Charge asymmetry and weak interaction effects in e+e-→μ+μ- and e+e-→τ+τ-

Charge asymmetry and weak interaction effects in e+e-→μ+μ- and e+e-→τ+τ-

We have measured, at an average centre-of-mass energy of 34.22 GeV a forward-backward charge asymmetry in the reaction e+e-→μ+μ- of value -0.161 ± 0.032. This demonstrates the existence of an axial vector neutral current with coupling strength of geagμa=0.53 ± 0.10. We have also obtained a limit on...

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Bibliographic Details
Main Authors: Brandelik, R, Braunschweig, W, Gather, K, Kirschfink, F, Lübelsmeyer, K, Martyn, H, Peise, G, Rimkus, J, Sander, H, Schmitz, D, Trines, D, Wallraff, W, Boerner, H, Fischer, H, Hartmann, H, Hilger, E, Hillen, W, Knop, G, Köpke, L, Kolanoski, H, Löhr, B, Wedemeyer, R, Wermes, N, Wollstadt, M, Burkhardt, H
Format: Journal article
Language:English
Published: 1982
Description
Summary:We have measured, at an average centre-of-mass energy of 34.22 GeV a forward-backward charge asymmetry in the reaction e+e-→μ+μ- of value -0.161 ± 0.032. This demonstrates the existence of an axial vector neutral current with coupling strength of geagμa=0.53 ± 0.10. We have also obtained a limit on the vector coupling strength of gevgμv<0.12. The Weinberg angle is found to be sin2θW=0.29+0.09-0.11. From the reaction e+e-→τ+τ- we have found geagτa<0.34, gevgτv<0.55. © 1982.

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