On the bound state problem in 1+1 dimensional field theories

M. Karowski
1979 Nuclear Physics B  
In the framework of factorizing S-matrices in If 1 dimensions, further restrictions for the construction of S-matrices are discussed. A relation between residues of Smatrix poles and the parities of corresponding bound states is derived. ' For reviews see ref. [lb] and references therein.
doi:10.1016/0550-3213(79)90600-x fatcat:2ghqqpg7kfbwjb6zccuq65oiz4