Search for standard model production of four top quarks with same-sign and multilepton final states in proton-proton collisions at $\sqrt{s}=$ 13 TeV

Abstract

A search for standard model production of four top quarks ($\mathrm{t}\overline{\mathrm{t}}\mathrm{t}\overline{\mathrm{t}})$ is reported using events containing at least three leptons (e, $\mu$) or a same-sign lepton pair. The events are produced in proton-proton collisions at a center-of-mass energy of 13 TeV at the LHC, and the data sample, recorded in 2016, corresponds to an integrated luminosity of 35.9 fb${}^{-1}$. Jet multiplicity and flavor are used to enhance signal sensitivity, and dedicated control regions are used to constrain the dominant backgrounds. The observed and expected signal significances are, respectively, 1.6 and 1.0 standard deviations, and the $\mathrm{t}\overline{\mathrm{t}}\mathrm{t}\overline{\mathrm{t}}$ cross section is measured to be 16.9 ${}_{-11.4}^{+13.8}$ fb, in agreement with next-to-leading-order standard model predictions. These results are also used to constrain the Yukawa coupling between the top quark and the Higgs boson to be less than 2.1 times its expected standard model value at 95% confidence level.

arXiv commentReplaced with the published version. Added the journal reference and DOI. All the figures and tables, including additional supplementary figures and material, can be found at cms-results.web.cern.ch/cms-results/public-results/publications/TOP-17-009/ (CMS Public Pages)

References in corpus (35)

• 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
• A Brief Introduction to PYTHIA 8.1
• FastJet user manual
• Asymptotic formulae for likelihood-based tests of new physics
• Parton distributions for the LHC Run II
• Confidence Level Computation for Combining Searches with Small Statistics
• 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
• The CMS trigger system
• Merging meets matching in MC@NLO
• Precise determination of the mass of the Higgs boson and tests of compatibility of its couplings with the standard model predictions using proton collisions at 7 and 8 TeV
• Determination of Jet Energy Calibration and Transverse Momentum Resolution in CMS
• Performance of CMS muon reconstruction in pp collision events at sqrt(s) = 7 TeV
• Jet energy scale and resolution in the CMS experiment in pp collisions at 8 TeV
• Performance of electron reconstruction and selection with the CMS detector in proton-proton collisions at sqrt(s) = 8 TeV
• The PDF4LHC Working Group Interim Recommendations
• W+W-, WZ and ZZ production in the POWHEG BOX
• The PDF4LHC Working Group Interim Report
• W+W-, WZ and ZZ production in the POWHEG BOX V2
• Seeking Sgluons
• Search for production of vector-like quark pairs and of four top quarks in the lepton-plus-jets final state in $pp$ collisions at $\sqrt{s}=8$ TeV with the ATLAS detector
• 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 $\sqrt{s}=$ 13 TeV
• Constraining BSM Physics at the LHC: Four top final states with NLO accuracy in perturbative QCD
• Search for new physics in same-sign dilepton events in proton-proton collisions at sqrt(s) = 13 TeV
• Analysis of events with $b$-jets and a pair of leptons of the same charge in $pp$ collisions at $\sqrt{s}=8$ 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
• Searching for sgluons in multitop events at a center-of-mass energy of 8 TeV
• Probing Higgs Width and Top Quark Yukawa Coupling from $t\bar{t}H$ and $t\bar{t}t\bar{t}$ Productions
• Measurements of tt-bar cross sections in association with b jets and inclusive jets and their ratio using dilepton final states in pp collisions at sqrt(s) = 13 TeV
• Search for standard model production of four top quarks in the lepton + jets channel in pp collisions at sqrt(s) = 8 TeV
• Heavy Higgs Bosons at Low $\tan \beta$: from the LHC to 100 TeV
• Measurement of electroweak production of a W boson in association with two jets in proton-proton collisions at $\sqrt{s}=$ 13 TeV
• Search for standard model production of four top quarks in proton-proton collisions at sqrt(s) = 13 TeV

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• Indirect $\mathcal{C}\mathcal{P}$ probes of the Higgs-top-quark interaction: current LHC constraints and future opportunities
• Search for four-top-quark production in the single-lepton and opposite-sign dilepton final states in pp collisions at $\sqrt{s}$ = 13 TeV with the ATLAS detector
• Observation of four top quark production in proton-proton collisions at $\sqrt{s}$ = 13 TeV
• Constraining a Lighter Exotic Scalar via Same-sign Top
• Constraining $t\to u$ flavor changing neutral Higgs coupling at the LHC
• Implications of Four-Top and Top-Pair Studies on Triple-Top Production
• Constraining top quark flavor violation and dipole moments through three and four top quark productions at the LHC
• Combined SMEFT interpretation of Higgs, diboson, and top quark data from the LHC
• Top-Assisted Di-Higgs boson Production Motivated by Baryogenesis
• Exploring the global symmetry structure of the Higgs potential via same-sign pair production of charged Higgs bosons
• Effective field theory and scalar extensions of the top quark sector
• Dispelling the $\sqrt{L}$ myth for the High-Luminosity LHC
• LHC Dark Matter Working Group: Next-generation spin-0 dark matter models
• Measurement of the top quark Yukawa coupling from $\mathrm{t}\bar{\mathrm{t}}$ kinematic distributions in the lepton+jets final state in proton-proton collisions at $\sqrt{s}=$ 13 TeV
• Evidence for four-top quark production in proton-proton collisions at $\sqrt{s}$ = 13 TeV
• Stairway to discovery: a report on the CMS programme of cross section measurements from millibarns to femtobarns
• What can We Learn from Triple Top-Quark Production?
• Probing Top-philic New Physics via Four-Top-Quark Production
• $t\bar{t}t\bar{t}$ signatures through the lens of color-octet scalars
• Composite Higgs Models with a Hidden Sector
• Non-Leptonic Decays of Bileptons
• Boosting Beyond: A Novel Approach to Probing Top-Philic Resonances at the LHC
• Results on TOP physics from CMS
• Anatomy of the $tthh$ Physics at HL-LHC
• Hadroproduction of four top quarks in the POWHEG BOX
• TOP2017: Experimental Summary
• Searches for new interactions within the SMEFT framework at present and future colliders