On the massless tree-level S-matrix in 2d sigma models

  title={On the massless tree-level S-matrix in 2d sigma models},
  author={Ben Hoare and Nat Levine and Arkady A. Tseytlin},
  journal={Journal of Physics A: Mathematical and Theoretical},
Motivated by the search for new integrable string models, we study the properties of massless tree-level S-matrices for 2d -models expanded near the trivial vacuum. We find that, in contrast to the standard massive case, there is no apparent link between massless S-matrices and integrability: in well-known integrable models the tree-level massless S-matrix fails to factorize and exhibits particle production. Such tree-level particle production is found in several classically integrable models… 

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