%0 Journal Article
%T Measuring the Top Yukawa coupling to a heavy Higgs boson at future e+e- Linear Colliders
%A Juan Alcaraz
%A Ester Ruiz Morales
%J Physics
%D 2000
%I arXiv
%R 10.1103/PhysRevLett.86.3726
%X The determination of the Yukawa coupling of the top quark to the Higgs boson is one of the most important measurements that a future e^+e^- linear collider could provide. For a Higgs boson of mass greater than 350 GeV, this coupling can be determined using the Higgs resonant contribution to t \bar t production from W^+ W^- fusion at TeV energies. We have made a careful evaluation of the significance with which the signal of a Higgs decaying to t \bar t pairs could be observed at future e^+ e^- linear colliders, with center of mass energies close to 1 TeV and an integrated luminosity of 1 ab^{-1}. We find that a signal significance greater than 5 \sigma and a relative error in the top Yukawa measurement better than 10% can be achieved, for Higgs masses in the 350-500 GeV and 350-650 GeV ranges at facilities with 800 GeV and 1 TeV energies respectively.
%U http://arxiv.org/abs/hep-ph/0012109v1