Search for the Standard Model Higgs boson in the H > WW > lvjj decay channel at √s = 8 TeV

This is a condensed description with plots for the analysis CMS-HIG-12-021

Abstract

A search for the Standard Model Higgs boson decaying to two W bosons with the subsequent decay to a final state containing one lepton, one neutrino, and two jets is presented. The results are based on a data sample corresponding to an integrated luminosity of 5.1 fb−1 of proton-proton collisions at √s = 8 TeV and collected with the CMS detector at the CERN LHC in 2012. Selections to discriminate between the signal and background events are based on kinematic and topological quantities including the angular spin correlations between the decay products. No evidence for the Higgs boson is found. Using 8 TeV data, we exclude the Standard Model Higgs boson in the mass range 260-460 GeV at 95% confidence level. When combined with 7 TeV data, the exclusion range expands to 230-480 GeV at 95% confidence level.

Figures from CMS-HIG-12-021

figure label description
mu_mjj.png Figure 1 (a) png,pdf The invariant mass of the di-jet system after the physics object selection but before optimization, for the case of muons 2-jets sample.
mu_mlvjj.png Figure 1 (b) png,pdf The invariant mass of the four-body system after the physics object selection but before optimization, for the case of muons 2-jets sample.
mu_phi.png Figure 2(top left) png,pdf Variable Φ used as input for the likelihood discriminant.
mu_phib.png Figure 2(top middle) png,pdf Variable Φ1 used as input for the likelihood discriminant.
mu_ha.png Figure 2(top right) png,pdf Variable Θ1 used as input for the likelihood discriminant.
mu_hb.png Figure 2(middle left) png,pdf Variable Θ2 used as input for the likelihood discriminant.
mu_hs.png Figure 2(middle middle) png,pdf Variable Θ* used as input for the likelihood discriminant.
mu_ptlvjj.png Figure 2(middle right) png,pdf Variable pT(WW) used as input for the likelihood discriminant.
mu_etalvjj.png Figure 2(bottom left) png,pdf Rapidity of the WW system used as input for the likelihood discriminant.
mu_mva2j190_signal.png Figure 2(bottom middle) png,pdf Likelihood discriminant for muon plus 2 jet channel with selection optimized for Higgs mass hypothesis 190 GeV.
mu_mva2j500_signal.png Figure 2(bottom right) png,pdf Likelihood discriminant for muon plus 2 jet channel with selection optimized for Higgs mass hypothesis 500 GeV.
H200_Mjj_Muon_2jets_Stacked.png H300_Mjj_Muon_2jets_Stacked.png H500_Mjj_Muon_2jets_Stacked.png Figure 3(a) png pdf, Figure 3(b) png pdf, Figure 3(c) png pdf The di-jet invariant mass distribution with the fit projections, for the muon 2-jet category, after selections optimized for the Higgs mass hypotheses of 200 GeV (a), 300 GeV (b), and 500 GeV (c). The fit doesn't include data points in the test region between the vertical lines.
H200_Mlvjj_Muon_2jets_WpJShape.png H300_Mlvjj_Muon_2jets_WpJShape.png H500_Mlvjj_Muon_2jets_WpJShape.png Figure 4(a) png pdf, Figure 4(b) png pdf, Figure 4(c) png pdf The distribution of the extrapolated background shape in the signal region for the Higgs mass hypothesis of 200 GeV (a), 300 GeV (b), and 500 GeV (c), for muon 2-jets category. The black markers represent the extrapolated points, while the blue curve is the smooth parametrization using an exponential function. The dashed bands show the envelope of the systematic uncertainty in the shape extrapolation.
H200_Mlvjj_Muon_2jets_Stacked.png Figure 5(a) png pdf The WW invariant mass distribution with the fit projections, for the muon 2-jet category, after selection optimized for the Higgs mass hypotheses of 200 GeV.
H300_Mlvjj_Muon_2jets_Stacked.png Figure 5(b) png pdf The WW invariant mass distribution with the fit projections, for the muon 2-jet category, after selection optimized for the Higgs mass hypotheses of 300 GeV.
H500_Mlvjj_Muon_2jets_Stacked.png Figure 6 png pdf The WW invariant mass distribution with the fit projections, for the muon 2-jet category, after selection optimized for the Higgs mass hypotheses of 500 GeV.
limit_4chan_fullsyst_asymp.png Figure 6(a) png pdf Observed (solid) and expected (dashed) 95% CL upper limit on the ratio of the production cross section to the SM expectation for the Higgs boson obtained using the asymptotic CLS technique. The 68% and 95% ranges of expectation for the background-only model are also shown with green and yellow bands, respectively. The solid line at 1 indicates the SM expectation. Limit derived from 8 TeV data is shown.
limit_7and8tevcombined.png Figure 6(b) png pdf Observed (solid) and expected (dashed) 95% CL upper limit on the ratio of the production cross section to the SM expectation for the Higgs boson obtained using the asymptotic CLS technique. The 68% and 95% ranges of expectation for the background-only model are also shown with green and yellow bands, respectively. The solid line at 1 indicates the SM expectation. The combined limit using both 7 TeV and 8 TeV data is shown.

Tables from CMS-HIG-12-021

Table 1: Determination of the mjj shape and normalization. External constraints are assumed Gaussian.

Process Shape External constraint on normalization
W+jets data/MC Unconstrained
Diboson MC Constrained: (NLO) 89.4 pb 10%
ttbar MC Constrained: (approx. NNLO) 225 pb 7%
single top MC Constrained: (approx. NNLO) 113 pb 5%
Drell-Yan+jets MC Constrained: (NNLO, mll>50GeV) 3504 pb 4.3%
Multi-jet data Constrained: MET fit in data 50% (100%) for electrons (muons)

Table 2: Sources of signal systematics considered in the analysis, with the corresponding magnitude, for the limit extraction.

Source of uncertainty Magnitude
Background mlνjjshape See Fig. 4
Background normalization 0-2%
Higgs boson Cross-section 15-20%
Theory acceptances (PDF) 1-2%
Higgs boson line shape 0-30%
Scale uncertainties from jet binning 4-28%
Luminosity 4.4%
Lepton selection eff. 1-2%
Lepton trigger eff. 1%
Jet energy scale, resolution, and MET <1%
Likelihood selection 10%

Additional plots for public talks

From Analysis Note AN-2012/193

figure label description
mu_jetld_pt.png mu_jetnt_pt.png Figure 2 (left) png pdf, Figure 2 (right) png pdf Comparison of the leading jet (left) and the second jet (right) pT distributions from data and MC for the muon+jets selection.
mu_jetld_eta.png mu_jetnt_eta.png Figure 4 (left) png pdf, Figure 4 (right) png pdf Comparison of the leading jet (left) and the second jet (right) η distributions from data and MC for the muon+jets selection.
mu_W_muon_pt.png Figure 4 (left) png pdf Comparison of the muon pT distributions from data and MC for the muon+jets selection.
mu_W_muon_eta.png Figure 4 (right) png pdf Comparison of the muon η distributions from data and MC for the muon+jets selection.
mu_W_mt.png Figure 5 (left) png pdf Comparison of the distributions from data and MC of the transverse mass of the muon / MET system for the muon+jets selection.
mu_event_met_pfmet.png Figure 5 (right) png pdf Comparison of the distributions from data and MC of the MET for the muon+jets selection.
el_mjj.png Figure 11 png pdf Comparison of the dijet mass (mjj) distributions from data and MC for the electron+jets selection.
mu_charge.png Figure 16 png pdf Comparison of the charge of the muon from data and MC for the muon+jets selection.
el_mlvjj.png Figure 24 (left) png pdf Comparison of the four-body invariant mass from data and MC for the electron+jets selection.

-- KalanandMishra - 21-Jun-2012

Topic attachments
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PDFpdf H200_Mjj_Muon_2jets_Stacked.pdf r1 manage 16.1 K 2012-07-05 - 05:13 KalanandMishra  
PNGpng H200_Mjj_Muon_2jets_Stacked.png r1 manage 19.3 K 2012-07-05 - 05:19 KalanandMishra  
PDFpdf H200_Mlvjj_Muon_2jets_Stacked.pdf r1 manage 16.6 K 2012-07-05 - 05:13 KalanandMishra  
PNGpng H200_Mlvjj_Muon_2jets_Stacked.png r1 manage 41.2 K 2012-07-05 - 05:43 KalanandMishra  
PDFpdf H200_Mlvjj_Muon_2jets_WpJShape.pdf r1 manage 15.6 K 2012-07-05 - 05:13 KalanandMishra  
PNGpng H200_Mlvjj_Muon_2jets_WpJShape.png r1 manage 46.0 K 2012-07-05 - 05:40 KalanandMishra  
PDFpdf H300_Mjj_Muon_2jets_Stacked.pdf r1 manage 17.2 K 2012-07-05 - 05:13 KalanandMishra  
PNGpng H300_Mjj_Muon_2jets_Stacked.png r1 manage 19.4 K 2012-07-05 - 05:19 KalanandMishra  
PDFpdf H300_Mlvjj_Muon_2jets_Stacked.pdf r1 manage 15.1 K 2012-07-05 - 05:13 KalanandMishra  
PNGpng H300_Mlvjj_Muon_2jets_Stacked.png r1 manage 37.9 K 2012-07-05 - 05:43 KalanandMishra  
PDFpdf H300_Mlvjj_Muon_2jets_WpJShape.pdf r1 manage 14.6 K 2012-07-05 - 05:13 KalanandMishra  
PNGpng H300_Mlvjj_Muon_2jets_WpJShape.png r1 manage 43.1 K 2012-07-05 - 05:40 KalanandMishra  
PDFpdf H500_Mjj_Muon_2jets_Stacked.pdf r1 manage 17.6 K 2012-07-05 - 05:13 KalanandMishra  
PNGpng H500_Mjj_Muon_2jets_Stacked.png r1 manage 19.8 K 2012-07-05 - 05:19 KalanandMishra  
PDFpdf H500_Mlvjj_Muon_2jets_Stacked.pdf r1 manage 15.7 K 2012-07-05 - 05:13 KalanandMishra  
PNGpng H500_Mlvjj_Muon_2jets_Stacked.png r1 manage 37.7 K 2012-07-05 - 05:43 KalanandMishra  
PDFpdf H500_Mlvjj_Muon_2jets_WpJShape.pdf r1 manage 15.0 K 2012-07-05 - 05:13 KalanandMishra  
PNGpng H500_Mlvjj_Muon_2jets_WpJShape.png r1 manage 41.6 K 2012-07-05 - 05:40 KalanandMishra  
PDFpdf el_mjj.pdf r1 manage 19.2 K 2012-07-05 - 07:25 KalanandMishra  
PNGpng el_mjj.png r1 manage 35.7 K 2012-07-05 - 07:25 KalanandMishra  
PDFpdf el_mlvjj.pdf r1 manage 18.0 K 2012-07-05 - 07:15 KalanandMishra  
PNGpng el_mlvjj.png r1 manage 41.6 K 2012-07-05 - 07:13 KalanandMishra  
PDFpdf limit_4chan_fullsyst.pdf r1 manage 5.0 K 2012-07-05 - 05:16 KalanandMishra  
PNGpng limit_4chan_fullsyst.png r1 manage 18.2 K 2012-07-05 - 05:19 KalanandMishra  
PDFpdf limit_4chan_fullsyst_asymp.pdf r1 manage 5.1 K 2012-07-05 - 05:16 KalanandMishra  
PNGpng limit_4chan_fullsyst_asymp.png r2 r1 manage 30.0 K 2012-07-05 - 06:03 KalanandMishra  
PDFpdf limit_7and8tevcombined.pdf r1 manage 5.1 K 2012-07-05 - 05:16 KalanandMishra  
PNGpng limit_7and8tevcombined.png r1 manage 28.2 K 2012-07-05 - 05:59 KalanandMishra  
PDFpdf limit_8TeV-ichep2012_8tevsamples_unblinded_fixxsec_jetbinerr.pdf r1 manage 5.0 K 2012-07-05 - 05:16 KalanandMishra  
PDFpdf mu_W_mt.pdf r1 manage 16.9 K 2012-07-05 - 07:15 KalanandMishra  
PNGpng mu_W_mt.png r1 manage 35.1 K 2012-07-05 - 07:13 KalanandMishra  
PDFpdf mu_W_muon_eta.pdf r1 manage 16.6 K 2012-07-05 - 07:15 KalanandMishra  
PNGpng mu_W_muon_eta.png r1 manage 26.0 K 2012-07-05 - 07:13 KalanandMishra  
PDFpdf mu_W_muon_pt.pdf r1 manage 17.1 K 2012-07-05 - 07:15 KalanandMishra  
PNGpng mu_W_muon_pt.png r1 manage 33.3 K 2012-07-05 - 07:13 KalanandMishra  
PDFpdf mu_charge.pdf r1 manage 15.7 K 2012-07-05 - 07:15 KalanandMishra  
PNGpng mu_charge.png r1 manage 25.6 K 2012-07-05 - 07:13 KalanandMishra  
PDFpdf mu_etalvjj.pdf r1 manage 20.3 K 2012-07-05 - 05:16 KalanandMishra  
PNGpng mu_etalvjj.png r2 r1 manage 36.1 K 2012-07-05 - 05:31 KalanandMishra  
PDFpdf mu_event_met_pfmet.pdf r1 manage 17.1 K 2012-07-05 - 07:15 KalanandMishra  
PNGpng mu_event_met_pfmet.png r1 manage 32.3 K 2012-07-05 - 07:13 KalanandMishra  
PDFpdf mu_ha.pdf r1 manage 16.1 K 2012-07-05 - 05:16 KalanandMishra  
PNGpng mu_ha.png r2 r1 manage 29.0 K 2012-07-05 - 05:29 KalanandMishra  
PDFpdf mu_hb.pdf r1 manage 16.0 K 2012-07-05 - 05:16 KalanandMishra  
PNGpng mu_hb.png r2 r1 manage 27.3 K 2012-07-05 - 05:29 KalanandMishra  
PDFpdf mu_hs.pdf r1 manage 18.3 K 2012-07-05 - 05:16 KalanandMishra  
PNGpng mu_hs.png r2 r1 manage 29.4 K 2012-07-05 - 05:29 KalanandMishra  
PDFpdf mu_jetld_eta.pdf r1 manage 16.4 K 2012-07-05 - 07:15 KalanandMishra  
PNGpng mu_jetld_eta.png r1 manage 27.0 K 2012-07-05 - 07:13 KalanandMishra  
PDFpdf mu_jetld_pt.pdf r1 manage 18.4 K 2012-07-05 - 07:15 KalanandMishra  
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PDFpdf mu_jetnt_eta.pdf r1 manage 16.8 K 2012-07-05 - 07:24 KalanandMishra  
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PDFpdf mu_mjj.pdf r1 manage 18.0 K 2012-07-05 - 05:17 KalanandMishra  
PNGpng mu_mjj.png r2 r1 manage 33.1 K 2012-07-05 - 05:24 KalanandMishra  
PDFpdf mu_mlvjj.pdf r1 manage 17.6 K 2012-07-05 - 05:17 KalanandMishra  
PNGpng mu_mlvjj.png r2 r1 manage 37.9 K 2012-07-05 - 05:25 KalanandMishra  
PDFpdf mu_mva2j190.pdf r1 manage 20.1 K 2012-07-05 - 05:17 KalanandMishra  
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PDFpdf mu_mva2j190_signal.pdf r1 manage 21.2 K 2012-07-05 - 05:17 KalanandMishra  
PNGpng mu_mva2j190_signal.png r1 manage 28.9 K 2012-07-05 - 05:20 KalanandMishra  
PDFpdf mu_mva2j500.pdf r1 manage 19.6 K 2012-07-05 - 05:17 KalanandMishra  
PNGpng mu_mva2j500.png r1 manage 22.2 K 2012-07-05 - 05:20 KalanandMishra  
PDFpdf mu_mva2j500_signal.pdf r1 manage 20.1 K 2012-07-05 - 05:17 KalanandMishra  
PNGpng mu_mva2j500_signal.png r1 manage 26.9 K 2012-07-05 - 05:20 KalanandMishra  
PDFpdf mu_phi.pdf r1 manage 17.6 K 2012-07-05 - 05:17 KalanandMishra  
PNGpng mu_phi.png r2 r1 manage 29.3 K 2012-07-05 - 05:26 KalanandMishra  
PDFpdf mu_phib.pdf r1 manage 17.5 K 2012-07-05 - 05:17 KalanandMishra  
PNGpng mu_phib.png r2 r1 manage 29.3 K 2012-07-05 - 05:26 KalanandMishra  
PDFpdf mu_ptlvjj.pdf r1 manage 17.5 K 2012-07-05 - 05:17 KalanandMishra  
PNGpng mu_ptlvjj.png r2 r1 manage 32.7 K 2012-07-05 - 05:31 KalanandMishra  
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