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

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

2011-11-16

arxiv.org/abs/1111.3729v1

PoS(Lattice2011)142

Physics

High Energy Physics

High Energy Physics - Lattice

7 pages, contribution to Lattice 2011, Squaw Valley, Lake Tahoe, California, July 2011

Scientific paper

We measure the pion mass and decay constant on ensembles generated by the Wuppertal-Budapest Collaboration, and extract the NLO low-energy constants l_3 and l_4 of SU(2) chiral perturbation theory. The data are generated in 2+1 flavor simulations with Symanzik glue and 2-fold stout-smeared staggered fermions, with pion masses varying from 135 MeV to 400 MeV, lattice scales between 0.7 GeV and 2.0 GeV, and m_s kept at its physical value. Furthermore, by excluding the lightest mass points, we are able to test the reliability of SU(2) chPT as a tool to extrapolate towards the physical point from higher pion masses.

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