An effective field theory approach to the electroweak corrections at LEP energies

Details An effective field theory approach to the electroweak corrections at LEP energies An effective field theory approach to the electroweak corrections at LEP energies

1999-03-31

arxiv.org/abs/hep-ph/9903546v2

Nucl.Phys. B563 (1999) 82-96

Physics

High Energy Physics

High Energy Physics - Phenomenology

17 pages incl. 2 eps figures, REVTeX. New references added and few misprints corrected

Scientific paper

10.1016/S0550-3213(99)00565-9

In the framework of the effective field theory (EFT) we discuss the electroweak (EW) corrections at LEP energies. We obtain the effective Lagrangian in the large m_t limit, and reproduce analytically the dominant EW corrections to the LEP2 processes e+ e- --> gamma Z and e+ e- --> Z Z. To include effects of finite top-quark and Higgs masses, we use the effective Lagrangian at tree level and fit LEP1/SLD observables with four arbitrary parameters, plus alpha_s(m_Z). The EFT approach works remarkably well. Using the effective couplings determined from the fit, and tree-level EFT formulae, we predict the cross sections for e+ e- --> Z Z, gamma Z at a level better than 1%.

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