Traces of a fixed point: Unravelling the phase diagram at large Nf

Details Traces of a fixed point: Unravelling the phase diagram at large Nf Traces of a fixed point: Unravelling the phase diagram at large Nf

2009-11-11

arxiv.org/abs/0911.2207v1

PoS LAT2009:044,2009

Physics

High Energy Physics

High Energy Physics - Lattice

7 pages, 4 figures. Parallel talk presented at the XXVII International Symposium on Lattice Field Theory, July 26-31, 2009, Pe

Scientific paper

With a sufficiently high number of fundamental fermionic flavours present, Yang-Mills theory develops an infrared fixed point and becomes (quasi-)conformal in nature. The range of flavour numbers for which this occurs defines the conformal window, the lower limit of which has yet to be determined. We studied the phase diagram of SU(3) Yang-Mills theory with twelve flavours of staggered fermions. Here we present evidence for the occurrence of a bulk transition towards a chirally broken phase and the existence of a Coulomb phase on the symmetric side of this transition, using results from the measurements of the chiral condensate and spectrum, leading to the determination of a positive sign of the beta function. Assuming the validity of the Appelquist-Miransky-Yamawaki scenario, this implies the existence of a conformal window that comprises the theory under investigation.

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