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Scattering Amplitudes with Open Loops · Around

2011

Scattering Amplitudes with Open Loops

Cascioli, Fabio, Maierhöfer, Philipp, Pozzorini, Stefano

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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 OPP reduction results in a fully flexible, very fast, and numerically stable one-loop generator.
As demonstrated with non-trivial applications, the open-loop approach will permit to obtain precise predictions for a very wide range of collider processes.

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