On improving NLO merging for $t\bar{t}W$ production

Abstract

We introduce an improvement to the FxFx matrix element merging procedure for $pp\to t\bar{t}W$ production at NLO in QCD with one and/or two additional jets. The main modification is an improved treatment of jets that are not logarithmically enhanced in the low transverse-momentum regime. We provide predictions for the inclusive cross section and the $t\bar{t}W$ differential distributions including parton-shower effects. Taking also the NLO EW corrections into account, this results in the most-accurate predictions for this process to date. We further proceed to include the on-shell LO decays of the $t\bar{t}W$ including the tree-level spin correlations within the narrow-width approximation, focusing on the multi-lepton signatures studied at the LHC. We find a $\sim 30\%$ increase over the NLO QCD prediction and large non-flat $K$-factors to differential distributions.

arXiv comment21 pages, 8 figures, 4 tables

References in corpus (26)

• The automated computation of tree-level and next-to-leading order differential cross sections, and their matching to parton shower simulations
• The anti-k_t jet clustering algorithm
• An Introduction to PYTHIA 8.2
• A general framework for implementing NLO calculations in shower Monte Carlo programs: the POWHEG BOX
• A New Method for Combining NLO QCD with Shower Monte Carlo Algorithms
• Event generation with SHERPA 1.1
• Matching NLO QCD computations and parton shower simulations
• Parton distributions from high-precision collider data
• Event Generation with Sherpa 2.2
• Merging meets matching in MC@NLO
• Automatic spin-entangled decays of heavy resonances in Monte Carlo simulations
• Matching NLO QCD and parton showers in heavy flavour production
• The automation of next-to-leading order electroweak calculations
• MINLO: Multi-scale improved NLO
• Merging H/W/Z + 0 and 1 jet at NLO with no merging scale: a path to parton shower + NNLO matching
• Large NLO corrections in $t\bar{t}{W}^{\pm }$ and $t\bar{t}t\bar{t}$ hadroproduction from supposedly subleading EW contributions
• Associated production of a top-quark pair with vector bosons at NLO in QCD: impact on $t\bar{t}H$ searches at the LHC
• Top-quark pair hadroproduction in association with a heavy boson at NLO+NNLL including EW corrections
• Strong tW Scattering at the LHC
• Top-quark charge asymmetry and polarization in $t\bar{t}{W}^{\pm }$ production at the LHC
• Associated top quark pair production with a heavy boson: differential cross sections at NLO+NNLL accuracy
• Anatomy of inclusive $t\overline{t}W$ production at hadron colliders
• Top-quark pair production in association with a $W^{\pm }$ gauge boson in the POWHEG-BOX
• The simplest of them all: $t\bar{t}{W}^{\pm }$ at NLO accuracy in QCD
• Combined NLO EW and QCD corrections to off-shell $\text{t}\overline{\text{t}}\text{W}$ production at the LHC
• NLO QCD corrections to off-shell $\text{t}\bar{\text{t}}{\text{W}}^{+}$ production at the LHC

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