REVIEW 11 cited by
Observation of four-top-quark production in the multilepton final state with the ATLAS detector
Not yet reviewed by Pith; the record is open.
This paper has not been read by Pith yet. Machine review is queued; the pith claim, tier, and objections will appear here once it completes.
SPECIMEN: schema-true, not a live event
T0 review · schema-true
One-sentence machine reading of the paper's core claim.
pith:XXXXXXXX · record.json · timestamp
Signed reviews
abstract
This paper presents the observation of four-top-quark ($t\bar{t}t\bar{t}$) production in proton-proton collisions at the LHC. The analysis is performed using an integrated luminosity of 140 fb$^{-1}$ at a centre-of-mass energy of 13 TeV collected using the ATLAS detector. Events containing two leptons with the same electric charge or at least three leptons (electrons or muons) are selected. Event kinematics are used to separate signal from background through a multivariate discriminant, and dedicated control regions are used to constrain the dominant backgrounds. The observed (expected) significance of the measured $t\bar{t}t\bar{t}$ signal with respect to the standard model (SM) background-only hypothesis is 6.1 (4.3) standard deviations. The $t\bar{t}t\bar{t}$ production cross section is measured to be $22.5^{+6.6}_{-5.5}$ fb, consistent with the SM prediction of $12.0 \pm 2.4$ fb within 1.8 standard deviations. Data are also used to set limits on the three-top-quark production cross section, being an irreducible background not measured previously, and to constrain the top-Higgs Yukawa coupling and effective field theory operator coefficients that affect $t\bar{t}t\bar{t}$ production.
Forward citations
Cited by 11 Pith papers
-
Benchmarking Machine Learning Architectures for ttH Multilepton Signal Sensitivity
A controlled benchmark of six ML classifiers on a new simulated ttH multilepton dataset finds symmetry-constrained graph models (Particle Transformer, LorentzNet) and azimuthal RoPE encoding outperform tabular baselines.
-
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
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.
-
Search for a resonance in events with four top quarks decaying into two leptons and jets in proton-proton collisions
No significant excess is observed in a search for top-philic resonances in four-top-quark events with two leptons, and 95% confidence-level upper limits are set for mediator masses from 500 GeV to 4 TeV.
-
Electroweak precision observables at NLL order in the SMEFT
SMEFT electroweak precision predictions can be upgraded to NLL accuracy using two-loop renormalization-group evolution plus one-loop matching, yielding complete 210-coefficient expressions and stronger indirect new-ph...
-
Search for a top-philic Z' boson decaying into a $\mathrm{t\bar{t}}$ pair in a final state with jets and an electron or muon in proton-proton collisions at $\sqrt{s}$ = 13.6 TeV
CMS sees no evidence for a top-philic Z' boson decaying to top-quark pairs and sets the tightest published cross-section limits for masses between 0.5 and 3 TeV.
-
Phenomenology of a Kinetic Higgs Portal
A momentum-dependent Higgs portal can hide invisible decays, make four-top production the most sensitive probe, and open a dark-matter region immune to direct detection.
-
Precision tests of third-generation four-quark operators: $gg \to h$ and $h \to \gamma \gamma$
Two-loop SMEFT corrections from third-generation four-quark operators to gg to h and h to gamma gamma are computed with full mass dependence, including new two-loop anomalous dimensions.
-
Invariant-mass threshold resummation for the production of four top quarks at the LHC
First invariant-mass threshold resummation for ttbar ttbar production, giving NLO+NLL' predictions for the invariant-mass distribution and total cross section.
-
Pretrained Event Classification Model for High Energy Physics Analysis
A pretrained GNN on 120M simulated LHC events improves downstream event-classification accuracy when training data are scarce, with benefits shrinking as data grow.
-
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
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.
-
Fingerprinting New Physics with Effective Field Theories
A thesis compiling published SMEFT global fits, automated UV-model constraints, and ML-based unbinned observables, with projections for HL-LHC, FCC-ee, and CEPC.
Discussion (0). Continue with ORCID to comment.