出版社：SISSA, Scuola Internazionale Superiore di Studi Avanzati
摘要：We measure the pion mass and decay constant on ensembles generated by the Wuppertal- Budapest Collaboration, and extract the NLO low-energy constants ¯ l3 and ¯ l4 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 ms 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.
