[SEMINARI]: Dr. Akhundov: An effective field theory approach to the electroweak corrections at LEP energies

[Arcadi Santamaria]

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                              S E M I N A R I

            [Image]    Departament de Física Teòrica     [Image]
                          Universitat de València
                      46100 Burjassot (València) Spain

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

                            Dr. Arif A. Akhundov

                          (Universitat de Valencia)

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                     Aula de Seminaris de Física Teòrica
                  Thursday 17 of June of 1999 at 12:00 AM
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                                    Resum

     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- --> ZZ. 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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