arXiv:hep-ph/9612473·v1·High Energy Physics — Phenomenology
Cross-Symmetric Expansion of Amplitude Near Threshold
A.A. Bolokhov (1)🇷🇺 · T.A. Bolokhov (1)🇷🇺 · I.S. Manida (1)🇷🇺 · M.V. Polyakov (2)🇷🇺 · S.G. Sherman (2) ((1) St. Petersburg State University, (2) St. Petersburg Nuclear Physics Institute)🇷🇺
Abstract
The near-threshold expansion of the 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.
Comments: 17 pages, Latex (uses psfig.sty), 1 Postscript figure, submitted to YaF