Abstract
We study the mass, width and couplings of the lightest vector multiplet. Effective field theories based on chiral symmetry and a 1/ N C counting are adopted in order to describe the vector form factor associated to the two-pseudoscalar matrix element of the QCD vector current. The bare poles of the intermediate s -channel resonances are regularised through a Dyson-Schwinger-like summation. This procedure provides many interesting properties, as the pole mass M ρ pole = 764.1 ± 2.7 −2.5 +4.0 MeV and the chiral coupling L 9 τ ( μ 0 ) = (7.04 ± 0.05 −0.27 +0.19 ) · 10 −3 , at μ 0 = 770 MeV. We show how the running affects the resonance parameters and that μ is really unphysical, so saturation occurs at any scale. This talk is mainly based on Ref. 1.
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