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T: Teilchenphysik

T 505: QFT II

T 505.1: Group Report

Thursday, March 30, 2006, 16:20–16:40, C2-02-176

Higgs mass bounds from renormalization flow — •Clemens Gneiting and Holger Gies — Institut für Theoretische Physik, Universität Heidelberg, Philosophenweg 16, D-69120 Heidelberg

We use a functional renormalization group (RG) equation to determine the RG flow of a Higgs-Yukawa toy model mimicking the Standard Model. We show that for a given ultraviolet cutoff a finite infrared Higgs mass range emerges naturally from the RG flow itself. In agreement with naive expectations the Higgs mass bounds become more narrow for larger cutoff values. Higgs masses outside the resulting bounds cannot be connected to any conceivable set of bare parameters in the standard-model universality class. For our results, no further physical assumptions have to be imposed in contrast to many earlier investigations that utilize validity bounds of computational techniques or unphysical instability scenarios.