Higgs to 2 t , 2b and BSM Higgs searches in CMS

1. Higgs to 2t, 2b and BSM Higgs searches in CMS Nikitenko (IC), Split, October 2012

2. Introduction • access to Higgs couplings yt, yb to down type fermions through measurement of • s xBr(f->tt, bb) Standard Model MSSM

3. Tools for searches with ts and bs

4. t tagging performance of HPS algorithm t ID uncertainty – 6 % t jet energy scale unc. < 3 %

5. b tagging performance • Identification using track impact parameter • TC, JP, JPB • Identification using secondary vertex • SSV • Identification using both track ip and secondary vertex • CSV

6. tt and bb mass resolution • tt ~ 20 % • bb: ~ 10 %

7. Search for SM H->ttin gg->H and VBF H production

8. Event categories • VBF category is most sensitive at mH=125 GeV pTt

9. results VBF 0 jet 1 jet

10. Search for SM H->bb in VH production

11. VH analysis strategy • 5 topologies: ZH (Z->ee,mm,nn), WH (W->ee,mm) • select events with high pTV and high pTH • normalize backgrounds (V+udscg, V+bb, tt) on the data in control regions from simultaneous fit in each mode • propagate to signal region using MC • Extract signal from the fit of BDT output

12. Results

13. Search for SM H->bb in ttH production To be completed

14. Analysis and result in one slide l+jets • l+jets and di-lepton analyses • Divide events in categories of (Njet, Nb-tag-jet) • Extract signal from fit of ANN outputs ll+jets

15. CMS prospects for SM Higgs searches with 30 fb-1

16. BSM CMS searches • MSSM charged Higgs in t->H+b decays • H+->tn • MSSM neutral f->tt, bb, mm • NMSSM a1->mm • double charged Higgs bosons

17. Searches for t->H+b (mH+ < mt) T. Plehn et al., hep-ph/0312286 • Study decay mode H+->tn assuming BR(H+->tn)=1 m H+ < mtm H+ > mt pp->tbH+ is in MC@NLO (T.Plehn et al) recipie for m H+ ~ mt: add tt and tbH+ 4FS and 5FS NLO calculations exist

18. CMS H+->tn. Topologies considered: NttSUSY> NttSM NttSUSY> NttSM NttSUSY< NttSM

19. Results of H+->tn analysis with 2.3 fb-1 Access or deficit of events in data is related to the difference between MSSM and SM tt~ event yields: th+jets x=Br(t->H+b) th+jets channel is most sensitive, since most of the tt~->WbWb background is measured from the data and mT shape is used

20. MSSM neutral f->tt • gfbbMSSM= gfbbSMx tanb (f=A) at tree level • sSM(gg->H) ~ 20-10 pb at mH = 115-140 GeV • Br (f->tt) ~ 10 %

21. Off-line Selections • e/m th - |he/m|<2.1, pTe>20 GeV, pTm>17 GeV, pTt>20 GeV, |ht|<2.3, second lepton veto • em - |he(m)|<2.3(2.1), pTl1,l2>20,10 GeV • cut on “CDF variable” Pzis used against W+jets • separation on b-tag and non-b-tag event categories Final states used: tmth teth tetm f->tt mass resolution ~ 20 %

22. tt: allowed region in mA-tanb • What theorists need to re-evalulatemA-tanb limits in any other scenario ? • sgg->hx egg->hb + sbbh x ebbhb < Nevb b-tag analysis • sgg->h x egg->hno-b + sbbh x ebbhno-b < Nevno-b 0-b-tag analysis Phys. Lett. B 713 (2012) 68

23. f->mm analysis • Two isolated muonspT > 30, 20 GeV, |h|<2.1 • ETmiss < 30 GeV (against tt~) • Three event category combined • at least one b-tag jet, pT > 20 GeV, |h|<2.4 • 3rdmuon (from b’s) pT > 3 GeV, |h|<2.4 • Other events CMS PAS HIG-12-011

24. bf, f->bb analysis (7 TeV) • Triple b-tagging; multijet background from data Fully hadronic analysis CMS PAS HIG-12-026 Leptonic analysis CMS PAS HIG-12-027

25. NMSSM a1->mm and F++F-(-)searhes gg->a1->mm qq->F++F-(-) 4 lept. CMS PAS HIG-12-004

26. Conclusions • SM H->tt and bb are very important for coupling measurement • expect good sensitivity with 30 fb-1 • Hunting for BSM Higgs boson(s) in new territory • no BSM Higgs boson(s) found yet • important to continue searches and extract model “independent” cross-sections in SUSY f->tt, mm, bb analyses

27. Background evaluation methods • eth, mth, em and mm final states are included in analysis DY->tt from data DY->mm with m-> MC t replacement DY->ll from MC corrected for l->t fake rate W from high mT control data region Multijet from SS data events

28. Results

29. Background scaling factors and shapes

30. Event selections and input variables for BDT • BDT output for WH (W->mn) high pT analysis at 8 TeV

31. MSSM Higgs bosons • Five Higgs bosons: h, H, A, H+/- • Higgs sector is defined at tree level by MA, tanb • rad. corrections introduce dependence on other model parameters • Upper limit on mh ~ 135 GeV

32. Search for NMSSM Higgs boson a1->mm • 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” : 2mt < ma1 < 2mb (prefers ma1 close to 2mb) Dermisek, Gunion 2010 • s(gg->a1) x BR(a1->mm) is defined by tanb and qA • a1 =cosqAaMSSM + sinqAaS At cosqA=1; s(gg->a1) ~ cos2qA Dermisek, Gunion 2009

33. t and b tagging is the tool for searches

34. Event selection and results • Selections • two isolated muonspT > 5.5 GeV, |h|<2.4 • two intervals in mmm ; h: barrel, endcapmm pairs • mmm background shape from fit of the data Background model from fit of data two mass intervals for signal search Signal mass resolution 50 – 120 MeV for barrel

35. Search for double charged Higgs • Higgs boson triplet F0, F+, F++ is predicted in little Higgs models, the minimal seesaw model of type II. • F++ Yukawa coupling matrix YFlilj is proportional to the light neutrino mass matrix and allows to test the neutrino masses by measuring BR(F++->lilj) • A.Hektor, M. Kadastik, M. Muntel et al., Nucl.Phys. B787 (2007) 198-210 Both pair production and associated production are studied NLO cross-sections: M. Muhlleitner M. Spira Phys. Rev. D68 (2003) 117701

36. Results 3 lept. pre-select. 4 lept. lept.=e, m, t CMS PAS HIG-12-005 3 lept.

37. t tagging performance t ID uncertainty – 6 % t jet energy scale unc. < 3 %

38. CMS Z->tt measurement

39. b tagging performance Efficiency High efficiency High purity Fake rate High efficiency High purity

40. 4FS vs 5FS in b(b)f cross-section “Santander matching” • by R. Harlander, M. Kramer, M. Schumacher CERN-PH-TH/2011-134. Presently used in SUSY H->tt ATLAS and CMS analyses 5FS 4FS

41. Signal generation issues (see details in LHC Higgs Xsection WG, YR2) • gg->h: presence of b-loop in gg->h has no effect on acceptance for the current analysis • PYTHIA gg->bbhvs bb->h at NLO • there is some discrepancy in pTb, hb at high mA. R. Harlander, M. Wiesemann, M. Cutajar, A. Nikitenko in YR2

42. CMS SUSY f->tt analysis combines b-tagged and non-b-tagged events • |hb-jet| < 2.4, |hjet| < 5.0 Efficiency of the signal selections is provided in the paper mth, mA=120 GeV

43. Results of H+->tn analysis with 2.3 fb-1 JHEP 1207 (2012) 143 ~ 8 At tanb ~ 8 Br(t->H+b) has a minimum in MSSM at a given m In the next iteration of analysis with whole 2011 dataset it might be possible to exclude mH+ < ~ 130 GeV, since for this mass region exp. exclusion limits on Br(t->H+b) might be smaller than minimal possible values in MSSM mhmax

44. f->mm analysis CMS PAS HIG-12-011 • Two isolated muonspT > 30, 20 GeV, |h|<2.1 • ETmiss < 30 GeV (against tt~) • Three event category combined • at least one b-tag jet, pT > 20 GeV, |h|<2.4 • 3rdmuon (from b’s) pT > 3 GeV, |h|<2.4 • Other events

45. bf, f->bb analysis (fully hadronic) CMS PAS HIG-12-026 • HLT: two b-tagged jets • Three jets |h|<2.2 • mf<180 GeV : pT> 46, 28, 20 GeV • Mf>180 GeV : pT>60, 53, 20 GeV • Multijet background: • from double-b-tag data h->bb mass resolution ~ 10 %

46. CMS PAS HIG-12-027 bf, f->bb analysis (leptonic) • HLT: m + 1 or 2 b-tagged jets • MuonpT > 15 GeV, no isol. applied • >= 3 jets, pT> 30, 30, 20 GeV with muon inside one of two leading jets • Triple b tagging • Multijet background from data