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19 páginas, 4 figuras.-- arXiv:hep-ph/0306157v1We analyse the most general odd-intrinsic-parity effective Lagrangian of QCD valid for processes involving one pseudoscalar with 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 -> pion gamma, and the O(p^6) corrections to pion -> gamma gamma. Noteworthy consequences concerning the vector meson dominance assumption in the decay omega -> 3 pions are also extracted from the previous analysis.The work of P. D. Ruiz-Femenía has been partially supported by a FPU scholarship of\udthe Spanish Ministerio de Educación y Cultura. J. Portolés is supported by a "Ramón y Cajal" contract with CSIC funded by MCYT. This work has been supported in part\udby TMR EURIDICE, EC Contract No. HPRN-CT-2002-00311, by MCYT (Spain) under\udgrant FPA2001-3031, and by ERDF funds from the European Commission.Peer reviewe

Odd-intrinsic-parity processes within the resonance effective theory of QCD