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

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dc.contributor.authorAad, Georges
dc.contributor.authorAbbott, Brad K.
dc.contributor.authorAbbott, D. C.
dc.contributor.authorAbed Abud, Adam
dc.contributor.authorAbeling, Kira
dc.contributor.authorAbhayasinghe, D. K.
dc.contributor.authorAbidi, Syed Hani
dc.contributor.authorAbouZeid, O. S.
dc.contributor.authorAbraham, Nicola L.
dc.contributor.authorAbramowicz, Halina
dc.contributor.institutionAad, Georges, Aix Marseille Université, Marseille, France
dc.contributor.institutionAbbott, Brad K., Homer L. Dodge Department of Physics and Astronomy, The University of Oklahoma, Norman, United States
dc.contributor.institutionAbbott, D. C., Department of Physics, University of Massachusetts Amherst, Amherst, United States
dc.contributor.institutionAbed Abud, Adam, Organisation Européenne pour la Recherche Nucléaire, Geneva, Switzerland
dc.contributor.institutionAbeling, Kira, Institute of Physics, Georg-August-Universität Göttingen, Gottingen, Germany
dc.contributor.institutionAbhayasinghe, D. K., Department of Physics, Royal Holloway, University of London, Egham, United Kingdom
dc.contributor.institutionAbidi, Syed Hani, Department of Physics, University of Toronto, Toronto, Canada
dc.contributor.institutionAbouZeid, O. S., Niels Bohr Institutet, Copenhagen, Denmark
dc.contributor.institutionAbraham, Nicola L., Department of Physics and Astronomy, University of Sussex, Brighton, United Kingdom
dc.contributor.institutionAbramowicz, Halina, Raymond and Beverly Sackler School of Physics and Astronomy, Tel Aviv University, Tel Aviv-Yafo, Israel
dc.date.accessioned2025-10-05T15:46:19Z
dc.date.issued2020
dc.description.abstractA 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 tt¯ plus missing transverse momentum final state is presented. The analysis of 139 fb - 1 of 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 t~→t(∗)χ~10, with t(∗) denoting an on-shell (off-shell) top quark and χ~10 the lightest neutralino. Three specific event selections are optimised for the following scenarios. In the scenario where mt~>mt+mχ~10, top squark masses are excluded in the range 400–1250 GeV for χ~10 masses below 200 GeV at 95% confidence level. In the situation where mt~∼mt+mχ~10, top squark masses in the range 300–630 GeV are excluded, while in the case where mt~<mW+mb+mχ~10 (with mt~-mχ~10≥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. © 2020 Elsevier B.V., All rights reserved.
dc.identifier.doi10.1140/epjc/s10052-020-8102-8
dc.identifier.issn14346044
dc.identifier.issn14346052
dc.identifier.issue8
dc.identifier.scopus2-s2.0-85090049230
dc.identifier.urihttps://doi.org/10.1140/epjc/s10052-020-8102-8
dc.identifier.urihttps://hdl.handle.net/20.500.14719/10360
dc.identifier.volume80
dc.language.isoen
dc.publisherSpringer
dc.relation.oastatusAll Open Access
dc.relation.oastatusGold Open Access
dc.relation.oastatusGreen Accepted Open Access
dc.relation.oastatusGreen Open Access
dc.relation.sourceEuropean Physical Journal C
dc.titleSearch for a scalar partner of the top quark in the all-hadronic tt¯ plus missing transverse momentum final state at √s=13 TeV with the ATLAS detector
dc.typeArticle
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