Abstract: Abstract A new approach to the problem of constraining the scattering amplitudes by using axiomatically proved properties of unitarity, analyticity and crossing is developed. It is applied to obtain absolute and semi-phenomenological bounds on the π 0 π 0 amplitude at points lying on the Mandelstam triangle, in particular at the physical threshold (scattering length) and at the symmetric point (which is used to define the coupling constant). We have already reported a less general and powerful approach which improved the previous results in t...
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Topics: 
Mathematical analysis
Mathematical physics