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Abstract: With a sufficiently high number of fundamental fermionic flavours present,Yang-Mills theory develops an infrared fixed point and becomesquasi-conformal in nature. The range of flavour numbers for which this occursdefines the conformal window, the lower limit of which has yet to bedetermined. We studied the phase diagram of SU3 Yang-Mills theory with twelveflavours of staggered fermions. Here we present evidence for the occurrence ofa bulk transition towards a chirally broken phase and the existence of aCoulomb phase on the symmetric side of this transition, using results from themeasurements of the chiral condensate and spectrum, leading to thedetermination of a positive sign of the beta function. Assuming the validity ofthe Appelquist-Miransky-Yamawaki scenario, this implies the existence of aconformal window that comprises the theory under investigation.



Autor: Albert Deuzeman, Maria Paola Lombardo, Elisabetta Pallante

Fuente: https://arxiv.org/







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