Model independent constraints on four-lepton operators

摘要

We obtain constraints on four-lepton interactions in the effective fieldtheory with dimension-6 operators. To this end, we combine the experimentalinput from Z boson measurements in LEP-1, W boson mass and decays, muon and taudecays, lepton pair production in LEP-2, neutrino scattering on electrons, andparity violating electron scattering. The analysis does not rely on anyassumptions about the flavor structure of the dimension-6 operators. Our mainresults are the confidence intervals for Wilson coefficients of 16lepton-flavor conserving four-lepton operators, together with the fullcorrelation matrix. Consequences for leptophilic models beyond the StandardModel are discussed.