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Reducing negative weights in Monte Carlo event generation with Sherpa

by Katharina Danziger, Stefan Höche, Frank Siegert

Submission summary

As Contributors: Frank Siegert
Arxiv Link: (pdf)
Date submitted: 2021-11-05 11:31
Submitted by: Siegert, Frank
Submitted to: SciPost Physics
Academic field: Physics
  • High-Energy Physics - Experiment
  • High-Energy Physics - Phenomenology
Approaches: Computational, Phenomenological


An increase in theoretical precision of Monte Carlo event generators is typically accompanied by an increased need for computational resources. One major obstacle are negative weighted events, which appear in Monte Carlo simulations with higher perturbative accuracy. While they can be handled somewhat easily in fixed-order calculations, they are a major concern for particle level event simulations. In this article, the origin of negative weights in the S-MC@NLO method is reviewed and mechanisms to reduce the negative weight fraction in simulations with the Sherpa event generator are presented, with a focus on V+jets and tt+jets simulations.

Current status:
Editor-in-charge assigned

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Submission 2110.15211v1 on 5 November 2021

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