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Tests for the asymptotic behaviour of the gamma^* --> gamma pi^0 form factor

Research paper by J. -M. Gerard, G. Lopez Castro

Indexed on: 20 Jan '98Published on: 20 Jan '98Published in: High Energy Physics - Phenomenology



Abstract

The gamma^* --> gamma pi^0 transition measured at different photon virtualities already provides us with a clean test for the behaviour of the pi^0 gamma^* gamma off-shell axial anomaly at large time-like squared momenta. It also allows reliable predictions for the branching ratio of heavy quarkonium decays into omega pi^0.