Speaker
Description
In this work we explore the phenomenological implications at future e+e− colliders of assuming anomalous couplings of the Higgs boson to gauge bosons HVV and HHVV (V = W, Z) given by the κ-modifiers with respect to the Standard Model couplings, κV and κ2V, respectively. For this study we use the Higgs Effective Field Theory (HEFT) where these two κ parameters are identified with the two most relevant effective couplings at leading order, concretely a = κV and b = κ2V . Our focus is put on these two couplings and their potential correlations which we believe carry interesting information on the underlying ultraviolet theory. The particular studied process is e+e− → HHν¯ν, where the vector boson scattering subprocess WW → HH plays a central role, specially at the largest planned energy colliders. Our detailed study of this process as a function of the energy and the angular variables indicates that the produced Higgs bosons in the BSM scenarios will have in general a high transversality as compared to the SM case if κV^2 is different from κ2V. In order to enhance the sensitivity to these HEFT parameters κV and κ2V and their potential correlations we propose here some selected differential cross sections for the e+e− → HHν¯ν process where different kinematic properties of the BSM case with respect to the SM are manifested. Finally, we will focus on the dominant Higgs decays to b¯b pairs leading to final events with 4 b-jets and missing transverse energy
from the undetected neutrinos and will provide the expected accessibility to the (κV , κ2V) effective couplings and their potential correlations. In our study we will consider the three projected energies for e+e− colliders of 500 GeV, 1000 GeV and 3000 GeV.
