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Searches for electroweak γ-Z-Z’ interference at the LEP2 e + e − collider

  • Elementary Particles and Fields
  • Theory
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Abstract

Indirect effects of the Z’ boson in the process e + e − → μ+μ− as implemented at the LEP2 electron-positron collider are investigated in terms of new integrated observables σ±. It is demonstrated that these observables furnish more definitive information about Z’-boson effects than the canonical observables σ± and A FB. It is established that the deviations Δσ± induced by Z’ bosons show a specific energy dependence, which is determined primarily by the parameters of the Standard Model. This permits making unambiguous model-independent predictions. In particular, two points, \(\sqrt {s_ + } \approx 78GeV\) and \(\sqrt {s_ - } \approx 113GeV\), are determined at which, respectively, σ+ and σ− vanish both in the Standard Model and in presence of the extra Z’ boson. These energy values can be of use in searches for phenomenological manifestations of alternative sources of new physics that are different from Z’.

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  1. P. Sukhoi State Technical University, Gomel, Belarus

    A. A. Pankov

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  1. A. A. Pankov
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__________

Translated from Yadernaya Fizika, Vol. 63, No. 5, 2000, pp. 940–952.

Original Russian Text Copyright © 2000 by Pankov.

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Pankov, A.A. Searches for electroweak γ-Z-Z’ interference at the LEP2 e + e − collider. Phys. Atom. Nuclei 63, 870–881 (2000). https://doi.org/10.1134/1.855718

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