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- W1520421427 endingPage "039" @default.
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- W1520421427 abstract "We present a dispersive method which allows to investigate the low-energy couplings of chiral perturbation theory at the next-to-leading order (NLO) in the 1/NC expansion, keeping full control of their renormalization scale dependence. Using the resonance chiral theory Lagrangian, we perform a NLO calculation of the scalar and pseudoscalar two-point functions, within the single-resonance approximation. Imposing the correct QCD short-distance constraints, one determines their difference Π(t)≡ΠS(t)−ΠP(t) in terms of the pion decay constant and resonance masses. Its low momentum expansion fixes then the low-energy chiral couplings L8 and C38. At μ0 = 0.77 GeV, we obtain L8r(μ0)SU(3) = (0.6±0.4).10−3 and C38r(μ0)SU(3) = (2±6).10−6." @default.
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- W1520421427 date "2007-01-08" @default.
- W1520421427 modified "2023-10-16" @default.
- W1520421427 title "Towards a determination of the chiral couplings at NLO in 1/NC: L8r(μ) and C38r(μ)" @default.
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- W1520421427 doi "https://doi.org/10.1088/1126-6708/2007/01/039" @default.
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