yusa

PHYSICS LETTERS B（1997）

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摘要

The cross section of the gamma gamma --> p (p) over bar reaction was measured at two-photon center-of-mass energy (W-gamma gamma) between 2.2 and 3.3 GeV, using the two-photon process at an e(+)e(-) collider, TRISTAN. The W-gamma gamma dependence of the cross section integrated over a c.m. angular region of \cos theta*\ < 0.6 is in good agreement with the previous measurements and the theoretical prediction based on diquark model in the high W-gamma gamma region. (C) 1997 Published by Elsevier Science B.V.

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关键词

particle physics,center of mass,cross section

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