Elsevier

Physics Letters B

Volume 331, Issues 1–2, 30 June 1994, Pages 227-235
Physics Letters B

Measurements of cross section and charge asymmetry for e+eμ+μ and e+eτ+τ at s = 57.8 GeV

https://doi.org/10.1016/0370-2693(94)90967-9Get rights and content

Abstract

With data corresponding to 142 pb−1 accumulated at s = 57.8 GeV by the AMY detector at TRISTAN we measure the cross section of the reactions e+eμ+μ and e+eτ+τ and the symmetry in the angular distributions. For the lowest order cross section we obtain σμμ = 27.54 ± 0.65 ± 0.95 pb and σττ = 28.27 ± 0.87 ± 0.69 pb, and for the forward-backward asymmetry, Aμμ = 0.303 ± 0.027 ± 0.008 and Aττ = −0.291 ± 0.040 ± 0.019. These measurements agree with the standard model. Assuming eμτ univrsality we extract the vector and axial coupling constants | | = 0.00 ± 0.09 and |gA| = 0.476 ± 0.024. A fit of data to composite models places lower bounds (95% confidence level) on the compositeness scale of 2–4 TeV.

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