BSM Higgs in ATLAS and CMS

Transcription

1 BSM Higgs in ATLAS and CMS A.-M. Magnan Imperial College London 11/01/2012, BSM 4 LHC UK Workshop A.-M. Magnan BSM Higgs in ATLAS and CMS Durham, 11/01/ / 32

2 Introduction Extensions to Standard Model: additional Higgs bosons. Neutral Higgs similar to SM Higgs, but different couplings. Branching ratios (BR) for Higgs decays can be enhanced significantly depending on parameter space. MSSM Higgs Searches at LHC 5 physical Higgs bosons: Φ (h 0, H 0, A 0 ) and H ± Φ τ + τ, Φ + b τ + τ + b H + τ + ν τ,h + c s Extended Higgs sector models Doubly Charged Higgs (H ±± ). NMSSM.... Fermiophobic Higgs Model (FHM) BR to fermions highly suppressed: Higgs couples primarily to bosons. Φ γγ based on SM Higgs results, not shown here. A.-M. Magnan BSM Higgs in ATLAS and CMS Durham, 11/01/ / 32

3 Introduction MSSM Neutral Higgs MSSM Charged Higgs Doubly Charged Higgs NMSSM Conclusion The Tools: the ATLAS and CMS detectors ATLAS CMS Tracker: σ/pt ' pt 0.01 Tracker: σ/pt ' pt Muon 1 TeV: σ/pt ' 0.07 Muon 1 TeV: σ/pt ' 0.10 A.-M. Magnan BSM Higgs in ATLAS and CMS Durham, 11/01/ / 32

4 Summary of channels covered in this talk Channel ATLAS CMS MSSM Φ τ + τ eµ, e/µτ had, τ had τ had eµ, e/µτ had b b + Φ b b + τ + τ 1.06 fb fb 1 ATL-CONF CMS-PAS-HIG pp t t H + W b b, H + τ + ν τ τ e, µ, τ had e + µ, µ + τ had, hadronic pp t t H + H b b, H ± τν τ 1.03 fb fb 1 ATL-CONF ,-151 CMS-PAS-HIG pp t t H + W b b H + c s fb 1 - ATL-CONF Extended Higgs sector pp H ++ H, pp H ++ H H ±± µ ± µ ± H ±± l ± l ±, H ± l, l = e, µ, τ 1.6 fb fb 1 ATL-CONF CMS-PAS-HIG NMSSM a 1 µ + µ fb 1 - ATL-CONF A.-M. Magnan BSM Higgs in ATLAS and CMS Durham, 11/01/ / 32

5 Physics Objects Reconstruction and Identification Objects used: electrons, muons, taus, jets, b-jets. Object Building Blocks Identification Isolation Electrons tracks, ECAL clusters Shower shape. Tight for selection, Loose for rejection tracks+calo deposits R = , absolute or relative Muons central+muon tracks Fit quality, inner hits. Tight for selection, Loose for rejection tracks+calo deposits R = , absolute or relative Jets Tracks, ECAL+HCAL clusters. Particle Flow (CMS) - Anti-k T 0.4/0.5 AT- LAS/CMS Hadronic Taus Jets, tracks, ECAL+HCAL Likelihood, BDT (ATLAS), - clusters PF-based decay topologies HPS, neural net (CMS) b-tagging tracks, secondary vertices Track counting, Flight decay significance. Loose WP. - A.-M. Magnan BSM Higgs in ATLAS and CMS Durham, 11/01/ / 32

6 Performance of tau-id Algorithms All decays considered. Hadronic decays: tau ID, very similar performances for ATLAS and CMS. ATLAS CMS A.-M. Magnan BSM Higgs in ATLAS and CMS Durham, 11/01/ / 32

7 MSSM Higgs Sector Five Higgs bosons: h, A, H, H +, H. At tree level, Higgs sector of MSSM defined by m A and tanβ. Radiative corrections: dependence on additional parameters. Upper theoretical limit on m h 135 GeV. A.-M. Magnan BSM Higgs in ATLAS and CMS Durham, 11/01/ / 32

8 The pp Φ + X, Φ ττ channel Coupling enhanced: at tree-level g(bba MSSM ) = g(bba SM ) tanβ. σ SM (gg H) = pb for m H = GeV. BR(Φ ττ) 10%. A.-M. Magnan BSM Higgs in ATLAS and CMS Durham, 11/01/ / 32

9 Validation with SM measurements Z+b process Z ττ A.-M. Magnan BSM Higgs in ATLAS and CMS Durham, 11/01/ / 32

10 Analysis Setup eµ e/µτ ττ CMS iso e,µ p T > 20, 10 GeV p T > 20/15 GeV - η < 2.5, 2.1 η < opp charges - veto other leptons - τ h - p T > 20 GeV - - η < W+jets rejection P ζ 0.85Pξ vis P ξ 0.5Pξ vis > 20 GeV - Jets Max 1 jet p T > 30 GeV - b-jet TCHE, p T > 20 GeV - ATLAS iso e,µ p T > 22, 10/20, 15 GeV p T > 25/20 GeV - η < 2.47, 2.5 η < 2.47, opp charges veto other leptons τ h - p T > 20 GeV p T > 45, 30 GeV - η < 2.5 η < 2.5 W+jets rejection pt e + pµ + MET < 120 GeV MET > 20 GeV MET > 25 GeV T φ(e, µ) > 2.0 m T < 30 GeV A.-M. Magnan BSM Higgs in ATLAS and CMS Durham, 11/01/ / 32

11 Background Evaluation Methods Reconstruct ττ mass for each final state. Use data-driven shape for dominant backgrounds. Z ττ: embedding method, using Z µµ events replacing muons by simulated taus with same kinematics event-by-event. QCD/W+jets: ABCD method, use sign and isolation criteria to define signal and bkg regions, n A = n B n C nd Several definitions of m ττ. Likelihood fit, add systematics as nuisance parameters. CMS ATLAS all eµ e/µτ ττ Mass likelihood m eff ττ q(p = τ + + p τ + p miss ) 2 m MMC m visible Reso@130GeV 21%? 17% 24% Z ττ Z µµ Z µµ QCD same-sign ABCD same-sign ABCD W+jets same-sign MC same-sign MC/embedding W µν Others MC MC MC MC A.-M. Magnan BSM Higgs in ATLAS and CMS Durham, 11/01/ / 32

12 ATLAS Control Plots A.-M. Magnan BSM Higgs in ATLAS and CMS Durham, 11/01/ / 32

13 ATLAS Results All channels combined. Fully hadronic channel improves high-mass limits. A.-M. Magnan BSM Higgs in ATLAS and CMS Durham, 11/01/ / 32

14 CMS Control Plots No b-tag At least one b-tag A.-M. Magnan BSM Higgs in ATLAS and CMS Durham, 11/01/ / 32

15 CMS Results Most up-to-date exclusion with full 2011 dataset. Better limits: improved by using b-tagging. Reach tanβ = 7.8 at m A = 160 GeV. A.-M. Magnan BSM Higgs in ATLAS and CMS Durham, 11/01/ / 32

16 Issue with LHC simulation J. Alwall, Q Li, F. Maltoni arxiv: Only top-loop included in gg Φ simulation in LHC analysis. MSSM with high tanβ and mhmax scenario: b-loop dominates softer spectrum for pt(φ). After final analysis acceptance: small effect. A.-M. Magnan BSM Higgs in ATLAS and CMS Durham, 11/01/ / 32

17 MSSM Charged Higgs Sector Production: gg t t H ± W b b, H + H b b for m H ± <m t or gb th for m H ± >m t. BR(t Hb) highly dependent on tanβ. BR(H ± τν τ )> 95% for tanβ > 3. T. Plehn et al., hep-ph/ A.-M. Magnan BSM Higgs in ATLAS and CMS Durham, 11/01/ / 32

18 Topologies considered BR(H ± /W ± τν τ )=1/0.1 N SUSY t t > N SM t t N SUSY t t > N SM t t Very soft leptons from H ± N SUSY t t < N SM t t A.-M. Magnan BSM Higgs in ATLAS and CMS Durham, 11/01/ / 32

19 CMS Results channel-by-channel Fully Hadronic Leptonic µτ Leptonic eµ A.-M. Magnan BSM Higgs in ATLAS and CMS Durham, 11/01/ / 32

20 CMS Results combined Results being updated for Moriond 2012 with 2 fb 1 and shape analysis. A.-M. Magnan BSM Higgs in ATLAS and CMS Durham, 11/01/ / 32

21 ATLAS analysis in fully hadronic channel A.-M. Magnan BSM Higgs in ATLAS and CMS Durham, 11/01/ / 32

22 ATLAS analysis in single-lepton channels A.-M. Magnan BSM Higgs in ATLAS and CMS Durham, 11/01/ / 32

23 ATLAS analysis in di-lepton channels A.-M. Magnan BSM Higgs in ATLAS and CMS Durham, 11/01/ / 32

24 Results for ATLAS analysis in leptonic channels A.-M. Magnan BSM Higgs in ATLAS and CMS Durham, 11/01/ / 32

25 ATLAS Results for low tanβ H + c s channel Old analysis with 2010 data, valid at low tanβ. A.-M. Magnan BSM Higgs in ATLAS and CMS Durham, 11/01/ / 32

26 Search for doubly charged Higgs Higgs boson triplet Φ 0, Φ +, Φ ++ is predicted in little Higgs models Φ ++ Yukawa coupling matrix Y Φ li l j is proportional to the light neutrino mass matrix and allows to test the neutrino masses by measuring BR(Φ ++ l i l j ) A.Hektor, M. Kadastik, M. Muntel et al., Nucl.Phys. B787 (2007) Leptons 3 Leptons A.-M. Magnan BSM Higgs in ATLAS and CMS Durham, 11/01/ / 32

27 Event selection and backgrounds at CMS A.-M. Magnan BSM Higgs in ATLAS and CMS Durham, 11/01/ / 32

28 CMS Results A.-M. Magnan BSM Higgs in ATLAS and CMS Durham, 11/01/ / 32

29 A.-M. Magnan BSM Higgs in ATLAS and CMS Durham, 11/01/ / 32

30 Search for NMSSM Higgs a 1 µµ NMSSM solves MSSM m-term problem by introducing additional complex singlet scalar field S. neutral Higgs boson sector expands to three CP-even scalars (h1,h2,h3), two CP-odd scalars (a1,a2). Ideal - NMSSM Higgs scenarios : 2m τ < m a1 < 2m b (prefers m a1 close to 2m b ), Dermisek, Gunion A.-M. Magnan BSM Higgs in ATLAS and CMS Durham, 11/01/ / 32

31 ATLAS Results A.-M. Magnan BSM Higgs in ATLAS and CMS Durham, 11/01/ / 32

32 Conclusion BSM Higgs well-covered at LHC. Some channels studied at Tevatron not covered yet at LHC: e.g. MSSM bbh to bbb. Similar channels covered by ATLAS and CMS. Fully hadronic MSSM H ττ improves ATLAS limits, but CMS limits also much improved by requiring b-tagging. Parameter space closing in for MSSM H ττ: going now as low as tanβ = 7.8 at m A = 160 GeV. Most results expected to be updated for Moriond 2012 on full 2011 dataset. A.-M. Magnan BSM Higgs in ATLAS and CMS Durham, 11/01/ / 32

33 Backups Backups BACKUPS A.-M. Magnan BSM Higgs in ATLAS and CMS Durham, 11/01/ / 32

34 Backups ATLAS and CMS calorimeters ATLAS Calorimeters EM: η < 3.2, Pb/LAr calorimeter, X o, 1.2 λ, 3 longitudinal sections, η Φ = σ/e 10%/ E. Central Hadronic: η < 1.7, Fe/Scintillator sampling calorimeter 7.4 λ, 3 longitudinal sections, η Φ = , σ/e 50%/ E EndCap Hadronic: 1.7 < η < 3.2, Cu/LAr sampling calorimeter, 4 longitudinal sections, η Φ = FCAL: 3 < η < 4.9, EM: Cu/LAr, HAD: W/LAr calorimeter, 10 λ, 1 EM + 2 HAD longitudinal sections, η Φ = CMS calorimeters EM : η < 3, PbWO 4 cristals, X o, 1.1 λ, 1 longitudinal section + preshower (3 X o), η Φ = , σ/e 2 5%/ E. HCAL : η < 3, Brass/Scintillator sampling calorimeter, 6-10 λ 2 longitudinal sections + Outer HCAL (3 λ for η < 1.4) η Φ , σ/e 100%/ E HF : 3 < η < 5, Fe/Quartz fibers, Cerenlov light EM 90 X o, HAD 9.5 λ 1 EM + 1 HAD longitudinal sections A.-M. Magnan BSM Higgs in ATLAS and CMS Durham, 11/01/ / 32