Report on: Conformal or Walking? Monte Carlo renormalization group studies of SU(3) gauge models with fundamental fermions

by Rajiv Gavai

Friday 30 Apr 2010, 11:30 → 12:30 Asia/Kolkata

A-304 (Colaba Campus)

Title: Conformal or Walking? Monte Carlo renormalization group studies of SU(3) gauge models with fundamental fermions Authors: Anna Hasenfratz Abstract: Strongly coupled gauge systems with many fermions are important in many phenomenological models. I use the 2-lattice matching Monte Carlo renormalization group method to study the fixed point structure and critical indexes of SU(3) gauge models with 8 and 12 flavors of fundamental fermions. With an improved renormalization group block transformation I am able to connect the perturbative and confining regimes of the N_f=8 flavor system, thus verifying its QCD-like nature. With N_f=12 flavors the data favor the existence of an infrared fixed point and conformal phase, though the results are also consistent with very slow walking. I measure the anomalous mass dimension in both systems at several gauge couplings and find that they are barely different from the free field value.

Paper http://in.arxiv.org/abs/1004.1004