Measurements of R for e+e- annihilation at the KEK collider TRISTAN.

Tetsurou Kumita,H. Sagawa,Priscilla Auchincloss, D. Blanis,A. Bodek, H S Budd, S. Eno, C A Fry, Hiroyuki Harada, Y H Ho,Yong Bae Kim,Takeshi Mori,S L Olsen, N M Shaw,A. Sill, E H Thorndike,K. Ueno,H W Zheng,Kenji Abe,Yuichi Fujii,Yukihito Higashi,S K Kim,Yoshimasa Kurihara,Akihiro Maki,Tadashi Nozaki,Takashi Omori,Yuichi Sakai,Yukihiko Sugimoto, Y. Takaiwa,Susumu Terada, Richard L Walker, R. Imlay,P. Kirk, J N Lim,R R Mcneil,W. Metcalf,S S Myung, Caleb C P Cheng,P D Gu,J J Li,Y K Li,M H Ye,Y C Zhu, A. Abashian, K. Gotow,K P Hu,E H Low, M E Mattson,L E Piilonen, K L Sterner,S. Lusin, C. Rosenfeld, A T M Wang,Stephen Wilson,M. Frautschi, H. Kagan,R. Kass, C G Trahern, R. Breedon,G N Kim,Winston Ko, R. Lander, K. Maeshima, R. Malchow,J G Smith,D. Stuart,F. Kajino,D. Perticone,R. Poling, T D Thomas, Y. Ishi,Kazumasa Miyano,Hideaki Miyata,T. Sasaki,Yuichi Yamashita,A M Bacala,J M Liu,I H Park, F. Sannes, S. Schnetzer,R. Stone, J. Vinson,Shu Kobayashi,A. Murakami,J S Kang,H J Kim,M H Lee,Dong Hee Han,Eung Ju Kim,D. Son,Takuji Kojima,Seiji Matsumoto, R. Tanaka, Yoshio Yamagishi,T. Yasuda,T. Ishizuka,Kouji Ohta

PHYSICAL REVIEW D（1990）

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摘要

The ratio {ital R} of the total cross section for {ital e}{sup +}{ital e}{sup {minus}} annihilation into hadrons to the lowest-order QED cross section for {ital e}{sup +}{ital e}{sup {minus}}{r arrow}{mu}{sup +}{mu}{sup {minus}} has been measured for center-of-mass energies ranging from 50 to 61.4 GeV. If we allow for an overall shift of {minus}4.9%, about 1.5 times our estimated normalization error, the results are consistent with the standard-model predictions.

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关键词

cross section,standard model,center of mass

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