Münster 2017 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 51: Top Quark 3 (Produktion)

T 51.6: Vortrag

Dienstag, 28. März 2017, 18:00–18:15, JUR 4

Validation of Madgraph5_aMC@NLO with Herwig7 using the FxFx scheme in top physics for ATLAS — •Krishna Kulkarni — O2.314, Building 1c, ATLAS Group, DESY, Notkestraße 85, 22607 Hamburg

For top physics, ATLAS commonly used MC events produced using NLO matrix element generation matched with QCD radiation simulated with parton shower codes. However, the description is sub-optimal for hard or wide angle QCD radiation. Including hard QCD radiation in the matrix element calculation improves the predictions and reduces theoretical uncertainties. Multi-leg matrix element generators calculating hard QCD radiation already exist. But their predictions need to be merged with the NLO matrix element generation.

FxFx is one of the schemes for this merging. The main goal of this analysis is to check the FxFx predictions on recently measured observables sensitive to additional QCD radiation in top pair production, where the matrix element is calculated by Madgraph5_aMC@NLO and the showering is performed with Herwig7 using the FxFx scheme for top physics. The events were simulated using the newly developed ATLAS interface at 13 TeV.