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

T. Kumita, H. Sagawa, P. Auchincloss, D. Blanis, A. Bodek, H. Budd, S. Eno, C. A. Fry, H. Harada, Y. H. Ho, Y. K. Kim, T. Mori, S. L. Olsen, N. M. Shaw, A. Sill, E. H. Thorndike, K. Ueno, H. W. Zheng, K. Abe, Y. FujiiY. Higashi, S. K. Kim, Y. Kurihara, A. Maki, T. Nozaki, T. Omori, Y. Sakai, Y. Sugimoto, Y. Takaiwa, S. Terada, R. Walker, R. Imlay, P. Kirk, J. Lim, R. R. McNeil, W. Metcalf, S. S. Myung, C. P. Cheng, P. Gu, 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. Piilonen, K. L. Sterner, S. Lusin, C. Rosenfeld, A. T.M. Wang, S. Wilson, M. Frautschi, H. Kagan, R. Kass, C. G. Trahern, R. E. Breedon, G. N. Kim, Winston Ko, R. L. Lander, K. Maeshima, R. L. Malchow, J. R. Smith, D. Stuart, F. Kajino, D. Perticone, R. Poling, T. Thomas, Y. Ishi, K. Miyano, H. Miyata, T. Sasaki, Y. Yamashita, A. Bacala, J. Liu, I. H. Park, F. Sannes, S. Schnetzer, R. Stone, J. Vinson, S. Kobayashi, A. Murakami, J. S. Kang, H. J. Kim, M. H. Lee, D. H. Han, E. J. Kim, D. Son, T. Kojima, S. Matsumoto, R. Tanaka, Y. Yamagishi, T. Yasuda, T. Ishizuka, K. Ohta

Research output: Contribution to journalArticlepeer-review

31 Scopus citations

Abstract

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

Original languageEnglish (US)
Pages (from-to)1339-1349
Number of pages11
JournalPhysical Review D
Volume42
Issue number5
DOIs
StatePublished - 1990

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

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