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Tests of the standard model in leptonic reactions at PETRA energies

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Zeitschrift für Physik C Particles and Fields

Abstract

An analysis of the three leptonic reactionse + e e + e ,μ + μ andτ + τ over a wide range of energy,\(12< \sqrt s< 46.78 GeV\) is presented. The data were obtained with the JADE detector at thee + e storage ring PETRA. They are compared to predictions of electroweak theories, in particular the standard model. For the total cross-sections of all three reactions and for the differential cross-section of Bhabha scattering no deviation from QED is found over the entire energy range. The differential cross-sections of μ and τ pairs at high energies show the angular asymmetry predicted by electroweak interference. The axial-vector and vector weak coupling constant, sin2 θ W andM Z are determined and compared to other measurements. Finally, limits on deviations from the standard model are given.

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JADE Collaboration., Bartel, W., Becker, L. et al. Tests of the standard model in leptonic reactions at PETRA energies. Z. Phys. C - Particles and Fields 30, 371–380 (1986). https://doi.org/10.1007/BF01557600

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