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Four Tops for LHC
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abstract
We design a search strategy for the Standard Model $t\bar t t \bar t$ production at the LHC in the same-sign dilepton and trilepton channels. We study different signal features and, given the small expected number of signal events, we scrutinize in detail all reducible and irreducible backgrounds. Our analysis shows that by imposing a set of basic jet and lepton selection criteria, the SM $pp \to t\bar t t \bar t$ process could be evidenced in the near future, within Run-II, when combining both multi-lepton search channels. We argue that this search strategy should also be used as a guideline to test New Physics coupling predominantly to top-quarks. In particular, we show that a non-resonant New Physics enhancement in the four-top final state would be detectable through this search strategy. We study two {\it top-philic} simplified models of this kind, a neutral scalar boson and a $Z^\prime$, and present current and future exclusion limits on their mass and couplings.
Forward citations
Cited by 4 Pith papers
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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.
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KK Higgs produced in association with a top quark pair in the bulk RS Model
Using boosted top tagging in a four-top final state, the first Kaluza-Klein Higgs excitation in the deformed Randall-Sundrum model could be probed up to about 1.2 TeV at the high-luminosity LHC, at the 3-sigma level.
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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
CMS measures the four-top-quark production cross section to be 12.6 +5.8 -5.2 fb with an observed significance of 2.6 standard deviations, consistent with the standard model prediction of 12.0 fb.
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Harnessing Higgs Kinematics for HEFT Constraints
Reweighting Standard Model di-Higgs events with a momentum-dependent HEFT coupling gives expected Run 3 and HL-LHC constraints on a_22 and a_dd2, with four-top data helping to pin down a_22.
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