Determining chiral couplings at NLO
نویسنده
چکیده
We present a general method that allows to estimate the low-energy constants of Chiral Perturbation Theory up to next-to-leading corrections in the 1/NC expansion, that is, keeping full control of the renormalization scale dependence. As a first step we have determined L8 and C38, the couplings related to the difference of the two-point correlation functions of two scalar and pseudoscalar currents, L8(μ0) = (0.6±0.4) · 10−3 and Cr 38(μ0) = (2±6) · 10−6, with μ0 = 0.77 GeV. As in many effective approaches, one of the main ingredients of this method is the matching procedure: some comments related to this topic are presented here.
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