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

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

2003-06-17

arxiv.org/abs/hep-ph/0306157v1

JHEP 0307 (2003) 003

Physics

High Energy Physics

High Energy Physics - Phenomenology

20 pages, 4 figures

Scientific paper

10.1088/1126-6708/2003/07/003

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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