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SUSY Higgs @ D Ø

SUSY Higgs @ D Ø. Joint IPPP-Imperial Workshop 28 th May 2009 Jonathan Hays. Outline. Introducing the group Our activities SUSY Higgs @ D Ø Latest results Plans and Prospects. D Ø @ IC. SUSY @ DØ Integrated Luminosity. Current public results. Coming this summer. SUSY Higgs @ D Ø.

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SUSY Higgs @ D Ø

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  1. SUSY Higgs @ DØ Joint IPPP-Imperial Workshop 28th May 2009 Jonathan Hays

  2. Outline Introducing the group Our activities SUSY Higgs @ DØ Latest results Plans and Prospects

  3. DØ @ IC

  4. SUSY @ DØIntegrated Luminosity Current public results Coming this summer

  5. SUSY Higgs @ DØ http://www-d0.fnal.gov/Run2Physics/WWW/results/higgs.htm Currently searches in three signatures h→ : eµ, µhad, ehad bh→b : µhad, (+ehad in the future) bh→bbb : 3,4,5 jet final states (@IC) Generally search in model independent way 95% CL limit on ×Br Then interpret within some MSSM scenario

  6. Limit Setting Define test statistic using ratio of Poisson likelihoods MC Pseudo-experiments used to generate PDFs for s+b and b hypotheses Systematics introduced using Baysian approach with (generally) gaussian prior. Profile likelihood technique for dealing with nuisance parameters offers improved sensitivity CLs+b 1-CLb Jonathan Hays Imperial College

  7. b-tagging (@IC) Make use of soft-lepton tagging impact parameter secondary vertex Identify jets originating from b-quarks Combine outputs in NN to optimise identification Jonathan Hays Imperial College

  8. Inclusive di-tau Isolated electron or muon + hadronic tau (NN tau-ID) Visible mass distribution used for limit setting PRL 101 071804 (2008) – RunIIa

  9. Higgs with associated b-quarkdi-tau channel Isolated muon + hadronic tau + b-tagged jet NN and likelihood select against ttbar and QCD backgrounds – 2D distribution used for limit setting Earlier results: Phys. Rev. Lett. 102, 051804 (2009)   

  10. Higgs with associated b-quarkbb channel (@IC) Require 3 b-tagged jets Multijet background modelled from data Mbb used as input distribution to limit setting Δb effects significant Width can be larger than experimental resolution large variation with sign of µ

  11. Plans and Prospects Combinations! – with current data DØ combination currently in review (@IC) all three channels – results from ICHEP08 aiming for approval in time for SUSY09 … CDF-DØ h→ combination in progress (@IC) CDF-DØ all three channels – coming soon (@IC)

  12. Plans and Prospects New data – new results, plots shown for up to 2.6fb-1 New results using up to 4.1fb-1 coming this Summer Could get 10fb-1 per experiment by end of RunII plenty of room for extending the limits Go further… add in other searches @ Tevatron constraints on SUSY in broader context?

  13. SUSY Models Choose mhmax and no-mixing scenarios as benchmarks MSUSY = 1TeV µ=±200 GeV M2 = 200 GeV Xt = 2 MSUSY At = Ab M~g = 0.8MSUSY MSUSY = 2TeV µ=±200 GeV M2 = 200 GeV Xt = 0 At = Ab M~g = 0.8MSUSY

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