One-loop electroweak Sudakov logarithms: a revisitation and automation

by Davide Pagani (Universita e INFN, Bologna (IT))

Thursday 28 Apr 2022, 14:00 → 15:00 Europe/Zurich

Aula Polvani (Dipartimento di Fisica, Università degli Studi di Milano)

At high energies, electroweak (EW) radiative corrections are dominated by the so-called EW Sudakov logarithms, becoming negative and large in absolute value. In this talk I will present a revisitation of the algorithm of Denner and Pozzorini (DP) for the calculation of one-loop electroweak Sudakov logarithms. With our revisitation, we have added several novelties to the DP algorithm. For instance, we have obtained a substantial improvement of the approximation of those logarithms that are angular dependent. Moreover, we have identified an imaginary term that has been so far omitted in the literature and that instead cannot be neglected for 2 —> n processes with n > 2. I will discuss results that we have obtained in a completely automated approach via the implementation of our revisitation of the DP algorithm in the MadGraph5_aMC@NLO framework. After having discussed the case of one-loop amplitudes I will move to the case of NLO EW corrections to physical observables and cross sections. I will introduce a new approach in which the QED component is consistently removed, showing how this approach can be superior to those commonly used for approximating physical observables and cross sections at high energies.

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