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arxiv: 1606.08753 · v3 · pith:6DVALKEMnew · submitted 2016-06-28 · ✦ hep-ph · hep-ex

Reweighting QCD matrix-element and parton-shower calculations

classification ✦ hep-ph hep-ex
keywords parton-showermatrix-elementuncertaintiesalphacalculationscomponentcomputationalcompute
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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.

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