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Search for direct top squark pair production in events with a Higgs or Z boson, and missing transverse momentum in √s=13 TeV pp collisions with the ATLAS detector

Aaboud, M ; Aad, G ; Abbott, B. ; Abdinov, O ; Abeloos, B ; Abidi, S. H. ; Åkesson, Torsten LU orcid ; Bocchetta, Simona LU ; Doglioni, Caterina LU and Hedberg, Vincent LU , et al. (2017) In Journal of High Energy Physics 2017(8).
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... (More)
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.]. © 2017, The Author(s). (Less)
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publishing date
type
Contribution to journal
publication status
published
subject
keywords
Beyond Standard Model, Hadron-Hadron scattering (experiments), Higgs physics
in
Journal of High Energy Physics
volume
2017
issue
8
article number
6
publisher
Springer
external identifiers
  • scopus:85026906104
ISSN
1029-8479
DOI
10.1007/JHEP08(2017)006
language
English
LU publication?
yes
additional info
Export Date: 5 September 2017
id
1aea3115-06ad-491e-818d-2443b9bcacda
date added to LUP
2017-09-05 08:32:37
date last changed
2023-04-07 22:19:27
@article{1aea3115-06ad-491e-818d-2443b9bcacda,
  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.]. © 2017, The Author(s).}},
  author       = {{Aaboud, M and Aad, G and Abbott, B. and Abdinov, O and Abeloos, B and Abidi, S. H. and Åkesson, Torsten and Bocchetta, Simona and Doglioni, Caterina and Hedberg, Vincent and Jarlskog, Göran and Kalderon, Charles and Lytken, Else and Mankinen, Katja and Mjörnmark, Ulf and Poulsen, Trine and Smirnova, Oxana and Viazlo, Oleksandr}},
  issn         = {{1029-8479}},
  keywords     = {{Beyond Standard Model; Hadron-Hadron scattering (experiments); Higgs physics}},
  language     = {{eng}},
  number       = {{8}},
  publisher    = {{Springer}},
  series       = {{Journal of High Energy Physics}},
  title        = {{Search for direct top squark pair production in events with a Higgs or Z boson, and missing transverse momentum in √s=13 TeV pp collisions with the ATLAS detector}},
  url          = {{http://dx.doi.org/10.1007/JHEP08(2017)006}},
  doi          = {{10.1007/JHEP08(2017)006}},
  volume       = {{2017}},
  year         = {{2017}},
}