Abstract
The sector of decay constants of the octet of light pseudoscalar mesons in the framework of ‘resummed’ SU(3) chiral perturbation theory is investigated. A theoretical prediction for the decay constant of eta -meson is compared to a range of available determinations. Compatibility of these determinations with the latest fits of the SU(3) low energy coupling constants is discussed. Using a Bayesian statistical approach, constraints on the low energy coupling constants L_4^r and L_5^r, as well as higher order remainders to the decay constants F_K and F_eta , are extracted from the most recent experimental and lattice QCD inputs for the values of the decay constants.
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