Beyond the Standard Model Higgs Boson Searches at DØ
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1 Beyond the Standard Model Higgs Boson Searches at DØ Nicolas Osman On behalf of the DØ Collaboration Centre de Physique des Particules de Marseille 28th July, 2011 PANIC11
2 2 Outline Tevatron and DØ Neutral MSSM Higgs NMSSM Higgs Doubly Charged Higgs Fermiophobic Higgs Conclusion
3 3 Accelerator & Detector Proton-anti proton s = 1.96 TeV fb-1 delivered fb-1 recorded
4 4 Neutral MSSM Higgs Bosons
5 5 MSSM Higgs Boson 5 MSSM Higgs bosons 3 neutral: H, h, A (φ) 2 charged: H+, H- φ Branching Ratios: ~90% to bb ~10% to ττ Coupling enhanced by tanβ τ φ φ ττ τ τ τ bφ bττ φ b b b φ b bφ bbb
6 6 φ ττ Last published result 1fb-1-1 New result: τ τ (5.4 fb ) μ h Submitted to PLB Signature: Isolated lepton and τh Opposite charge Main Background: 2 Mvis = (Pτ1+Pτ2+PT) Z ττ, W + jets, MJ
7 7 φ ττ Visible mass used to set cross section limits CLs method used at DØ Exclusion comparable to LHC at low mass Model independent MSSM Scenarios
8 8 bφ bττ Two channels: τμ τh (7.3 fb-1, submitted to PRL) τe τh (prelim. 3.7 fb-1) Selection: Isolated lepton, τh One tagged b-jet Multivariate technique reduces Z+jet, tt, MJ τμ τh
9 9 bφ bττ MVA distribution used to set cross section limits Most stringent limits from direct search at Tevatron
10 10 bφ bbb 5.2 fb-1 (PLB) Require 3-4 b-jets Large multijet background Use data-derived MJ model 3 jet pairs per event Use LH to select pair Also cut on LH at 0.65
11 11 bφ bbb Mbb is final discriminant Excesses at 120 & 200 (1-2 sigma)
12 12 DØ MSSM Combination Combine results Strongest Tevatron exclusion to date
13 13 Next-to-MSSM Higgs Bosons
14 14 h aa 4l μ (τ) μ (τ) a h a μ μ Add extra Higgs singlet to MSSM Mh > 82 GeV Signal: collinear Leptons
15 15 Doubly Charged Higgs Bosons
16 16 H++ H-- 4l Occur in extended Higgs sector models Little Higgs, 331 gauge model Same Sign Require at least 2 τ,1 μ Separated into channels depending on τ charge First search at hadron collider with 2 τh Opposite Sign
17 17 H++ H-- 4l Limits depend on BR of different channels MH < 123 GeV excluded for 100% 4τ First limits of this kind at Hadron collider
18 18 Fermiophobic Higgs Boson
19 19 hf γγ Higgs coupling to leptons suppressed γγ coupling x10 DT improves sensitivity Exclude Mhf < 112 GeV
20 20 Conclusions
21 21 Conclusions Range of non-sm Higgs searches at DØ These results include up to 8.2 fb-1 of data Recorded ~10 fb-1 so far: aiming for 11 fb-1 MSSM Higgs exclusions comparable to Moriond LHC results Investigations into excesses forthcoming Updated results expected to come in BSM Higgs Searches
22 22 Additional Slides
23 23 Tevatron Performance
24 24 DØ Data-Taking Efficiency Consistently ~ 90%
25 25 Old MSSM Combinations Combine 3 channels Last result 2009 Up to 2.6 fb-1 of data Combination with CDF (τ states only) Last update Up to 2.2 fb analysed
26 26 τh Identification Three τ types: Type 1: τ± π±ν (1 charged track, 0 EM clusters) Type 2: τ± π±π0ν (1 charged track, >1 EM clusters) Type 3: τ± π±ππν (>2 charged tracks) Dedicated NN to identify each type
27 27 b-jet Identification b-jets characterised by long life time Can be identified by: Impact parameter Secondary vertex Soft muon Combined in NN b-tagger Updating to MVA b-tagger
28 28 MSSM Scenarios At LO, MSSM parameterised by MA, tanβ Require more parameters at NLO Set limits using benchmark scenarios: Mh max: maximal mixing scenario No mixing: mixing parameter set to 0 Higgs sector coupling term, μ, is important Set limits for μ = ± 200 GeV
29 29 MSSM Scenarios Effective tanβ Increased Higgs Width
30 30 Modified Frequentist Limits Define hypotheses Htest and Hnull Log likelihood ratio (χ) is calculated: P n H test s = 2ln =s n ln 1 P n H null b s, b, n are expected number of signal, background events Vary n to calculate test, null and data χ
31 31 Modified Frequentist Limits Generate χs+b and χb distributions Define (frequentist) confidence limit: CLb =P b d CL s b =P s b d Calculate CLs (CLs+b/CLb) Bayesian priors used for systematics
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