Cross-Symmetric Expansion of ππ Amplitude Near Threshold
A. A. Bolokhov, T. A. Bolokhov, I. S. Manida, M. V. Polyakov, S. G. Sherman
Abstract
The near-threshold expansion of the ππ amplitude is developed using the crossing-covariant independent variables. The independent threshold parameters entering the real part of the amplitude in an explicitly Lorentz-invariant way are free from restrictions of isotopic and crossing symmetries. Parameters of the expansion of the imaginary part are recovered by the perturbative unitarity relations.
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