The physics of eight flavours

Details The physics of eight flavours The physics of eight flavours

2008-10-09

arxiv.org/abs/0810.1719v1

PoS LATTICE2008:060,2008

Physics

High Energy Physics

High Energy Physics - Lattice

7 pages, 3 figures. Talk presented at the XXVI International Symposium on Lattice Field Theory, July 14-19, 2008, Williamsburg

Scientific paper

When the flavour content of QCD is increased sufficiently, the theory develops a non-trivial infra red fixed point. Thus, for a number of flavours above a certain critical value, but not yet so high that asymptotic freedom is lost, QCD becomes a conformal field theory. The location of the lower limit of this conformal window has not yet been unequivocally determined. Using an improved lattice action, and exploiting modern algorithms allowing for larger lattices and lower quark masses, we have shown that the theory of QCD with eight flavours breaks chiral symmetry in the continuum. We present proof that the accompanying transition is thermal in nature and as a consequence, the conformal window of QCD can only start afterwards, corroborating recent analytical studies at the expense of older results.

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