Hamburg 2016 – scientific programme
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T: Fachverband Teilchenphysik
T 55: Monte Carlo, Partonschauer, QCD (Theorie)
T 55.4: Talk
Tuesday, March 1, 2016, 17:30–17:45, VMP8 SR 105
Fast evaluation of theoretical uncertainties with Sherpa and MCgrid — •Enrico Bothmann1, Marek Schönherr2, and Steffen Schumann1 — 1II. Physikalisches Institut, Georg-August-Universität Göttingen — 2Physik-Institut, Universität Zürich
The determination of theoretical error estimates and PDF/αs-fits requires fast evaluations of cross sections for varied QCD input parameters. These include PDFs, the strong coupling constant αS and the renormalization and factorization scales. Beyond leading order QCD, a full dedicated calculation for each set of parameters is often too time-consuming, certainly when performing PDF-fits. In this talk we discuss two methods to overcome this issue for any QCD NLO calculation: The novel event-reweighting feature in Sherpa and the automated generation of interpolations grids using the recently introduced MCgrid interface. For the Sherpa event-reweighting we present the newly added support for the all-order PDF dependencies of parton shower emissions. Building on that we discuss the sensitivity of high precision observables to those dependencies.