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Search for top squarks in events with a Higgs or Z boson using 139 fb-1 of pp collision data at √s=13 TeV with the ATLAS detector: European Physical Journal C

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Article number1080
<mark>Journal publication date</mark>23/11/2020
<mark>Journal</mark>Eur. Phys. J. C
Issue number11
Number of pages33
Publication StatusPublished
<mark>Original language</mark>English


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 √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 (t~1) or the heavier top squark (t~2), excluding at 95% confidence level t~1 and t~2 masses up to about 1220 and 875 GeV, respectively.