fK/fpi Ratio from QCD Sum Rules


Using the correlation function of the axial vector mesons, we present a QCD sum rule calculation for the decay constants fπ and fK. Our calculations are only weakly dependent on the SU(3)-breaking parameter for the QCD vacuum and give the ratio fK/fπ = 1.11 ± 0.02.

J. Korean Phys. Soc.