Search for new phenomena in a lepton plus high jet multiplicity final state with the ATLAS experiment using $\sqrt{s}$ = 13 Tev proton-proton collision data

CERN-LHC. A search for new phenomena in final states characterized by high jet multiplicity, an isolated lepton (electron or muon) and either zero or at least three b-tagged jets is presented. The search uses 36.1 fb-1 of sqrt(s) = 13 TeV proton-proton collision data collected by the ATLAS experiment at the Large Hadron Collider in 2015 and 2016. The dominant sources of background are estimated using parameterized extrapolations, based on observables at medium jet multiplicity, to predict the b-tagged jet multiplicity distribution at the higher jet multiplicities used in the search. No significant excess over the Standard Model expectation is observed and 95% confidence-level limits are extracted constraining four simplified models of R-parity-violating supersymmetry that feature either gluino or top-squark pair production. The exclusion limits reach as high as 2.1 TeV in gluino mass and 1.2 TeV in top-squark mass in the models considered. In addition, an upper limit is set on the cross-section for Standard Model tttt production of 60 fb (6.5 times the Standard Model prediction) at 95% confidence level. Finally, model-independent limits are set on the contribution from new phenomena to the signal-region yields.

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Imported on November 17, 2025
Last update November 17, 2025
Keywords
  • cmenergies: 13000.0-13000.0
  • observables: Number of events
  • P P --> GLUINO GLUINO X
  • P P --> STOP1 STOP1 X
Defined In https://doi.org/10.1007/JHEP09(2017)088
Author Morad Aaboud
More Authors
Georges Aad
Brad Abbott
Ovsat Abdinov
Baptiste Abeloos
Syed Haider Abidi
Ossama AbouZeid
Nicola Abraham
Halina Abramowicz
Henso Abreu
Repository Name INSPIRE-HEP
Source Creation February 17, 2025
Source Modified March 26, 2025
Language English
Publication Year 2017-04-20