SU(2) chiral perturbation theory low-energy constants from 2+1 flavor staggered lattice simulations

Szabolcs Borsányi, Stephan Dürr, Zoltán Fodor, Stefan Krieg, Andreas Schäfer, Enno E. Scholz, Kálmán K. Szabó

Research output: Contribution to journalArticle

34 Citations (Scopus)

Abstract

We extract the next-to-leading-order low-energy constants ℓ̄3 and ℓ̄4 of SU(2) chiral perturbation theory, based on precise lattice data for the pion mass and decay constant on ensembles generated by the Wuppertal-Budapest Collaboration for QCD thermodynamics. These ensembles feature 2+1 flavors of two-fold stout-smeared dynamical staggered fermions combined with Symanzik glue, with pion masses varying from 135 to 435 MeV, lattice scales between 0.7 and 2.0 GeV, while ms is kept fixed at its physical value. Moderate taste splittings and the scale being set through the pion decay constant allow us to restrict ourselves to the taste pseudoscalar state and to use formulas from continuum chiral perturbation theory. Finally, by dropping the data points near 135 MeV from the fits, we can explore the range of pion masses that is needed in SU(2) chiral perturbation theory to reliably extrapolate to the physical point.

Original languageEnglish
Article number014513
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Volume88
Issue number1
DOIs
Publication statusPublished - Jul 24 2013

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Physics and Astronomy (miscellaneous)

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