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D i-Higgs Production

Cigdem Issever. D i-Higgs Production . New boson → New Probe for BSM Increase in collision energy → Higher sensitivity Search for BSM with Higgs final states!. Transition from Run1 to Run2. Oxford’s Exotics Group’s Run1 activities Resonance Searches and Threshold Effects

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D i-Higgs Production

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  1. Cigdem Issever Di-Higgs Production New boson → New Probe for BSM Increase in collision energy → Higher sensitivity Search for BSM with Higgs final states!

  2. Transition from Run1 to Run2 Oxford’s Exotics Group’s Run1 activities • Resonance Searches and Threshold Effects • Dijet final states  mjj ~ 5 TeV • Leading ATLAS dijet search paper (Kate) • Dijet Angular distribution searches (Ryan) • Boosted ttbar final states (Jiahang, Sarah, Katharina) • Jiahang: Exotics HQT convener • Performance work • Jet algorithms (Lucy, Katharina, Jeff,Cigdem) • Jet calibration (Lucy) • Jet punch-through (Shaun, Todd) C. Issever, University of Oxford

  3. Direct Searches for BSM → 2H • Resonance Searches • CMS excludes < 360 GeV • CMS-PAS-HIG-13-025 • Two Higgs Doublet Models (2HDMs) • Multi-lepton final states • ATLAS excludes < 790 GeV • ATLAS-CONF-2014-005 • 2H →4b, resolved • KK Graviton G* → 2H → Number of observed events m(HH) m(X) • Oxford Run2 Plans: Search for BSM in 2H → final states • Semi-boosted regime: 150 GeV < pT(H) < 250 GeV • Boosted regime: pT(H)>250 GeV • Matches our Run1 experience: dijet and ttbar searches, jets C. Issever, University of Oxford

  4. Non Resonant Searches • Assume BSM sector is heavy → HEFT • Deviations in kin. distributions and cross sections predicted • Search for deviations from the expected shape • mHH • Pt(H) • … C. Issever, University of Oxford

  5. Non-Resonant Searches C. Issever, University of Oxford

  6. Towards end of Run2 – Higgs Self coupling • Currently studies suggest 600 fb-1 needed. • Assumes state of the art experimental techniques • Uses easy final states with low backgrounds • 4b high rates – backgrounds a problem • Group is working and developing new techniques • Jets • Boosted particle ID • Future add • Boosted b-tagging • Colour flow variables • … • Improvement of the state of the art • Essential • Non-trivial Feasibility study with Juan C. Issever, University of Oxford

  7. Objectives for Run2 • Add Searches in 2H → 4b to Exotics program • (potentially also 2b+2W, 2b+2tau) • Resonance • Non resonance • Measure 2H rate to constrain λ • Performance • Jet algorithms (Variable R jets, SC-Jets, see Jeff’s talk) • Jet calibration • Boosted b-tagging (Variable R TRACKjets) • Jet-Pull (colour flow) variables (Background reduction) C. Issever, University of Oxford

  8. Backup Slides C. Issever, University of Oxford

  9. Variable R Jets – boosted tops – jet mass cut 1000 GeV < pTjet <2000 GeV 2000 GeV < pTjet < 3000 GeV C. Issever, University of Oxford

  10. B-tagging C. Issever, University of Oxford

  11. Colour Flow C. Issever, University of Oxford

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