Low-energy particle physics and chiral extrapolations

Details Low-energy particle physics and chiral extrapolations Low-energy particle physics and chiral extrapolations

2012-01-23

arxiv.org/abs/1201.4774v1

Physics

High Energy Physics

High Energy Physics - Lattice

14 pages, plenary talk presented at the XXIX International Symposium on Lattice Field Theory - Lattice 2011 July 10-16, 2011,

Scientific paper

In this review I discuss the role of chiral extrapolations for the determination of several phenomenologically relevant quantities, including light quark masses, meson decay constants and the axial charge of the nucleon. In particular, I investigate whether chiral extrapolations are sufficiently controlled in order to rightfully claim the accuracy which is quoted in recent compilations of these quantities. While this is the case for the masses of the light quarks and the ratio fK/fpi of decay constants, small inconsistencies in the chiral and continuum behaviour of individual decay constants fK and fpi, as well as the hadronic radii r0, r1 remain and must be clarified. In the case of the nucleon axial charge, gA, the chiral behaviour is still poorly understood due to the presence of other systematic effects.

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