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We compute celestial amplitudes corresponding to the exact S-matrix of the 2dO(N)-symmetric nonlinear sigma model. Celestial amplitudes for two-dimensionalintegrable S-matrices simplify to Fourier transforms. Due to the connectionbetween Fourier and Mellin transforms, celestial amplitudes for O(N) model areMejer G-functions. We also prove crossing symmetry for obtained results andreview simplifications for O(3) symmetry case.

Celestial amplitudes dual to the O(N) nonlinear sigma model