Search for top squarks decaying to tau sleptons in $pp$ collisions at $\sqrt{s}=13$ TeV with the ATLAS detector

Abstract

A search for direct pair production of top squarks in final states with two tau leptons, $b$-jets, and missing transverse momentum is presented. The analysis is based on proton-proton collision data at $\sqrt{s}=13$ TeV corresponding to an integrated luminosity of 36.1 fb${}^{-1}$ recorded with the ATLAS detector at the Large Hadron Collider in 2015 and 2016. Two exclusive channels with either two hadronically decaying tau leptons or one hadronically and one leptonically decaying tau lepton are considered. No significant deviation from the Standard Model predictions is observed in the data. The analysis results are interpreted in terms of model-independent limits and used to derive exclusion limits on the masses of the top squark ${\tilde{t}}_1$ and the tau slepton ${\tilde{\tau }}_1$ in a simplified model of supersymmetry with a nearly massless gravitino. In this model, masses up to $m({\tilde{t}}_1)=1.16$ TeV and $m({\tilde{\tau }}_1)=1.00$ TeV are excluded at 95% confidence level.

49 pages in total, author list starting on page 33, 7 figures, 9 tables, published in PRD. All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/SUSY-2016-19

References in corpus (31)

• PYTHIA 6.4 Physics and Manual
• The automated computation of tree-level and next-to-leading order differential cross sections, and their matching to parton shower simulations
• An Introduction to PYTHIA 8.2
• Parton distributions for the LHC
• New parton distributions for collider physics
• Event generation with SHERPA 1.1
• Herwig++ Physics and Manual
• A parton shower algorithm based on Catani-Seymour dipole factorisation
• Performance of the ATLAS Trigger System in 2015
• Single-top Wt-channel production matched with parton showers using the POWHEG method
• Two-loop soft anomalous dimensions for single top quark associated production with a W- or H-
• -- HATHOR -- HAdronic Top and Heavy quarks crOss section calculatoR
• Single-top hadroproduction in association with a W boson
• Next-to-next-to-leading-order collinear and soft gluon corrections for t-channel single top quark production
• NNLL resummation for s-channel single top quark production
• Luminosity determination in pp collisions at $\sqrt{s}$ = 8 TeV using the ATLAS detector at the LHC
• Simplified Models for a First Characterization of New Physics at the LHC
• Jet energy scale measurements and their systematic uncertainties in proton-proton collisions at $\sqrt{s}=13$ TeV with the ATLAS detector
• HATHOR for single top-quark production: Updated predictions and uncertainty estimates for single top-quark production in hadronic collisions
• Squark and gluino production cross sections in pp collisions at $\sqrt{s}$ = 13, 14, 33 and 100 TeV
• HistFitter software framework for statistical data analysis
• Electron efficiency measurements with the ATLAS detector using 2012 LHC proton-proton collision data
• Colour reconnections in Herwig++
• Evaluation of three methods for calculating statistical significance when incorporating a systematic uncertainty into a test of the background-only hypothesis for a Poisson process
• Identification and energy calibration of hadronically decaying tau leptons with the ATLAS experiment in $pp$ collisions at $\sqrt{s}$=8 TeV
• Search for the direct production of charginos, neutralinos and staus in final states with at least two hadronically decaying taus and missing transverse momentum in $pp$ collisions at $\sqrt{s}$ = 8 TeV with the ATLAS detector
• Search for top squarks in final states with one isolated lepton, jets, and missing transverse momentum in $\sqrt{s}=13$ TeV $pp$ collisions with the ATLAS detector
• Search for top squark pair production in pp collisions at sqrt(s) = 13 TeV using single lepton events
• Search for direct production of supersymmetric partners of the top quark in the all-jets final state in proton-proton collisions at sqrt(s) = 13 TeV
• Search for direct top squark pair production in final states with two leptons in $\sqrt{s}=13$ TeV $pp$ collisions with the ATLAS detector
• Herwig 7.2 Release Note

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• GUT Physics in the era of the LHC
• Search for new phenomena in $pp$ collisions in final states with tau leptons, $b$-jets, and missing transverse momentum with the ATLAS detector
• SModelS v2.3: enabling global likelihood analyses
• Electric dipole moment of ${}^{199}$Hg atom from P, CP-odd electron-nucleon interaction
• Funnel annihilations of light dark matter and the invisible decay of the Higgs boson
• Searching for heavy Higgs in supersymmetric final states at the LHC
• Same-sign trilepton signal for stop quark in the presence of sneutrino dark matter
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