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Invisible Higgs CSC Note

Invisible Higgs CSC Note. CSC Note. Note editors: Gerald Oakham, Pauline Gagnon Wiki page: https://twiki.cern.ch/twiki/bin/view/Atlas/CSCInvisibleHiggs Mailing list: hn-atlas-cscinvisiblehiggs@cern.ch CVS repository: groups/Higgs/csc-hg-09/note and PhysicsAnalysis/HiggsPhys/InvisibleHiggs

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Invisible Higgs CSC Note

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  1. Invisible Higgs CSC Note

  2. ATLAS UK Higgs - 22/11/06

  3. CSC Note • Note editors: Gerald Oakham, Pauline Gagnon • Wiki page:https://twiki.cern.ch/twiki/bin/view/Atlas/CSCInvisibleHiggs • Mailing list:hn-atlas-cscinvisiblehiggs@cern.ch • CVS repository: groups/Higgs/csc-hg-09/note and PhysicsAnalysis/HiggsPhys/InvisibleHiggs • Contributing: 13 people from 6 institutes working independently on 3 channels ATLAS UK Higgs - 22/11/06

  4. First draft of CSC note • Common introduction • 3 major subsections, one per channel • MC samples description • Filter used and its effects • Trigger issues • Analysis strategy and systematics • Discovery/exclusion potential (limits on BR) • Statistical combination of discovery/exclusion potential • Common conclusion ATLAS UK Higgs - 22/11/06

  5. Vector-boson fusion M. Schram ETmiss (jet-jet) • Issues: • Trigger • Jet reconstruction • Background estimation • MC generation (Pythia 6.3x problem) and filtering • SM backgrounds: • W+2jets • Z+2jets • QCD dijets • ttbar • Atlfast studies so far plus LVL1 full sim trigger studies Mjj Reference Neukermans & Girolamo ATLAS UK Higgs - 22/11/06

  6. G. Hanniger Trigger for VBF • LVL1 rates crucial: • At low lumi ~40kHz for all processes • Aim for O(100) Hz from LVL1 (poor LVL2 rejection power for all-jets channel) • Playoff between ETmiss and jet pT to optimise LVL1 trigger ATLAS UK Higgs - 22/11/06

  7. ZH S. Subramania • Issues: • Background estimation • E.g. from ZZ4l to estimate ZZll • MC generator-level filter • Multivariate method • SM backgrounds: • ZZll (irreducible) • ZllX • ZW • ttbar • Atlfast studies so far plus LVL1 full sim studies of main background ATLAS UK Higgs - 22/11/06

  8. ttH ttbar • Issues: • Lower x-section • Background rejection • Lep-tau background • MC generator filter • Event reconstruction • SM backgrounds: • ttbar • ttZ tt (irreducible) • Atlfast studies so far • Full sim studies starting with trigger tth mT(GeV) ETmiss (GeV) ET (GeV) No cuts; Lumi = 1fb-1 ATLAS UK Higgs - 22/11/06

  9. INFO REGTEST Run summary: INFO REGTEST Events processed : 50 INFO REGTEST Level 1 passed : 44 INFO REGTEST Level 2 passed : 28 INFO REGTEST Event Filter passed : 0 Level type Sig. Name events passed L1 signature 2EM15I 2 L1 signature 2MU6 14 L1 signature 3JT90 4 L1 signature 4JT65 5 L1 signature EM25I 16 L1 signature HA25I+TM30 16 L1 signature JT200 8 L1 signature JT60+TM60 20 L1 signature MU10+EM15I 7 L1 signature MU20 25 L2 dummy L2_e10 0 ? L2 signature L2_e15iL2_e15i 0 L2 signature L2_e25i 0 ? L2 signature L2_e60 0 ? L2 signature L2_mu20i 20 L2 signature L2_mu6 28 L2 signature L2_mu6l 28 • Using 50 (!) ttH, H  bb events • Just finding bugs in code for now…but nearly there ATLAS UK Higgs - 22/11/06

  10. Summary • Vector Boson Fusion channel: • Bonn group: trigger issues • Dresden group: systematics comparing MC generators • Carleton group: di-jet + Ptmiss filter, mass scan • ZH channel: • Indiana group: filter, event selection, background normalisation • ttH channel: • Freiburg group: ATLFAST studies to be written up soon in Atlas note • Royal Holloway group: full reconstruction, starting with trigger • Aim to have more concrete results in ~3 months • One common mass point should be studied: mH=130GeV • Also looking at common analysis code (HiPtView?) ATLAS UK Higgs - 22/11/06

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