6533b85bfe1ef96bd12ba1a0
RESEARCH PRODUCT
An effective field theory approach to the electroweak corrections at LEP energies
Jose BernabeuArcadi SantamariaD. Gómez DummArif Akhundovsubject
PhysicsNuclear and High Energy PhysicsParticle physicsElectroweak interactionHigh Energy Physics::PhenomenologyFísicaFOS: Physical sciencesObservableHigh Energy Physics - PhenomenologyHigh Energy Physics - Phenomenology (hep-ph)Effective lagrangianEffective field theoryHiggs bosonHigh Energy Physics::ExperimentLimit (mathematics)Particle Physics - Phenomenologydescription
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%.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 1999-03-31 |