Elsevier

Physics Letters B

Volume 99, Issue 3, 19 February 1981, Pages 281-286
Physics Letters B

Experimental limits on the strength of weak neutral currents in lepton pair production at PETRA energies

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Abstract

The processes e+e → e+e and μ+μ have been studied at PETRA using the JADE detector. The data, which were collected at s-values of up to 1300 GeV2 have been analysed in terms of an electro-weak extension of QED to obtain values for the weak vector and axial vector couplings in the lepton sector. The values obtained agree with the predictions of the standard Salam-Weinberg model and the data are further analysed in terms of this model to obtain the limits 0.10 < sin2 ϑw < 0.40 (68% CL). The mass of the neutral weak gauge boson is deduced to be greater than 51 GeV/c2.

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This experiment was supported by the UK Science Research Council through the Rutherford Laboratory, by the Education Ministry of Japan and by the Bundesministerium für Forschung und Technologie.

4

We are indebted to the PETRA machine group for their excellent support during the experiment and to all the engineers and technicians of the collaborating institutions who have participated in the construction and maintenance of the apparatus. The visiting groups at DESY wish to thank the DESY directorate for their hospitality.

1

Present address: Purdue University, Indianapolis, IN, USA.

2

Present address: Texaco AG, Hamburg, Germany.

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