Does the 2d Higgs-Yukawa Model Have a Symmetric Phase at Small Yukawa Coupling Region?

Abstract

We show that at arbitrary value of the scalar self coupling and small Yukawa coupling $y$ the 2d Higgs-Yukawa model with Z(2) symmetry remains in the broken phase and the model is asymptotically free: $y\to 0$ as the cut-off $\Lambda \to \infty$. This is in agreement with a recent conjecture based on numerical simulation results.

Comments: 6 pages, 1 postscript figure attached, BUHEP-93-1