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The ATLAS Exotics Program

The ATLAS Exotics Program. G. Watts (UW/Seattle) ATLAS Searches 2014 LBNL, 1/27/2014. Phase Space. Model Phase Space. Final State Phase Space. Exotics… has got to be the hardest physics group to run!. Reach Plot. Final State Objects. The standard ones: Electrons, muons, jets,.

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The ATLAS Exotics Program

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  1. The ATLAS Exotics Program G. Watts (UW/Seattle) ATLAS Searches 2014 LBNL, 1/27/2014

  2. Phase Space Model Phase Space Final State Phase Space Exotics… has got to be the hardest physics group to run! G. Watts/UW Seattle

  3. Reach Plot G. Watts/UW Seattle

  4. Final State Objects The standard ones: Electrons, muons, jets, Tau final state • Leptonic decays () • Hadronic Decays () • Thin Jets, small # of tracks (1 or 3) This topology can be taken advantage of for non- final state objects Fat-jets • Anti- with size of ~1.2 • Sub-jet analysis run on jet constituents • Meaninfuljet mass Used for highly boosted objects that then decay, like a or a . G. Watts/UW Seattle

  5. Final State Objects – Displaced Vertices “on the importance of unicorns…” • Can occur throughout the detector • Traditionally we have not designed the detector appropriately… Small Radius (mm, to 1 cm or so) Calorimeters • Traditional b-tagging • Detectors are tuned to do this • High efficiency and low fake rate • Not possible Muon Spectrometer • ATLAS has enough resolution to make a crude vertexing algorithm Inner Tracker • Still use tracks • Large impact parameters means re-tuning track finding • CPU expensive, but possible G. Watts/UW Seattle

  6. Final state objects dE/dx Massive slow moving particles (WIMPS) via Bethe-Block • Pixels and Silicon (SCT) • Transition Radiation Detector (TRT) Time of flight • Tile-Calorimeter has ps time resolution Out-of-time decays • Run the DAQ during no-beam conditions in the LHC Stopped hadrons Others possible… G. Watts/UW Seattle

  7. Final States Most combinations of objects have been explored to some extent • Mono-photon/mono-jet + • Multi-photon + • Multi photon + multi lepton • Multi-lepton • Multi-lepton + Typically with a mass cut or resonance search as well • Lepton + Jets • 2 leptons + jets • Dijets Typically with a mass cut or resonance search as well • Displaced Lepton-jets • Displaced jets • Lepton + + lepton-jets G. Watts/UW Seattle

  8. Triggers single medium- objects not an option! bunch spacing, protons in bunch, beam tunes and focus your favorite trigger squeezed here rate limit driven by $$ disk, cpu, etc. G. Watts/UW Seattle

  9. Avoid the triggers Look in association with ISR or W/Z production Cuts your production, but lets you search for soft or low S:B new phenomena when The will be lost in the background! Look for associated production G. Watts/UW Seattle

  10. High mass Charged Higgs Search () Transverse Mass of system G. Watts/UW Seattle

  11. Pileup And Environment Next run… ? G. Watts/UW Seattle

  12. Exotic Higgs Sector We are not done yet Non-standard Higgs Production Non-standard Higgs Decays G. Watts/UW Seattle

  13. High Mass Higgs Decays Original Higgs searches live on… Motivated by the 2HDM’s high mass resonance search +X included The number of extra jets in the analysis dictates the backgrounds Minor modifications in the cuts Btagging veto… G. Watts/UW Seattle

  14. High mass higgs Search GeV TeV GeV GeV + topological cuts (VBF, etc.) G. Watts/UW Seattle

  15. FCNC: , One of the largest FCNC Branching Ratios - 2HDM, MSSM : GeV 2 b-tags + 2 jets + (leptons, jets) Second top goes hadronically for : and Second top goes semileptonically for : and G. Watts/UW Seattle

  16. FCNC: , G. Watts/UW Seattle

  17. Multi-Higgs Decays Simplified model Cascade Decays Heavy is the primary background Intermediate “Our” 125 GeV Higgs Multivariate analysis using the mass of possible top quarks, along with the masses G. Watts/UW Seattle

  18. HV Higgs to displaced Hadronic jets Long lived Vertexing in the ATLAS Muon Spectrometer Improvements should make new types of searches possible The 2011 analysis looked for two displaced decays in the MS G. Watts/UW Seattle

  19. Associated production Jets of leptons (electrons) Two step model Identified by a combination of calorimeter parameters and Prompt electron-jets G. Watts/UW Seattle

  20. Associated production This will improve dramatically with the 8 TeV Data G. Watts/UW Seattle

  21. Fat Jets and resonances Fat or thin One jet with GeV, GeV, first split scale is GeV Three well separated jets G. Watts/UW Seattle

  22. Fat Jets and resonances G. Watts/UW Seattle

  23. Conclusions • A very small selection of what ATLAS Exotics has looked at • Many experts in the room • Some models (like VLQ) appear in in models that add extra Higgs bosons, or exotics decays • Exotic Higgs decay is only just getting started • The detector’s capabilities are quite broad • Exotic final states to more traditional ones • Limited by time, upgrade, and backgrounds • Finding the results • Exotics & Higgs public results pages • Higgs BSM are mixed in with the SM results G. Watts/UW Seattle

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