Evidence for four-top quark production in proton-proton collisions at = 13 TeV
arXiv:2303.03864 · doi:10.1016/j.physletb.2023.138076
Abstract
The production of four top quarks () is studied with LHC proton-proton collision data samples collected by the CMS experiment at a center-of-mass energy of 13 TeV, and corresponding to integrated luminosities of up to 138 fb. Events that have no leptons (all-hadronic), one lepton, or two opposite-sign leptons (where lepton refers only to prompt electrons or prompt muons) are considered. This is the first measurement that includes the all-hadronic final state. The observed significance of the signal in these final states of 3.9 standard deviations (1.5 expected) provides evidence for production, with a measured cross section of 36 fb. Combined with earlier CMS results in other final states, the signal significance is 4.0 standard deviations (3.2 expected). The combination returns an observed cross section of 17 4 (stat) 3 (syst) fb, which is consistent with the standard model prediction.
arXiv commentReplaced with the published version. Added the journal reference and the DOI. All the figures and tables, including additional supplementary figures and tables, can be found at http://cms-results.web.cern.ch/cms-results/public-results/publications/TOP-21-005 (CMS Public Pages)
References in corpus (31)
- 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
- FastJet user manual
- Asymptotic formulae for likelihood-based tests of new physics
- 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
- Parton distributions for the LHC Run II
- A Supersymmetry Primer
- Confidence Level Computation for Combining Searches with Small Statistics
- Parton distributions from high-precision collider data
- Comparative study of various algorithms for the merging of parton showers and matrix elements in hadronic collisions
- Particle-flow reconstruction and global event description with the CMS detector
- Event generator tunes obtained from underlying event and multiparton scattering measurements
- Jet energy scale and resolution in the CMS experiment in pp collisions at 8 TeV
- Identification of heavy-flavour jets with the CMS detector in pp collisions at 13 TeV
- Extraction and validation of a new set of CMS PYTHIA8 tunes from underlying-event measurements
- Pileup Per Particle Identification
- Precision luminosity measurement in proton-proton collisions at 13 TeV in 2015 and 2016 at CMS
- The automation of next-to-leading order electroweak calculations
- Electron and photon reconstruction and identification with the CMS experiment at the CERN LHC
- Jet Flavour Classification Using DeepJet
- Higgs Decay to Top Quarks at Hadron Colliders
- Search for production of four top quarks in final states with same-sign or multiple leptons in proton-proton collisions at 13 TeV
- Composite scalars at the LHC: the Higgs, the Sextet and the Octet
- A Dark Matter candidate from Lorentz Invariance in 6 Dimensions
- Evidence for production in the multilepton final state in proton-proton collisions at =13 TeV with the ATLAS detector
- Search for physics beyond the standard model in events with two leptons of same sign, missing transverse momentum, and jets in proton-proton collisions at sqrt(s) = 13 TeV
- Search for direct top squark pair production in events with one lepton, jets, and missing transverse momentum at 13 TeV with the CMS experiment
- Search for standard model production of four top quarks with same-sign and multilepton final states in proton-proton collisions at 13 TeV
- LHC signatures of a Z' mediator between dark matter and the SU(3) sector
Cited by in corpus (5)
- Dispelling the myth for the High-Luminosity LHC
- Search for top-philic heavy resonances in collisions at TeV with the ATLAS detector
- Prospects for sub-EW-scale ALP searches via signatures at the LHC using jet substructure techniques
- TOP2024: an overview of experimental results
- Machine learning in top quark physics at ATLAS and CMS