The Electroweak Sudakov approximation in SHERPA

TL;DR

This paper discusses implementing electroweak Sudakov logarithm approximations in the SHERPA Monte Carlo simulation to enhance high-energy prediction accuracy efficiently, along with an overview of full NLO EW computations.

Contribution

It introduces the implementation of EW Sudakov logarithms in SHERPA and provides initial results and status updates on full NLO EW calculations.

Findings

Successful implementation of EW Sudakov logarithms in SHERPA

Initial results demonstrate improved high-energy predictions

Overview of current NLO EW computation status

Abstract

As experimental particle physics becomes more and more precise, it is becoming increasingly important for Monte Carlo simulations to improve the precision of their predictions. In terms of the hard matrix element, this means calculating to a higher order in perturbation theory. To be consistent this requires both NNLO QCD corrections and NLO EW corrections to be included. There are also interference effects between these processes that are not simple to handle consistently. For a broad description of the behaviour of NLO EW corrections at high energies, the Sudakov logarithmic approach provides a good approximation, and is much less computationally expensive than the full calculation. The implementation of EW Sudakov logarithms within the SHERPA program are outlined here along with some initial results. As well as this, an overview of the status of full NLO EW computations with SHERPA is presented.