Interference Effects in Higgs production through Vector Boson Fusion in the Standard Model and its Singlet Extension

摘要

Interference effects play an important role in Electroweak Physics. They areresponsible for the restoration of unitarity al large energies. When, as isoften the case, higher order corrections are only available for some particularsubamplitude, interferences need to be carefully computed in order to obtainthe best theoretical prediction. In the new proposal to estimate the totalHiggs width from the off shell cross section, the interference between theHiggs signal and the background is essential. It has been recently pointed outin gluon fusion that whenever more than one neutral, CP even, scalars arepresent in the spectrum large cancellations can occur. We extend these studiesto Vector Boson Scattering, examining interference effects in the Higgs sectorin the Standard Model and its one Higgs Singlet extension.