Cross-Symmetric Expansion of $ππ$ Amplitude Near Threshold

Details Cross-Symmetric Expansion of $ππ$ Amplitude Near Threshold Cross-Symmetric Expansion of $ππ$ Amplitude Near Threshold

1996-12-27

arxiv.org/abs/hep-ph/9612473v1

Phys.Atom.Nucl. 60 (1997) 1511-1521; Yad.Fiz. 60N9 (1997) 1658-1668

Physics

High Energy Physics

High Energy Physics - Phenomenology

17 pages, Latex (uses psfig.sty), 1 Postscript figure, submitted to YaF

Scientific paper

The near-threshold expansion of the $\pi \pi$ 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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