MCNET-16-22
ZU-TH-21-16
ZU--TH--21-16
arXiv:1606.08753
Eur.Phys.J. C76 (2016) 590

by: Bothmann, Enrico (Gottingen U., II. Phys. Inst.) et al.

Abstract:
We present the implementation and validation of the techniques used to efficiently evaluate parametric and perturbative theoretical uncertainties in matrix-element plus parton-shower simulations within the Sherpa event-generator framework. By tracing the full $\alpha_s$ and PDF dependences, including the parton-shower component, as well as the fixed-order scale uncertainties, we compute variational event weights on-the-fly, thereby greatly reducing the computational costs to obtain theoretical-uncertainty estimates.