On the prosaic origin of the double poles in the sine-GordonS-matrix

@article{Coleman1978OnTP,
  title={On the prosaic origin of the double poles in the sine-GordonS-matrix},
  author={Sidney A. Coleman and H. J. Thun},
  journal={Communications in Mathematical Physics},
  year={1978},
  volume={61},
  pages={31-39}
}
We show that the apparently exotic double poles in the sine-GordonS-matrix are nothing but ordinary anomalous thresholds. 

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