Measurements of cross sections and charge asymmetries for e+e-→τ+τ-and e+e-→μ+μ-for s from 52 to 57 GeV

A. Bacala, R. L. Malchow, K. Sparks, R. Imlay, P. Kirk, R. R. McNeil, W. Metcalf, Winston Ko, R. L. Lander, K. Maeshima, J. R. Smith, M. C.S. Williams, C. P. Cheng, J. Li, Y. K. Li, Z. P. Mao, Y. Yan, Y. T. Xu, Y. C. Zhu, A. AbashianK. Gotow, F. Kajino, E. Low, F. Naito, L. Piilonen, R. Childers, C. Darden, S. Lusin, C. Rosenfeld, A. Wang, S. Wilson, M. Frautschi, H. Kagan, R. Kass, C. G. Trahern, K. Abe, S. Chakrabarti, Y. Fujii, Y. Higashi, Y. Kurihara, A. Maki, T. Nozaki, T. Omori, P. Perez, H. Sagawa, Y. Sakai, Y. Sugimoto, Y. Takaiwa, S. Terada, K. Tsuchiya, R. Poling, J. Green, I. H. Park, S. Sakamoto, F. Sannes, S. Schnetzer, R. Stone, S. Trentalange, D. Zimmerman, K. Miyano, H. Miyata, M. Ogawa, Y. Yamashita, D. Blanis, A. Bodek, H. Budd, R. Coombes, S. Eno, C. A. Fry, H. Harada, Y. H. Ho, Y. K. Kim, T. Kumita, T. Mori, S. L. Olsen, N. M. Shaw, A. Sill, E. H. Thorndike, K. Ueno, H. W. Zheng, H. Asakura, K. Eguchi, H. Itoh, S. Kobayashi, A. Murakami, K. Toyoshima, J. S. Kang, H. J. Kim, S. K. Kim, M. H. Lee, S. S. Myung, E. J. Kim, G. N. Kim, D. Son, H. Kozuka, S. Matsumoto, T. Sasaki, T. Takeda, R. Tanaka, R. Chiba, K. Hanaoka, S. Igarashi, H. Murata, H. Yokota, Y. Ishi, T. Ishizuka, K. Ohta

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Abstract

Measurements of the differential cross sections for e+e-→μ+μ- and e+e-→τ+τ- at values of s from 52 to 57 GeV are reported. The forward-backward asymmetries and the total cross sections for these reactions are found to be in agreement with predictions of the standard model of the electro-weak interactions. These measurements are used to extract values of the weak coupling constant gv egv l and gA egA l, where l = μ or τ.

Original languageEnglish (US)
Pages (from-to)112-118
Number of pages7
JournalPhysics Letters B
Volume218
Issue number1
DOIs
StatePublished - Feb 9 1989

Bibliographical note

Funding Information:
We thank the TRISTAN staff for the excellent operation of the storage ring. In addition we acknowl-"edge the strong support and enthusiastic assistance provided by the staffs of our home institutions. This work has been supported by the Japan Ministry of Education, Science and Culture (Monbusho), The US Department of Energy and National Science Foundation, the Korean Science and Engineering Foundation and Ministry of Education, and the Academia Sinica of the People's Republic of China.

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