Phenomenology of the <VVP> Green's function within the Resonance Chiral Theory
P. D. Ruiz-Femenia, A. Pich, J. Portoles
Abstract
We analyse the odd-intrinsic-parity effective Lagrangian of QCD valid for processes involving one pseudoscalar with two vector mesons described in terms of antisymmetric tensor fields. Substantial information on the odd-intrinsic-parity couplings is obtained by constructing the vector-vector-pseudoscalar Green's three-point function, at leading order in 1/NC, and demanding that its short-distance behaviour matches the corresponding OPE result. The QCD constraints thus enforced allow us to predict the decay amplitude omega -> pi gamma, the O(p6) corrections to pi -> gamma gamma and the slope parameter in pi -> gamma gamma*.
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