Precision Measurement of Electroweak Effects in <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msup><mrow><mi>e</mi></mrow><mrow><mo>+</mo></mrow></msup></mrow><mrow><msup><mrow><mi>e</mi></mrow><mrow><mo>−</mo></mrow></msup></mrow><mo>→</mo><mrow><msup><mrow><mi>μ</mi></mrow><mrow><mo>+</mo></mrow></msup></mrow><mrow><msup><mrow><mi>μ</mi></mrow><mrow><mo>−</mo></mrow></msup></mrow></math></span> at <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msqrt><mrow><mi>s</mi></mrow></msqrt></mrow><mrow><mrow><mrow></mrow></mrow></mrow><mo>=</mo><mn>29</mn><mn></mn></math></span> GeV

W. W. Ash; H. R. Band; H. T. Blume; T. Camporesi; G. B. Chadwick; S. H. Clearwater; R. W. Coombes; M. C. Delfino; E. Fernandez; W. T. Ford; M. W. Gettner; G. P. Goderre; D. E. Groom; B. K. Heltsley; R. B. Hurst; J. R. Johnson; K. H. Lau; T. L. Lavine; R. E. Leedy; I. Lippi; T. Maruyama; R. L. Messner; J. H. Moromisato; L. J. Moss; F. Muller; H. N. Nelson; I. Peruzzi; M. Piccolo; R. Prepost; N. Qi; A. L. Read, Jr; D. M. Ritson; L. J. Rosenberg; W. D. Shambroom; J. C. Sleeman; J. G. Smith; J. P. Venuti; E. von Goeler; H. B. Wald; Roy Weinstein; D. E. Wiser; R. W. Zdarko

doi:10.1103/PhysRevLett.55.1831

Precision Measurement of Electroweak Effects in $e^{+} e^{-} \to μ^{+} μ^{-}$ at $\sqrt{s} = 29$ GeV

W. W. Ash, H. R. Band, H. T. Blume, T. Camporesi, G. B. Chadwick, S. H. Clearwater^*, R. W. Coombes, M. C. Delfino, E. Fernandez^† et al.

W. T. Ford, M. W. Gettner, G. P. Goderre, D. E. Groom, B. K. Heltsley^‡, R. B. Hurst, J. R. Johnson, K. H. Lau, T. L. Lavine, R. E. Leedy, I. Lippi^§, T. Maruyama, R. L. Messner, J. H. Moromisato, L. J. Moss, F. Muller^∥, H. N. Nelson, I. Peruzzi, M. Piccolo, R. Prepost, N. Qi, A. L. Read, Jr., D. M. Ritson, L. J. Rosenberg, W. D. Shambroom^¶, J. C. Sleeman, J. G. Smith, J. P. Venuti, E. von Goeler, H. B. Wald, Roy Weinstein, D. E. Wiser, and R. W. Zdarko

Department of Physics, University of Colorado, Boulder, Colorado 80309 Instituto Nazionale di Física Nucleare, Laboratori Nazionali di Frascati, Frascati, Italy Department of Physics, University of Houston, Houston, Texas 77004 Department of Physics, Northeastern University, Boston, Massachusetts 02115 Department of Physics and Stanford Linear Accelerator Center, Stanford University, Stanford, California 94305 Department of Physics, University of Utah, Salt Lake City, Utah 84112 Department of Physics, University of Wisconsin, Madison, Wisconsin 53706

^*Present address: Los Alamos National Laboratory, Los Alamos, N.Mex. 87545.
^†Present address: Universidad Autónoma de Barcelona, Barcelona, Spain.
^‡Present address: Laboratory of Nuclear Studies, Cornell University, Ithaca, N.Y. 14853.
^§Present address: Instituto Nazionale di Física Nucleare, Sezione di Padova, Padova, Italy.
^∥Permanent address: CERN, Geneva, Switzerland.
^¶Joint appointment: Department of Physics and College of Computer Science, Northeastern University, Boston, Mass. 02115.

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Phys. Rev. Lett. 55, 1831 – Published 28 October, 1985

DOI: https://doi.org/10.1103/PhysRevLett.55.1831

Abstract

A high-statistics measurement has been made of the process $e^{+} e^{-} \to μ^{+} μ^{-}$ at $\sqrt{s} = 29$ GeV with the MAC detector at the SLAC storage ring PEP. The electroweak forward-backward charge asymmetry for a sample of approximately 16 000 events was measured to be $A_{μ μ} = - 0.063 \pm 0.008 \pm 0.002$ . The ratio of the cross section to the lowest-order QED cross section was measured to be $R_{μ μ} = 1.01 \pm 0.01 \pm 0.03$ . From these results the weak neutral axial-vector and vector couplings are determined to be $g_{A}^{e} g_{A}^{μ} = 0.25 \pm 0.03 \pm 0.01$ and $g_{V}^{e} g_{V}^{μ} = - 0.02 \pm 0.03 \pm 0.09$ .

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Precision Measurement of Electroweak Effects in $e^{+} e^{-} \to μ^{+} μ^{-}$ at $\sqrt{s} = 29$ GeV

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Precision Measurement of Electroweak Effects in e+e−→μ+μ− at s=29 GeV

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Precision Measurement of Electroweak Effects in $e^{+} e^{-} \to μ^{+} μ^{-}$ at $\sqrt{s} = 29$ GeV