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In a crossing-symmetric Regge theory with several coupled two-particle channels, there are many-particle absorptive effects due to crossed two-particle processes. Also, some of the partial-wave amplitudes have overlapping left-hand and right-hand cuts in the s-plane, To enforce unitarity in such a theory, one needs a coupled-channel N/D method allowing arbitrary absorption parameters and overlapping cuts. These requirements lead to a nonlinear marginally singular N/D equation, which is proposed as part of a scheme to construct a coupled-channel Regge theory with exact crossing symmetry.

physical review. d. particles, fields, gravitation, and cosmology/physical review. d. particles and fields

Matrix<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mfrac><mml:mrow><mml:mi>N</mml:mi></mml:mrow><mml:mrow><mml:mi>D</mml:mi></mml:mrow></mml:mfrac></mml:math>method with absorption and the unitarity problem in coupled-channel Regge theory

MatrixNDmethod with absorption and the unitarity problem in coupled-channel Regge theory