ISSN:
1434-6052
Source:
Springer Online Journal Archives 1860-2000
Topics:
Physics
Notes:
Abstract Differential cross sections fore +e−→e +e−, τ+, τ- measured with the CELLO detector at $$\left\langle {\sqrt s } \right\rangle = 34.2GeV$$ have been analyzed for electroweak contributions. Vector and axial vector coupling constants were obtained in a simultaneous fit to the three differential cross sections assuming a universal weak interaction for the charged leptons. The results,v 2=−0.12±0.33 anda 2=1.22±0.47, are in good agreement with predictions from the standardSU(2)×U(1) model for $$\sin ^2 \theta _w = 0.228$$ . Combining this result with neutrino-electron scattering data gives a unique axial vector dominated solution for the leptonic weak couplings. Assuming the validity of the standard model, a value of $$\sin ^2 \theta _w = 0.21_{ - 0.09}^{ + 0.14}$$ is obtained for the electroweak mixing angle. Additional vector currents are not observed (C〈0.031 is obtained at the 95% C.L.).
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01577097
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