Model Independent Framework for Searches of Top Partners

Abstract

We propose a model-independent and general framework to study the LHC phenomenology of top partners, i.e. Vector-Like quarks including particles with different electro-magnetic charge. We consider Vector-Like quarks embedded in general representations of the weak SU(2)L, coupling to all Standard Model quarks via Yukawa mixing focusing on the case of a single multiplet. We show that, with very minimal and quite general assumptions, top partners may be studied in terms of few parameters in an effective Lagrangian description with a clear and simple connection with experimental observables. We also demonstrate that the parametrisation can be applied as well to cases with many Vector-like multiplets, thus covering most realistic models of New Physics. We perform a numerical study to understand the conclusions which can be drawn within such a description and the expected potential for discovery or exclusion at the LHC. Our main results are a clear connection between branching ratios and single production channels, and the identification of novel interesting channels to be studied at the LHC.

42 pages, 2 figures, 20 tables, added an appendix with a discussion of coupling chirality in general scenarios; added a comparison of collider and flavour bounds; added details about the range of validity of the framework. References added

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Cited by in corpus (137)

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• Di-Higgs production as a probe of flavor changing neutral Yukawa couplings
• Search for pair-produced vector-like quarks coupling to light quarks in the lepton plus jets final state using 13 TeV $pp$ collisions with the ATLAS detector
• Exploring vector-like $B$-quark pair production at CLIC in fully hadronic final states
• Interplay of vector-like top partner multiplets in a realistic mixing set-up
• Search for single-production of vector-like quarks decaying into $Wb$ in the fully hadronic final state in $pp$ collisions at $\sqrt{s}=13$ TeV with the ATLAS detector
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• Impact of hidden heavy Higgs channels of VLB-Quarks below 1 TeV in 2HDM
• Vector-like quarks decaying into singly and doubly charged bosons at LHC
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