The EW Sudakov approximation in SHERPA

Apr 13, 2016, 5:50 PM
15m
SR4b (DESY Hamburg)

SR4b

DESY Hamburg

Electroweak Physics and Beyond the Standard Model WG3 Electroweak Physics and Beyond the Standard Model

Speaker

Dr Jennifer Thompson (II. Physikalisches Institut, Georg-August-Universitaet Goettingen)

Description

Monte Carlo event generators are currently very important tools for the comparison between theory and experiment at particle colliders. Today, these tools typically reach NLO precision in QCD for the fixed-order matrix element. In order to improve this precision, Monte Carlo event generators must compute to NLO in EW as well as to NNLO in QCD. The inclusion of a full NLO EW calculation is computationally expensive and is also non-trivial to include on top of a NLO QCD calculation. It is, however, possible to include the most dominant terms of the NLO EW calculation in the high-energy limit without the overhead of performing the complete calculation. These dominant terms are the large logarithms, called 'EW Sudakov logarithms', which result from the soft-collinear limit of weak boson exchange. Unlike in QCD and QED, the mass of the weak bosons introduces a natural cut-off, which leaves these logarithms large and finite in the high-energy regime. This talk presents the implementation of these logarithms as a K-factor to the underlying Born process within the SHERPA Monte Carlo event generator.

Summary

A talk to outline the implementation of the EW Sudakov high-energy approximation to NLO EW calculations in the SHERPA Monte Carlo event generator.

Primary author

Dr Jennifer Thompson (II. Physikalisches Institut, Georg-August-Universitaet Goettingen)

Presentation materials