Study of the Higgs-Yukawa theory in the strong-Yukawa coupling regime

Abstract

In this article, we present an ongoing lattice study of the Higgs-Yukawa model, in the regime of strong-Yukawa coupling, using overlap fermions. We investigated the phase structure in this regime by computing the Higgs vacuum expectation value, and by exploring the finite-size scaling behaviour of the susceptibility corresponding to the magnetisation. Our preliminary results indicate the existence of a second-order phase transition when the Yukawa coupling becomes large enough, at which the Higgs vacuum expectation value vanishes and the susceptibility diverges.

Comments: 7 pages, 3 figures, 1 table. Talk presented at the XXIX International Symposium on Lattice Field Theory - Lattice 2011, Lake Tahoe, California, USA