The phase structure of a chirally invariant lattice Higgs-Yukawa model

Abstract

We consider a chirally invariant lattice Higgs-Yukawa model based on the Neuberger overlap operator. As a first step towards the eventual determination of Higgs mass bounds we present the phase structure of the model analytically in the large Nf-limit in the physically interesting region of the Yukawa coupling constant. We confront the analytically obtained phase diagram with corresponding HMC-simulations and find an excellent agreement at large values of Nf. In the opposite case the large Nf computation still gives a good qualitative description of the phase diagram. We also present first and very preliminary results on the Higgs upper bound at one selected cut-off of the theory.

Presented at 25th International Symposium on Lattice Field Theory (Lattice 2007), Regensburg, Germany, Jul,30 - Aug,04 2007. 7 pages, 8 figures