How far can you go ? Surprises and pitfalls in three-flavour chiral extrapolations

Details How far can you go ? Surprises and pitfalls in three-flavour chiral extrapolations How far can you go ? Surprises and pitfalls in three-flavour chiral extrapolations

2007-09-03

arxiv.org/abs/0709.0265v1

PoSLAT2007:070,2007

Physics

High Energy Physics

High Energy Physics - Lattice

7 pages, 4 figures, Presented at the XXV International Symposium on Lattice Field Theory, July 30 - August 4 2007, Regensburg,

Scientific paper

The presence of strange sea quark pairs may have a significant impact of the pattern of chiral symmetry breaking : in particular large differences can occur between the chiral limits of two and three massless flavours (i.e., whether $m_s$ is kept at its physical value or sent to zero). We recall some indications of such a scenario in QCD, in relation with the peculiar dynamics of the scalar sector. We explain how this could affect the convergence of three-flavour chiral series, commonly used to extrapolate the results of lattice simulations. Finally, we indicate how lattice simulations with three dynamical flavours could unveil such an effect through the quark-mass dependence of light meson masses and decay constants.

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