Title:	Two-variable lorentz-group expansions of physical scattering amplitudes for particles with arbitrary spins
Authors:	Shukre, C.S. Winternitz, P.
Issue Date:	1972
Publisher:	American Physical Society
Citation:	Physical Review D, 1972, Vol.6, p3592-3606
Abstract:	Two-variable expansions of relativistic scattering amplitudes that have previously been suggested for the scattering and decays of spinless particles are generalized to the case of two-body scattering of particles with arbitrary spins. The usual helicity amplitudes are expanded in terms of the transformation matrices of the homogenous Lorentz group in a basis, corresponding to the group reduction O(3,1)⊃O(3)⊃O(2). The expansion can be interpreted as the usual Jacob and Wick partial-wave expansion, in which the energy dependence of the partial-wave helicity amplitudes is further expanded in terms of the O(3,1) d functions. Restrictions due to parity and time-reversal invariance are discussed. The O(3,1) expansions are shown to have the correct threshold behavior "term by term". Further generalizations of the formalism to include O(2,1) expansions (and thus Regge-pole theory) are discussed as well as applications to particle decays (these will be presented separately).
Description:	Restricted Access.
URI:	http://hdl.handle.net/2289/5207
ISSN:	1550-7998 1550-2368(Online)
Alternative Location:	http://adsabs.harvard.edu/abs/1972PhRvD...6.3592S http://arxiv.org/abs/10.1103/PhysRevD.6.3592
Copyright:	1972 American Physical Society
Appears in Collections:	Research Papers (A&A)

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