- Published 2000

We consider the possibility that after operations at the LHC and e + e ? Linear Colliders a Higgs boson will be discovered, but no signal of New Physics will be found (Standard-Model-like scenario). This can occur in the Standard Model (SM) as well as in other models, including the Two-Higgs-Doublet Model (2HDM), the MSSM, etc. Experiments at a Photon Collider can resolve these cases. In this paper we compare the SM and the 2HDM (II). In the analysis we use as independent quantities the ratios, to the SM values, of couplings of the observed Higgs boson to gauge bosons, and to up and down-type quarks (basic couplings). We derive a relation between these ratios within the 2HDM (II), a pattern relation. With the aid of this relation, diierent possible realizations of an SM-like scenario are found. For these realizations, we calculate the loop couplings of the Higgs boson with and Z, and also with gluons, taking into account the expected accuracy in the measurements of the basic couplings. The obtained deviation of the two-photon width from its SM value is generally higher than the expected inaccuracy in the measurement of ? at a Photon Collider. The result is sensitive to the parameters of the Higgs self interaction.

@inproceedings{Ginzburga2000ResolvingS,
title={Resolving SM - like scenarios via Higgs bosonproduction at a Photon Collider : I . 2 HDM versus SM},
author={Ilya F. Ginzburga and Maria Krawczykb and Per Oslandc},
year={2000}
}