Top-antitop pair hadroproduction in association with a heavy boson at the NLO QCD accuracy + Parton Shower

TL;DR

This paper presents NLO QCD predictions for top-antitop pair production with a heavy boson, incorporating parton shower effects, and compares results with CMS experimental cuts.

Contribution

It introduces an integrated framework combining POWHEG-BOX and HELAC-NLO for accurate predictions of top-antitop-V production at NLO QCD with parton shower matching.

Findings

Predictions for top-antitop-W and Z production at NLO QCD.

Comparison with CMS experimental cut system.

Phenomenological analysis at hadron and parton levels.

Abstract

The PowHel framework allows to make predictions of total and differential cross-sections of multiparticle hadroproduction processes at both NLO QCD accuracy and NLO QCD matched to Parton Shower, on the basis of the interface between the POWHEG-BOX and HELAC-NLO codes. It has already been applied to study several processes involving a top-antitop pair in association with a third particle or hadronic jet. Our most recent predictions concern top-antitop-V hadroproduction (with V = W or Z), at both parton and hadron level, by considering different decay channels (hadronic and leptonic) of the heavy particles. In particular, we show the results of our phenomenological analyses under the same system of cuts also recently adopted by the CMS collaboration at LHC.