Scattering amplitudes with open loops.

@article{Cascioli2012ScatteringAW,
  title={Scattering amplitudes with open loops.},
  author={F. Cascioli and P. Maierh{\"o}fer and S. Pozzorini},
  journal={Physical review letters},
  year={2012},
  volume={108 11},
  pages={
          111601
        }
}
We introduce a new technique to generate scattering amplitudes at one loop. Traditional tree algorithms, which handle diagrams with fixed momenta, are promoted to generators of loop-momentum polynomials that we call open loops. Combining open loops with tensor-integral and Ossola-Papadopoulos-Pittau reduction results in a fully flexible, very fast, and numerically stable one-loop generator. As demonstrated with nontrivial applications, the open-loop approach will permit us to obtain precise… Expand

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