Low-energy particle physics and chiral extrapolations

Abstract

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.

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

References in corpus (11)

• High Precision determination of the pi, K, D and D_s decay constants from lattice QCD
• Continuum Limit Physics from 2+1 Flavor Domain Wall QCD
• Lattice QCD at the physical point: light quark masses
• Axial Nucleon form factors from lattice QCD
• The ratio FK/Fpi in QCD
• Precision Study of Excited State Effects in Nucleon Matrix Elements
• Results for light pseudoscalar mesons
• Hadron Structure and Form Factors
• Systematic errors in extracting nucleon properties from lattice QCD
• The shape of the static potential with dynamical fermions
• Properties of light pseudoscalars from lattice QCD with HISQ ensembles

Cited by in corpus (3)

• Standard Model Heavy Flavor physics on the Lattice
• Flavor Physics in the LHC era: the role of the lattice
• Finite-size scaling in nucleon axial charge from 2+1-flavor DWF lattice QCD