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Universidad de Granada CAFPE

Seminario: NNLO corrections in four dimensions

Ponente: Roberto Pittau, High Energy Theory Group, UGR

Lugar: Seminario del Dpto Física Teórica y del Cosmos

Fecha: 16/10/2018

Hora (24h): 16:00

Four Dimensional Renormalization (FDR) provides a framework to compute renormalized quantities bypassing UV subtractions at the Lagrangian level. We describe how NNLO final state quark-pair corrections are computed in FDR by directly enforcing gauge invariance and unitarity in the definition of the regularized divergent integrals. The whole procedure is strictly four-dimensional and a finite renormalization is necessary only to fix bare parameters in terms of physical measurements. We give details of our approach and demonstrate how virtual and real contributions can be merged together without relying on dimensional regularization. As an example, we recompute the "H -> b bbar + jets" and "gamma* -> jets" inclusive rates at the NNLO accuracy in the large N_F limit of QCD.