Abstract
This paper presents a search for direct top squark pair production in events with missing transverse momentum plus either a pair of jets consistent with Standard Model Higgs boson decay into b-quarks or a same-flavour opposite-sign dilepton pair with an invariant mass consistent with a Z boson. The analysis is performed using the proton–proton collision data at sqrt{s}=13 TeV collected with the ATLAS detector during the LHC Run-2, corresponding to an integrated luminosity of 139 fb^{-1}. No excess is observed in the data above the Standard Model predictions. The results are interpreted in simplified models featuring direct production of pairs of either the lighter top squark (tilde{t}_1) or the heavier top squark (tilde{t}_2), excluding at 95% confidence level tilde{t}_1 and tilde{t}_2 masses up to about 1220 and 875 GeV, respectively.
Highlights
Supersymmetry (SUSY) [1,2,3,4,5,6] is one of the most studied frameworks to extend the Standard Model (SM) beyond the electroweak scale
This paper presents the results of a s√earch for top squarks in final states with Higgs or Z bosons at s = 13 TeV using the complete data sample collected with the ATLAS detector [19]
Each source of uncertainty is described by a single nuisance parameter, and correlations between background processes and selections are taken into account
Summary
Supersymmetry (SUSY) [1,2,3,4,5,6] is one of the most studied frameworks to extend the Standard Model (SM) beyond the electroweak scale. Simplified models [16,17,18] are used for the analysis optimisation and interpretation of the results In these models, direct top squark pair production is considered and all SUSY particles are decoupled except for the top squarks and the neutralinos involved in their decay. Simplified models featuring direct t1 production with t1 → tχ and decays via either Higgs (χ20 → hχ10) or Z (χ20 → Z χ10) bosons with different branching ratio values are considered. In these models, the χ10 is assumed to be very light and the χ20 −χ10 mass difference to be large enough to allow on-shell Higgs or Z boson decays.
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