Phys. Rev. D
57,
5345–5362
(1998)
Precise measurement of the e+e-→μ+μ- reaction at √s=57.77 GeV
M. Miura et al. (VENUS Collaboration)
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M. Miura3,*, S. Odaka2,†, T. Arima3,‡, K. Tobimatsu20, K. Ogawa2,§, J. Shirai2,**, T. Tsuboyama2, K. Abe1, K. Amako2, Y. Arai2, Y. Asano3, M. Chiba4, Y. Chiba5, M. Daigo6, M. Fukawa2,††, Y. Fukushima2, J. Haba2, H. Hamasaki3, Y. Hemmi7, M. Higuchi8, T. Hirose4, Y. Homma9, N. Ishihara2, Y. Iwata10, J. Kanzaki2, R. Kikuchi7, T. Kondo2, T. T. Korhonen2,11,‡‡, H. Kurashige7, E. K. Matsuda12, T. Matsui2, K. Miyake7, S. Mori3, Y. Nagashima13, Y. Nakagawa14,a, T. Nakamura12,b, I. Nakano15, T. Ohama2, T. Ohsugi10, H. Ohyama16, K. Okabe15, A. Okamoto7, A. Ono17, J. Pennanen2,11, H. Sakamoto7, M. Sakuda2, M. Sato8, N. Sato2, M. Shioden18, T. Sumiyoshi2, Y. Takada3, F. Takasaki2, M. Takita13, N. Tamura19, D. Tatsumi13,c, S. Uehara2, Y. Unno2, T. Watanabe21, Y. Watase2, F. Yabuki4, Y. Yamada2, T. Yamagata14, Y. Yonezawa22, H. Yoshida23, and K. Yusa3,d (VENUS Collaboration)
1Department of Physics, Tohoku University, Sendai 980, Japan
2High Energy Accelerator Research Organization (KEK), Tsukuba 305, Japan
3Institute of Applied Physics, University of Tsukuba, Tsukuba 305, Japan
4Department of Physics, Tokyo Metropolitan University, Hachioji 192-03, Japan
5Yasuda Women’s Junior College, Hiroshima 731-01, Japan
6Faculty of Economics, Toyama University, Toyama 930, Japan
7Department of Physics, Kyoto University, Kyoto 606, Japan
8Department of Applied Physics, Tohoku-Gakuin University, Tagajo 985, Japan
9Faculty of Engineering, Kobe University, Kobe 657, Japan
10Department of Physics, Hiroshima University, Higashi-Hiroshima 724, Japan
11Research Institute for High Energy Physics, Helsinki University, SF-00170 Helsinki, Finland
12Faculty of Engineering, Miyazaki University, Miyazaki 889-01, Japan
13Department of Physics, Osaka University, Toyonaka 560, Japan
14International Christian University, Mitaka 181, Japan
15Department of Physics, Okayama University, Okayama 700, Japan
16Hiroshima National College of Maritime Technology, Higashino 725-02, Japan
17Faculty of Cross-Cultural Studies, Kobe University, Kobe 657, Japan
18Ibaraki College of Technology, Katsuta 312, Japan
19Department of Physics, Niigata University, Niigata 950-21, Japan
20Center for Information Science, Kogakuin University, Tokyo 163-91, Japan
21Department of Physics, Kogakuin University, Hachioji 192, Japan
22Tsukuba College of Technology, Tsukuba 305, Japan
23Naruto University of Education, Naruto 772, Japan
Received 28 October 1997; published in the issue dated 1 May 1998
The reaction e+e-→μ+μ- has been measured at √s=57.77 GeV, based on 289.6±2.6 pb-1 data collected with the VENUS detector at TRISTAN. The production cross section is measured in bins of the production angle within an angular acceptance of |cosθ|<~0.75, according to a model-independent definition. The result is consistent with the prediction of the standard electroweak theory. Although a trend in measurements at lower energies that the total cross section tends to be smaller than the prediction remains, the discrepancy is not significant. The model-independent result is converted to the differential cross section in the effective-Born scheme by unfolding photon-radiation effects. This result can be extrapolated to quantities for the full solid angle as σtotEB=30.05±0.59 pb and AFBEB=-0.350±0.017, by imposing an ordinary assumption on the production-angle dependence. The converted results are used to set constraints on extensions of the standard theory. S-matrix parametrization, and possible contributions from contact interactions and heavy neutral-scalar exchanges are examined.
© 1998 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevD.57.5345
DOI:
10.1103/PhysRevD.57.5345
PACS:
13.10.+q, 12.60.-i, 14.60.Ef
*Present address: Institute for Cosmic Ray Research, University of Tokyo, Tanashi 188, Japan. †Author to whom correspondence should be addressed. Electronic address: shigeru.odaka@kek.jp ‡Present address: Faculty of Engineering, Kyushu University, Fukuoka 812, Japan. §Deceased. **Present address: Department of Physics, Tohoku University, Sendai 980, Japan. ††Present address: Naruto University of Education, Naruto 772, Japan. ‡‡Present address: Accelerator Laboratory, KEK, Tsukuba 305, Japan. aPresent address: Faculty of Science, Ehime University, Matsuyama 790, Japan. bDeceased. cPresent address: Institute for Cosmic Ray Research, University of Tokyo, Tanashi 188, Japan. dPresent address: Department of Physics, The Cancer Institute, Kami-Ikebukuro 170, Japan.
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