
pmid: 10030873
Measurements of the ratio R of the purely leptonic weak neutral-current cross sections sigma(..nu../sub ..mu../e..--> nu../sub ..mu../e)/sigma(nu-bar/sub ..mu../e..-->..nu-bar /sub ..mu../e) and of the absolute value of sigma(nu-bar/sub ..mu../e..-->..nu-bar/sub ..mu../e) are reported. These yield R = 1.38/sub -0.31//sup +0.40/(stat) +- 0.17(syst) and sigma(nu-bar/sub ..mu../e..-->..nu-bar/sub ..mu../e)/E..mu.. = (1.16 +- 0.20(stat) +- 0.14(syst)) x 10/sup -42/ cm/sup 2//GeV. This value of R determines the fundamental weak neutral-current parameter to be sin/sup 2/theta/sub W/ = 0.209 +- 0.029(stat) +- 0.013(syst).
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