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Odd-intrinsic-parity processes within the Resonance Effective Theory of QCD

P. D. Ruiz-Femenia·A. Pich·J. Portoles
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Abstract

We 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.

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P. D. Ruiz-Femenia, A. Pich, J. Portoles. 2003-06-17. Odd-intrinsic-parity processes within the Resonance Effective Theory of QCD. https://doi.org/10.1088/1126-6708%2F2003%2F07%2F003

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