Constraining Anomalous Higgs Interactions
Universidade de Sao Paulo and IPhT
Mercredi 09/01/2013, 14:15
Salle Claude Itzykson, Bât. 774, Orme des Merisiers
We study the indirect effects of new physics on the phenomenology of the recently discovered ``Higgs-like'' particle. In a model independent framework these effects can be parametrized in terms of an effective Lagrangian at the electroweak scale. In a theory in which the $SU(2)_L x U(1)_Y$ gauge symmetry is linearly realized they appear at lowest order as dimension--six operators, containing all the SM fields including the light scalar doublet, with unknown coefficients. We discuss the choice of operator basis which allows us to make better use of all the available data to determine the coefficients of the new operators. We illustrate our present knowledge of those by performing a global 5--parameter fit to the existing data which allows simultaneous determination of the Higgs couplings to gluons, electroweak gauge bosons, bottom quarks, and tau leptons.
Contact : ccaprini