Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2010-09-26
JHEP 1101:107,2011
Physics
High Energy Physics
High Energy Physics - Phenomenology
31 pages. Published version
Scientific paper
10.1007/JHEP01(2011)107
Several lattice collaborations performing simulations with 2+1 light dynamical quarks have experienced difficulties in fitting their data with standard Nf=3 chiral expansions at next-to-leading order, yielding low values of the quark condensate and/or the decay constant in the Nf=3 chiral limit. A reordering of these expansions seems required to analyse these data in a consistent way. We discuss such a reordering, known as Resummed Chiral Perturbation Theory, in the case of pseudoscalar masses and decay constants, pion and kaon electromagnetic form factors and Kl3} form factors. We show that it provides a good fit of the recent results of two lattice collaborations (PACS-CS and RBC/UKQCD). We describe the emerging picture for the pattern of chiral symmetry breaking, marked by a strong dependence of the observables on the strange quark mass and thus a significant difference between chiral symmetry breaking in the Nf=2 and Nf=3 chiral limits. We discuss the consequences for the ratio of decay constants F_K/F_pi and the Kl3 form factor at vanishing momentum transfer.
Bernard Véronique
Descotes-Genon Sebastien
Toucas Guillaume
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