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


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Abstract

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 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.

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Keywords
Regular Article – Experimental Physics
Journal Title
The European Physical Journal C
Conference Name
Journal ISSN
1434-6044
1434-6052
Volume Title
80
Publisher
Springer Berlin Heidelberg