Search for pair production of massive particles decaying into three quarks with the ATLAS detector in sqrt(s) = 7 TeV pp collisions at the LHC

Abstract

A search is conducted for hadronic three-body decays of a new massive coloured particle in sqrt(s) = 7 TeV pp collisions at the LHC using an integrated luminosity of 4.6/fb collected by the ATLAS detector. Supersymmetric gluino pair production in the context of a model with R-parity violation is used as a benchmark scenario. The analysis is divided into two search channels, each optimised separately for their sensitivity to high-mass and low-mass gluino production. The first search channel uses a stringent selection on the transverse momentum of the six leading jets and is performed as a counting experiment. The second search channel focuses on low-mass gluinos produced with a large boost. Large-radius jets are selected and the invariant mass of each of the two leading jets is used as a discriminant between the signal and the background. The results are found to be consistent with Standard Model expectations and limits are set on the allowed gluino mass.

28 pages plus author list (50 pages total), 6 figures, 7 tables, submitted to JHEP, all figures including auxiliary figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/SUSY-2012-16/

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• Towards an understanding of jet substructure
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• Naturalness and the Status of Supersymmetry
• Pileup subtraction for jet shapes
• Performance of jet substructure techniques for large-R jets in proton-proton collisions at sqrt(s) = 7 TeV using the ATLAS detector
• Scale-invariant resonance tagging in multijet events and new physics in Higgs pair production
• Light-quark and gluon jet discrimination in pp collisions at $\sqrt{s}$ = 7 TeV with the ATLAS detector
• Indirect Probes of the MSSM after the Higgs Discovery
• The Last Vestiges of Naturalness
• Unsafe but Calculable: Ratios of Angularities in Perturbative QCD
• Toward Multi-Differential Cross Sections: Measuring Two Angularities on a Single Jet
• Searches for light- and heavy-flavour three-jet resonances in pp collisions at sqrt(s) = 8 TeV
• On jet substructure methods for signal jets
• Search for massive supersymmetric particles decaying to many jets using the ATLAS detector in $pp$ collisions at $\sqrt{s}=8$ TeV
• Natural SUSY's Last Hope: R-parity Violation via UDD Operators
• Pulling Out All the Stops: Searching for RPV SUSY with Stop-Jets
• New Patterns of Natural R-Parity Violation with Supersymmetric Gauged Flavor
• Gauging the Way to MFV
• Boosting Searches for Natural SUSY with RPV via Gluino Cascades
• Supersymmetric Crevices: Missing Signatures of RPV at the LHC
• Jet Substructure by Accident
• Search for R-parity-violating supersymmetric particles in multi-jet final states produced in $p$-$p$ collisions at $\sqrt{s}=13$ TeV using the ATLAS detector at the LHC
• Jet substructure and probes of CP violation in Vh production
• Long-lived higgsinos as probes of gravitino dark matter at the LHC
• Exotic Signals of Vectorlike Quarks
• Pileup mitigation at the LHC: a theorist's view
• Search for R-parity violating supersymmetry with displaced vertices in proton-proton collisions at sqrt(s) = 8 TeV
• The Same-Sign Dilepton Signature of RPV/MFV SUSY
• Boosted Multijet Resonances and New Color-Flow Variables
• Searches for R-parity-violating supersymmetry in pp collisions at sqrt(s) = 8 TeV in final states with 0-4 leptons
• The same-sign top signature of R-parity violation
• Overview of searches for dark matter at the LHC
• Baryogenesis via Mesino Oscillations
• A framework for baryonic R-parity violation in grand unified theories
• Natural, R-parity violating supersymmetry and horizontal flavor symmetries
• Sensitivity of an Upgraded LHC to R-Parity Violating Signatures of the MSSM
• Search for new physics in events with high jet multiplicity and low missing transverse momentum in proton-proton collisions at sqrt(s) = 8 TeV
• Jet Substructure Templates: Data-driven QCD Backgrounds for Fat Jet Searches
• Baryonic violation of R-parity from anomalous $U(1{)}_H$
• Stealth QCD-like Strong Interactions and the t-tbar Asymmetry
• Axino LSP Baryogenesis and Dark Matter
• Higgs sector in NMSSM with right-handed neutrinos and spontaneous R-parity violation
• Soft RPV Through the Baryon Portal
• Search for pair-produced three-jet resonances in proton-proton collisions at $\sqrt{s}=$ 13 TeV
• Searches for pair-produced multijet resonances using data scouting in proton-proton collisions at $\sqrt{s}$ = 13 TeV
• Closing the light gluino gap with electron-proton colliders
• Performance and calibration of quark/gluon-jet taggers using 140 fb${}^{-1}$ of $pp$ collisions at $\sqrt{s}=13$ TeV with the ATLAS detector
• Supersymmetry - When Theory Inspires Experimental Searches
• The Light Gluino Gap
• Solving Combinatorial Problems at Particle Colliders Using Machine Learning