Harmonic R matrices for scattering amplitudes and spectral regularization.

  title={Harmonic R matrices for scattering amplitudes and spectral regularization.},
  author={Livia Ferro and Tomasz Łukowski and Carlo Meneghelli and Jan Christoph Plefka and Matthias Staudacher},
  journal={Physical review letters},
  volume={110 12},
Planar N = 4 supersymmetric Yang-Mills theory appears to be integrable. While this allows one to find this theory's exact spectrum, integrability has hitherto been of no direct use for scattering amplitudes. To remedy this, we deform all scattering amplitudes by a spectral parameter. The deformed tree-level four-point function turns out to be essentially the one-loop R matrix of the integrable N = 4 spin chain satisfying the Yang-Baxter equation. Deformed on-shell three-point functions yield… CONTINUE READING
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