Constraining $qqtt$ operators from four-top production: a case for enhanced EFT sensitivity

Abstract

Recently, experimental collaborations have reported $\mathcal{O}(10)$ upper limits on the signal strength of four-top production at the LHC. Surprisingly, we find that the constraining power of four-top production on the $qqtt$ type of operators is already competitive with the measurements of top-pair production, even though the precision level of the latter is more than two orders of magnitude better. This is explained by the enhanced sensitivity of the four-top cross section to $qqtt$ operators, due to multiple insertion of operators in the squared amplitude, and to the large threshold energy of four-top production. We point out that even though the dominant contribution beyond the standard model comes from the $\mathcal{O}(C^4/{\Lambda }^8)$ terms, the effective field theory expansion remains valid for a wide range of underlying theories. Considering the possible improvements of this measurement with higher integrated luminosity, we believe that this process will become even more crucial for probing and testing the standard model deviations in the top-quark sector, and will eventually provide valuable information about the top-quark properties, leading to significant improvements in precision top physics.

16 pages, 9 figures, refs updated; accepted version

References in corpus (13)

• The automated computation of tree-level and next-to-leading order differential cross sections, and their matching to parton shower simulations
• Parton distributions in the LHC era: MMHT 2014 PDFs
• Effective-Field-Theory Approach to Top-Quark Production and Decay
• Vices and Virtues of Higgs EFTs at Large Energy
• Anomalous Triple Gauge Couplings in the Effective Field Theory Approach at the LHC
• Top Compositeness at the Tevatron and LHC
• Constraining BSM Physics at the LHC: Four top final states with NLO accuracy in perturbative QCD
• Manifestations of Top Compositeness at Colliders
• Four Tops for LHC
• LHC multijet events as a probe for anomalous dimension-six gluon interactions
• Measurement of top quark pair differential cross-sections in the dilepton channel in $pp$ collisions at $\sqrt{s}$ = 7 and 8 TeV with ATLAS
• Probing top-philic sgluons with LHC Run I data
• Search for standard model production of four top quarks in proton-proton collisions at sqrt(s) = 13 TeV

Cited by in corpus (30)

• The Standard Model as an Effective Field Theory
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• Observation of four-top-quark production in the multilepton final state with the ATLAS detector
• Global and optimal probes for the top-quark effective field theory at future lepton colliders
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• Complete SMEFT predictions for four top quark production at hadron colliders
• Observation of four top quark production in proton-proton collisions at $\sqrt{s}$ = 13 TeV
• Learning to pinpoint effective operators at the LHC: a study of the $t\bar{t}b\bar{b}$ signature
• Constraining top quark flavor violation and dipole moments through three and four top quark productions at the LHC
• Effective field theory and scalar extensions of the top quark sector
• Colorful Imprints of Heavy States in the Electroweak Effective Theory
• New Physics from High Energy Tops
• Four-top as probe of light top-philic New Physics
• On the BSM reach of four top production at the LHC
• What can We Learn from Triple Top-Quark Production?
• Measuring the top energy asymmetry at the LHC: QCD and SMEFT interpretations
• Probing Top-philic New Physics via Four-Top-Quark Production
• Top FCNC interactions through dimension six four-fermion operators at the electron proton collider
• Four top final states with NLO accuracy in perturbative QCD: 4 lepton channel
• Topic Model for four-top at the LHC
• Climbing to the Top of the ATLAS 13 TeV data
• Collider-Flavour Complementarity from the bottom to the top
• Four top final states with NLO accuracy in perturbative QCD: 3 lepton channel
• Signs of new physics in top quark pair production associated with a neutrino pair at the LHC
• Hadroproduction of four top quarks in the POWHEG BOX
• Flavorful Electroweak Precision Observables in the Standard Model Effective Field Theory