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

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arxiv 2108.07826 v1 pith:ZVY4APK3 submitted 2021-08-17 hep-ph hep-ex

Rikkert Frederix , Ioannis Tsinikos This is my paper · ORCID
classification hep-phhep-ex
keywords differentialdistributionsincludingjetsmergingpredictionsproductionaccount
verification ladder T0 review T1 audit T2 compute T3 formal
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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.

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Cited by 4 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Two-loop QCD amplitudes for $t\bar{t}W$ production at the LHC in the leading-colour approximation

    hep-ph 2026-08 conditional novelty 7.0 of 10

    First two-loop QCD hard functions for ttW production with exact top and W masses in leading colour, evaluated on a 224,640-point grid and cross-checked by an independent calculation.

  2. A search for electroweak $t\bar{t}Wj$ production in multileptonic final states at $\sqrt{s} = 13$ TeV with the ATLAS detector and bounds on effective field theory operators

    hep-ex 2025-09 accept novelty 7.0 of 10

    First search for electroweak ttWj production at 13 TeV sets observed (expected) 95% CL upper limits of 251 fb (230 fb) versus the SM prediction of 47.7 fb and constrains the O_Ht and O_HQ^(1) EFT operators.

  3. Multi-scale improved predictions for $\boldsymbol{pp \to t\bar{t}W^+ +X}$

    hep-ph 2026-07 accept novelty 5.5 of 10

    MiNLO yields NLO predictions for full off-shell pp o ttW+(j/jj) that agree with fixed-order results while reducing scale dependence for multi-jet samples, and merging improves the inclusive ttW+ description.

  4. Measurement of the Higgs boson production in association with top quarks in multilepton final states in $pp$ collisions at $\sqrt{s}=13$ TeV with the ATLAS detector

    hep-ex 2025-10 conditional novelty 5.0 of 10

    ATLAS measures the ttH cross-section at 0.63+0.20−0.19 of the Standard Model prediction (3.3σ observed, 5.3σ expected) and excludes top-Higgs CP-mixing angles |α|>62° at 68% confidence.

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