Aaboud, M;
Aad, G;
Abbott, B;
Abdinov, O;
Abeloos, B;
Abidi, SH;
AbouZeid, OS;
... Antonov, A; + view all
(2017)
Search for direct top squark pair production in events with a Higgs or Z boson, and missing transverse momentum in s√=13s=13 TeV pp collisions with the ATLAS detector.
Journal of High Energy Physics
, 2017
(8)
, Article 6. 10.1007/JHEP08(2017)006.
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Abstract
A search for direct top squark pair production resulting in events with either a same-flavour opposite-sign dilepton pair with invariant mass compatible with a Z boson or a pair of jets compatible with a Standard Model (SM) Higgs boson (h) is presented. Requirements on the missing transverse momentum, together with additional selections on leptons, jets, jets identified as originating from b-quarks are imposed to target the other decay products of the top squark pair. The analysis is performed using proton-proton collision data at s=13 TeV collected with the ATLAS detector at the LHC in 2015–2016, corresponding to an integrated luminosity of 36.1 fb −1 . No excess is observed in the data with respect to the SM predictions. The results are interpreted in two sets of models. In the first set, direct production of pairs of lighter top squarks (t˜ 1 ) with long decay chains involving Z or Higgs bosons is considered. The second set includes direct pair production of the heavier top squark pairs (t˜ 2 ) decaying via t˜ 2 → Zt˜ 1 or t˜ 2 → ht˜ 1 . The results exclude at 95% confidence level t˜ 2 and t˜ 1 masses up to about 800 GeV, extending the exclusion region of supersymmetric parameter space covered by previous LHC searches.[Figure not available: see fulltext.].
| Type: | Article |
|---|---|
| Title: | Search for direct top squark pair production in events with a Higgs or Z boson, and missing transverse momentum in s√=13s=13 TeV pp collisions with the ATLAS detector |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1007/JHEP08(2017)006 |
| Publisher version: | http://doi.org/10.1007/JHEP08(2017)006 |
| Language: | English |
| Additional information: | This article is distributed under the terms of the Creative Commons © The Author(s) 2017. Copyright CERN, for the benefit of the ATLAS Collaboration. Attribution License (CC-BY 4.0), which permits any use, distribution and reproduction in any medium, provided the original author(s) and source are credited. |
| Keywords: | Beyond Standard Model; Hadron-Hadron scattering (experiments); Higgs physics |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy |
| URI: | https://discovery-pp.ucl.ac.uk/id/eprint/1562473 |
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