title: Scattering amplitudes with open loops.
abstract: 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 predictions for a very wide range of collider processes.
authors.affiliation: Institut für Theoretische Physik, Universität Zürich, 8057 Zürich, Switzerland.
authors.forename: F
authors.initials: F
authors.lastname: Cascioli
authors.forename: P
authors.initials: P
authors.lastname: Maierhöfer
authors.forename: S
authors.initials: S
authors.lastname: Pozzorini