Search for supersymmetry in final states with missing transverse momentum and multiple $b$-jets in proton-proton collisions at $\sqrt{s}=13$ TeV with the ATLAS detector

Abstract

A search for supersymmetry involving the pair production of gluinos decaying via third-generation squarks into the lightest neutralino (${\tilde{\chi }}_1^0$) is reported. It uses LHC proton-proton collision data at a centre-of-mass energy $\sqrt{s}=13$ TeV with an integrated luminosity of 36.1 fb${}^{-1}$ collected with the ATLAS detector in 2015 and 2016. The search is performed in events containing large missing transverse momentum and several energetic jets, at least three of which must be identified as originating from $b$-quarks. To increase the sensitivity, the sample is divided into subsamples based on the presence or absence of electrons or muons. No excess is found above the predicted background. For ${\tilde{\chi }}_1^0$ masses below approximately 300 GeV, gluino masses of less than 1.97 (1.92) TeV are excluded at 95% confidence level in simplified models involving the pair production of gluinos that decay via top (bottom) squarks. An interpretation of the limits in terms of the branching ratios of the gluinos into third-generation squarks is also provided. These results improve upon the exclusion limits obtained with the 3.2 fb${}^{-1}$ of data collected in 2015.

55 pages in total, author list starting page 39, 11 figures, 8 tables, published version. All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/SUSY-2016-10/

References in corpus (24)

• 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
• 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
• Vector boson production at hadron colliders: a fully exclusive QCD calculation at NNLO
• Two-loop soft anomalous dimensions for single top quark associated production with a W- or H-
• Automatic spin-entangled decays of heavy resonances in Monte Carlo simulations
• 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
• Threshold resummation for squark-antisquark and gluino-pair production at the LHC
• Simplified Models for a First Characterization of New Physics at the LHC
• Soft gluon resummation for the production of gluino-gluino and squark-antisquark pairs at the LHC
• 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
• Electron and photon energy calibration with the ATLAS detector using LHC Run 1 data
• HistFitter software framework for statistical data analysis
• Colour reconnections in Herwig++
• Searching for Directly Decaying Gluinos at the Tevatron
• Search for strong production of supersymmetric particles in final states with missing transverse momentum and at least three b-jets at $\sqrt{s}=$ 8 TeV proton-proton collisions with the ATLAS detector
• Inclusive search for supersymmetry using razor variables in pp collisions at sqrt(s) = 13 TeV

Cited by in corpus (48)

• Jet Substructure at the Large Hadron Collider: Experimental Review
• Search for electroweak production of charginos and sleptons decaying into final states with two leptons and missing transverse momentum in $\sqrt{s}=13$ TeV $pp$ collisions using the ATLAS detector
• Reheating and Post-inflationary Production of Dark Matter
• Higgs boson potential at colliders: status and perspectives
• The Price of Tiny Kinetic Mixing
• Searches for physics beyond the standard model with the $M_{T2}$ variable in hadronic final states with and without disappearing tracks in proton-proton collisions at $\sqrt{s}=$ 13 TeV
• Gravitino thermal production revisited
• Optimisation of large-radius jet reconstruction for the ATLAS detector in 13 TeV proton-proton collisions
• GUT Physics in the era of the LHC
• Correlating the anomalous results in $b\to s$ decays with inert Higgs doublet dark matter and muon $(g-2)$
• Dark Mesons at the LHC
• Automated simulations beyond the Standard Model: supersymmetry
• Dark Matter Particle Explorer observations of high-energy cosmic ray electrons plus positrons and their physical implications
• Higgsino Dark Matter in the MSSM
• Supersymmetry and LHC Missing Energy Signals
• Superstring-Inspired Particle Cosmology: Inflation, Neutrino Masses, Leptogenesis, Dark Matter & the SUSY Scale
• Slow and Safe Gravitinos
• Search for supersymmetry in pp collisions at $\sqrt{s}=$ 13 TeV with 137 fb${}^{-1}$ in final states with a single lepton using the sum of masses of large-radius jets
• Search for supersymmetry in final states with missing transverse momentum and three or more $b$-jets in 139 fb${}^{-1}$ of proton$-$proton collisions at $\sqrt{s}=13$ TeV with the ATLAS detector
• Observable Proton Decay in Flipped SU(5)
• Inflation and Leptogenesis in High-Scale Supersymmetry
• A Model of Metastable EeV Dark Matter
• The Return of the WIMP: Missing Energy Signals and the Galactic Center Excess
• Lepton-portal Dark Matter in Hidden Valley model and the DAMPE recent results
• A Minimal SU(5) SuperGUT in Pure Gravity Mediation
• Properties of $g\to b\bar{b}$ at small opening angles in $pp$ collisions with the ATLAS detector at $\sqrt{s}=13$ TeV
• Higgsino Dark Matter in Pure Gravity Mediated Supersymmetry
• New Inflation in Supersymmetric SU(5) and Flipped SU(5) GUT Models
• Status of searches for electroweak-scale supersymmetry after LHC Run 2
• Resolving the $(g-2{)}_{\mu }$ Discrepancy with $\mathcal{F}$-$SU$(5) Intersecting D-branes
• Mixed WIMP-axion dark matter
• Gravitino Thermal Production, Dark Matter, and Reheating of the Universe
• Supersymmetry and the collider Dark Matter picture
• Limits on $R$-parity Violation in High Scale Supersymmetry
• Spinning No-Scale $\mathcal{F}$-$SU$(5) in the Right Direction
• Scale-Invariant Two Component Dark Matter
• Predicting the Sparticle Spectrum from Partially-Composite Supersymmetry
• The Heavy Gluino in Natural No-Scale $\mathcal{F}$-$SU$(5)
• Novel Higgsino Dark Matter Signatures at the LHC
• Inverse seesaw mechanism with compact supersymmetry: enhanced naturalness and light super-partners
• Non-Universal Gaugino Masses in the NMSSM
• Higgsino Dark Matter in an economical Scherk-Schwarz setup
• Measurement of jet substructure in boosted $t\bar{t}$ events with the ATLAS detector using 140 fb${}^{-1}$ of 13 TeV $pp$ collisions
• The PeV-Scale Split Supersymmetry from Higgs Mass and Electroweak Vacuum Stability
• Scherk-Schwarz orbifolds at the LHC
• Prospects of Gluino searches in multi-lepton channels in the light of ongoing LHC RUN-III
• Gravitino thermal production
• Revisiting the gluino mass limits in the pMSSM in the light of the latest LHC data and Dark Matter constraints