Measurement of the Electromagnetic Coupling at Large Momentum Transfer

TOPAZ Collaboration; I. Levine; D. Koltick; B. Howell; E. Shibata; J. Fujimoto; T. Tauchi; K. Abe; T. Abe; I. Adachi; K. Adachi; M. Aoki; M. Aoki; K. Emi; R. Enomoto; H. Fujii; K. Fujii; T. Fujii; N. Fujiwara; H. Hayashii; H. Hirano; H. Ikeda; H. Ikeda; Y. Inoue; S. Itami; R. Itoh; H. Iwasaki; M. Iwasaki; R. Kajikawa; K. Kaneyuki; S. Kato; S. Kawabata; H. Kichimi; M. Kobayashi; H. Mamada; K. Miyabayashi; A. Miyamoto; K. Nagai; K. Nakabayashi; M. Nakamura; E. Nakano; O. Nitoh; S. Noguchi; A. Ochi; F. Ochiai; N. Ohishi; Y. Ohnishi; Y. Ohshima; H. Okuno; T. Okusawa; A. Sugiyama; S. Suzuki; K. Takahashi; T. Takahashi; T. Tanimori; Y. Teramoto; M. Tomoto; T. Tsukamoto; T. Tsumura; S. Uno; K. Watanabe; Y. Watanabe; A. Yamamoto; M. Yamauchi

doi:10.1103/PhysRevLett.78.424

Measurement of the Electromagnetic Coupling at Large Momentum Transfer

I. Levine¹, D. Koltick¹, B. Howell¹, E. Shibata¹, J. Fujimoto², T. Tauchi², K. Abe³, T. Abe³, I. Adachi² et al. (TOPAZ Collaboration)

I. Adachi², K. Adachi⁴, M. Aoki³, M. Aoki⁵, K. Emi⁶, R. Enomoto², H. Fujii², K. Fujii², T. Fujii^7,10, N. Fujiwara⁴, H. Hayashii⁴, H. Hirano⁶, H. Ikeda², H. Ikeda⁴, Y. Inoue⁸, S. Itami³, R. Itoh², H. Iwasaki², M. Iwasaki⁴, R. Kajikawa³, K. Kaneyuki⁵, S. Kato⁹, S. Kawabata², H. Kichimi², M. Kobayashi², H. Mamada⁶, K. Miyabayashi⁴, A. Miyamoto², K. Nagai¹⁰, K. Nakabayashi³, M. Nakamura⁸, E. Nakano⁸, O. Nitoh⁶, S. Noguchi⁴, A. Ochi⁵, F. Ochiai¹¹, N. Ohishi³, Y. Ohnishi³, Y. Ohshima⁵, H. Okuno⁹, T. Okusawa⁸, A. Sugiyama³, S. Suzuki³, K. Takahashi⁶, T. Takahashi⁸, T. Tanimori⁵, Y. Teramoto⁸, M. Tomoto³, T. Tsukamoto², T. Tsumura⁶, S. Uno², K. Watanabe⁵, Y. Watanabe⁵, A. Yamamoto², and M. Yamauchi² (TOPAZ Collaboration)

¹Department of Physics, Purdue University, West Lafayette, IN 47907
²National Laboratory for High Energy Physics, KEK, Ibaraki-ken 305, Japan
³Department of Physics, Nagoya University, Nagoya 464, Japan
⁴Department of Physics, Nara Women's University, Nara 630, Japan
⁵Department of Physics, Tokyo Institute of Technology, Tokyo 152, Japan
⁶Department of Applied Physics, Tokyo University of Agriculture and Technology, Tokyo 184, Japan
⁷Department of Physics, University of Tokyo, Tokyo 113, Japan
⁸Department of Physics, Osaka City University, Osaka 558, Japan
⁹Institute for Nuclear Study, University of Tokyo, Tokyo 188, Japan
¹⁰The Graduate School of Science and Technology, Kobe University, Kobe 657, Japan
¹¹Faculty of Liberal Arts, Tezukayama Gakuin University, Nara 631, Japan

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Phys. Rev. Lett. 78, 424 – Published 20 January, 1997

DOI: https://doi.org/10.1103/PhysRevLett.78.424

Abstract

We report the first purely electroweak measurement of the strengthening of the electromagnetic coupling, $α_{QED}$ with increasing momentum transfer $Q^{2}$ , by comparing the process $e^{+} e^{-} \to μ^{+} μ^{-}$ with the process $e^{+} e^{-} \to e^{+} e^{-} μ^{+} μ^{-}$ . The data were accumulated at an average center-of-mass energy $〈 \sqrt{s} 〉 = 57.77 GeV$ using the TOPAZ detector at the TRISTAN $e^{+} e^{-}$ collider. We measure $α_{QED}^{- 1} (Q^{2}$ ) to change from its known value of $α_{QED}^{- 1} ≅ 137.0$ at $Q^{2} = 0 to 128.5 \pm 1.8 (stat) \pm 0.7 (syst)$ at $Q^{2} = (57.77 GeV / c)^{2}$ . This result agrees with electroweak predictions.

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Measurement of the Electromagnetic Coupling at Large Momentum Transfer

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