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Search for a scalar partner of the top quark in the all-hadronic tt[bar] plus missing transverse momentum final state at √s=13 TeV with the ATLAS detector

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A search for direct pair production of scalar partners of the top quark (top squarks or scalar third-generation up-type leptoquarks) in the all-hadronic $$t{\bar{t}}$$ plus missing transverse momentum final state is presented. The analysis of 139 $$\hbox {fb}^{-1}$$ of $${\sqrt{s}=13}$$ TeV proton-p...

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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) , Helary, Louis (Author) , Jongmanns, Jan (Author) , Klassen, Martin (Author) , Krishnan, Anjali (Author) , Kugel, Andreas (Author) , Mkrtchyan, Tigran (Author) , Napolitano, Fabrizio (Author) , Ott, Philipp (Author) , S̜ahinsoy, Merve (Author) , Schöning, André (Author) , Schultz-Coulon, Hans-Christian (Author) , Spieker, Thomas (Author) , Stamen, Rainer (Author) , Starovoitov, Pavel (Author) , Suchek, Stanislav (Author) , Vigani, Luigi (Author) , Weber, Sebastian (Author) , Wessels, Martin (Author) , Yue, Xiaoguang (Author)
Corporate Author: ATLAS Collaboration (Author)
Format: Article (Journal)
Language:English
Published: 13 August 2020
In: The European physical journal. C, Particles and fields
Year: 2020, Volume: 80, Issue: 8, Pages: 1-44
ISSN:1434-6052
DOI:10.1140/epjc/s10052-020-8102-8
Online Access:Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1140/epjc/s10052-020-8102-8
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Author Notes:ATLAS Collaboration
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Summary:A search for direct pair production of scalar partners of the top quark (top squarks or scalar third-generation up-type leptoquarks) in the all-hadronic $$t{\bar{t}}$$ plus missing transverse momentum final state is presented. The analysis of 139 $$\hbox {fb}^{-1}$$ of $${\sqrt{s}=13}$$ TeV proton-proton collision data collected using the ATLAS detector at the LHC yields no significant excess over the Standard Model background expectation. To interpret the results, a supersymmetric model is used where the top squark decays via $${\tilde{t}} \rightarrow t^{(*)} {\tilde{\chi }}^0_1$$, with $$t^{(*)}$$ denoting an on-shell (off-shell) top quark and $${\tilde{\chi }}^0_1$$ the lightest neutralino. Three specific event selections are optimised for the following scenarios. In the scenario where $$m_{{\tilde{t}}}> m_t+m_{{\tilde{\chi }}^0_1}$$, top squark masses are excluded in the range 400-1250 GeV for $${\tilde{\chi }}^0_1$$ masses below 200 GeV at 95% confidence level. In the situation where $$m_{{\tilde{t}}}\sim m_t+m_{{\tilde{\chi }}^0_1}$$, top squark masses in the range 300-630 GeV are excluded, while in the case where $$m_{{\tilde{t}}}< m_W+m_b+m_{{\tilde{\chi }}^0_1}$$ (with $$m_{{\tilde{t}}}-m_{{\tilde{\chi }}^0_1}\ge 5$$ GeV), considered for the first time in an ATLAS all-hadronic search, top squark masses in the range 300-660 GeV are excluded. Limits are also set for scalar third-generation up-type leptoquarks, excluding leptoquarks with masses below 1240 GeV when considering only leptoquark decays into a top quark and a neutrino.
Item Description:Im Titel steht der zweite Buchstabe t mit einem Oberstrich
Im Titel steht der Buchstabe s unter dem Wurzelzeichen
ATLAS collaboration: G. Aad, F. Bartels, M.M. Czurylo, S.J. Dittmeier, M. Dunford, S. Franchino, M. Klassen, A. Krishnan, A. Kugel, M. Mkrtchyan, F. Napolitano, P.S. Ott, A. Schoening, H.-C. Schultz-Coulon, R. Stamen, P. Starovoitov, L. Vigani, S.M. Weber, M. Wessels, X. Yue [und viele weitere]
Gesehen am 04.05.2022
Physical Description:Online Resource
ISSN:1434-6052
DOI:10.1140/epjc/s10052-020-8102-8

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