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

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...

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Main Authors: Aad, Georges (Author) , Andrei, George Victor (Author) , Bartels, Falk (Author) , Bolz, Arthur (Author) , Czurylo, Marta (Author) , Dittmeier, Sebastian (Author) , Dunford, Monica (Author) , Ferreira de Lima, Danilo Enoque (Author) , Franchino, Silvia (Author) , Jongmanns, Jan (Author) , Klassen, Martin (Author) , Krishnan, Anjali (Author) , Mkrtchyan, Tigran (Author) , Napolitano, Fabrizio (Author) , Ott, Philipp (Author) , Schöning, André (Author) , Schultz-Coulon, Hans-Christian (Author) , Spieker, Thomas (Author) , Stamen, Rainer (Author) , Starovoitov, Pavel (Author) , Vigani, Luigi (Author) , Weber, Sebastian (Author) , Wessels, Martin (Author) , Yue, Xiaoguang (Author)
Corporate Author: ATLAS Collaboration (Author)
Format: Article (Journal)
Language:English
Published: 23 November 2020
In: The European physical journal. C, Particles and fields
Year: 2020, Volume: 80, Issue: 11, Pages: 1-33
ISSN:1434-6052
DOI:10.1140/epjc/s10052-020-08469-8
Online Access:Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1140/epjc/s10052-020-08469-8
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Author Notes:ATLAS Collaboration
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Summary: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 $$\sqrt{s}=13$$s=13TeV collected with the ATLAS detector during the LHC Run-2, corresponding to an integrated luminosity of 139 fb$$^{-1}$$-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 ($$\tilde{t}_1$$t~1) or the heavier top squark ($$\tilde{t}_2$$t~2), excluding at 95% confidence level $$\tilde{t}_1$$t~1and $$\tilde{t}_2$$t~2masses up to about 1220 and 875 GeV, respectively.
Item Description:ATLAS Collaboration: G. Aad, V. Andrei, F. Bartels, A.E. Bolz, M.M. Czurylo, S.J. Dittmeier, M. Dunford, D.E. Ferreira de Lima, S. Franchino, J. Jongmanns, M. Klassen, A. Krishnan, T. Mkrtchyan, F. Napolitano, P.S. Ott, A. Schoening, H.-C. Schultz-Coulon, T.M. Spieker, R. Stamen, P. Starovoitov, L. Vigani, S.M. Weber, M. Wessels, X.Yue [und viele weitere]
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Physical Description:Online Resource
ISSN:1434-6052
DOI:10.1140/epjc/s10052-020-08469-8

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