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Germán F. R. Sborlini
(Instituto de Física Corpuscular, IFIC)
Seminar Room 1.1.1 (IFIC)
Seminar Room 1.1.1
The computation of higher-order corrections to QCD observables requires to combine virtual and real contributions. Virtual terms involve diagrams containing loops, whilst real contributions are obtained by the integration of scattering amplitudes with additional external legs. Loop-tree duality allows to express virtual contributions in terms of phase-space integrals, thus leading to a direct comparison with real radiation terms. In this talk, we review the basis of the method and describe its application to regularize Feynman integrals. Performing an integrand-level combination of real and virtual terms, we obtain finite contributions that can be computed in four-dimensions. A natural physical interpretation of infrared singularities is provided by this method, since they are originated in the intersection of some light-cones in momentum space. As an example, we describe the regularization of a massless triangle.