An NLO+PS generator for $t\bar{t}$ and $Wt$ production and decay including non-resonant and interference effects

Abstract

We present a Monte Carlo generator that implements significant theoretical improvements in the simulation of top-quark pair production and decay at the LHC. Spin correlations and off-shell effects in top-decay chains are described in terms of exact matrix elements for $pp\to {\ell }^{+}{\nu }_{\ell }{l}^{-}{\bar{\nu }}_{l}b\bar{b}$ at NLO QCD, where the leptons $\ell$ and $l$ belong to different families, and $b$ quarks are massive. Thus, the contributions from $t\bar{t}$ and $Wt$ single-top production as well as their quantum interference are fully included. Matrix elements are matched to the Pythia8 parton shower using a recently proposed method that allows for a consistent treatment of resonances in the POWHEG framework. These theoretical improvements are especially important for the interpretation of precision measurements of the top-quark mass, for single-top analyses in the $Wt$ channel, and for $t\bar{t}$ and $Wt$ backgrounds in the presence of jet vetoes or cuts that enhance off-shell effects. The new generator is based on a process-independent interface of the OpenLoops amplitude generator with the POWHEGBOX framework.

49 pages, 22 figures

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Cited by in corpus (15)

• NLO electroweak corrections to off-shell top-antitop production with leptonic decays at the LHC
• What is the Top Quark Mass?
• NLO QCD+EW predictions for HV and HV+jet production including parton-shower effects
• Top-pair production at the LHC with MiNNLO${}_{\mathrm{PS}}$
• Measurement of lepton differential distributions and the top quark mass in $t\bar{t}$ production in $pp$ collisions at $\sqrt{s}=8$ TeV with the ATLAS detector
• NLO QCD+NLO EW corrections to diboson production matched to parton shower
• Top-quark pair-production and decay at high precision
• $W^{\pm }Z$ production at NNLO QCD and NLO EW matched to parton showers with MiNNLO${}_{\mathrm{PS}}$
• Momentum-space threshold resummation in $tW$ production at the LHC
• Extracting the Top-Quark Width from Non-Resonant Production
• Scalar production and decay to top quarks including interference effects at NLO in QCD in an EFT approach
• Energy peaks: a high energy physics outlook
• Top-mass observables: all-orders behaviour, renormalons and NLO + Parton Shower effects
• Precise predictions for electroweak $t\bar{t}$ production at the LHC in models with flavour non-diagonal $Z^{\prime }$ boson couplings and $W^{\prime }$ bosons
• Top quark modelling in POWHEG BOX