The e+e−→P1P2γ processes close to the Φ peak: toward a model-independent analysis

We discuss the general decomposition and possible general parameterizations of the processes e+e−→γ*→P1P2γ, where P1P2 = π0π0, π0η, or π+π−, for s1/2 ≈ MΦ. Particular attention is devoted to the amplitude where the two pseudoscalar mesons are in a JCP = 0++ state, where we propose a general parameterization which should help to shed light on the nature of light scalar mesons.