Search for the Standard Model Higgs boson in the H > WW > lvjj decay channel in pp collisions at the LHC

This is a condensed description with plots for the analysis CMS-HIG-12-046

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 12 fb−1 of proton-proton collisions at √s = 8 TeV and 5 fb−1 at √s = 7 TeV collected with the CMS detector at the CERN LHC. 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. The Standard Model Higgs boson is excluded in the mass ranges 215-490 GeV and 525-600 GeV at 95% confidence level, while the median expected exclusion range is 170-585 GeV.

Figures from CMS-HIG-12-046

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 2a(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.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.png Figure 2(bottom right) png,pdf Likelihood discriminant for muon plus 2 jet channel with selection optimized for Higgs mass hypothesis 500 GeV.
H190_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 190 GeV (a), 300 GeV (b), and 500 GeV (c). The fit doesn't include data points in the test region between the vertical lines.
masses.png Figure 4 png,pdf The mjj signal shape for an Higgs mass of 200, 400 and 600 GeV, muon plus 2-jets category. All the distributions are normalized to unity.
H190_Mlvjj_Muon_2jets_WpJShape.png H300_Mlvjj_Muon_2jets_WpJShape.png H500_Mlvjj_Muon_2jets_WpJShape.png Figure 5(a) png pdf, Figure 5(b) png pdf, Figure 5(c) png pdf The distribution of the extrapolated background shape in the signal region for the Higgs mass hypothesis of 190 GeV (a), 300 GeV (b), and 500 GeV (c), for muon 2-jets category. The 500 GeV plot is given in logarithmic scale. 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.
H190_Mlvjj_Muon_2jets_Stacked.png Figure 6(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 190 GeV.
H300_Mlvjj_Muon_2jets_Stacked.png Figure 6(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_log.png Figure 6(c) 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.
H600_Muon_2jets_Signal_Shape.png Figure 7 png pdf The shape variation for the signal four body mass distribution, for a Higgs mass of 600 GeV, muon plus 2 jets category.
limit_4chan_fullsyst_asymp.png Figure 8(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 8(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-12-046

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

Process Shape External constraint on normalization
W+jets data 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
normalization uncertainty <= 2%
W+Jets fit uncertainty shape
inclusive Cross-section 13-15%
Scale uncertainties from jet binning 4-28%
acceptance uncertainty due to pdfs 1-2 %
Luminosity 4.4%
Jet energy scale, resolution, and MET <1%
Lepton selection eff. 2%
Lepton trigger eff. 1%
pile up < 1%
Likelihood selection 10%
Interference shape

Additional plots for public talks

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.
el_jetld_pt.png el_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 electron+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_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.

-- AjayKumar - 06-Nov-2012

Topic attachments
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PDFpdf H190_Mjj_Muon_2jets_Stacked.pdf r2 r1 manage 17.4 K 2012-11-13 - 17:55 LeonardoDiMatteo  
PNGpng H190_Mjj_Muon_2jets_Stacked.png r1 manage 21.1 K 2012-11-13 - 18:03 LeonardoDiMatteo  
PDFpdf H190_Mlvjj_Muon_2jets_Stacked.pdf r2 r1 manage 6.9 K 2012-11-13 - 18:05 LeonardoDiMatteo  
PNGpng H190_Mlvjj_Muon_2jets_Stacked.png r2 r1 manage 42.7 K 2012-11-13 - 18:06 LeonardoDiMatteo  
PDFpdf H190_Mlvjj_Muon_2jets_WpJShape.pdf r1 manage 15.5 K 2012-11-07 - 06:09 AjayKumar  
PNGpng H190_Mlvjj_Muon_2jets_WpJShape.png r1 manage 15.9 K 2012-11-07 - 06:09 AjayKumar  
PDFpdf H300_Mjj_Muon_2jets_Stacked.pdf r2 r1 manage 17.3 K 2012-11-13 - 17:56 LeonardoDiMatteo  
PNGpng H300_Mjj_Muon_2jets_Stacked.png r2 r1 manage 20.8 K 2012-11-13 - 17:56 LeonardoDiMatteo  
PDFpdf H300_Mlvjj_Muon_2jets_Stacked.pdf r2 r1 manage 5.7 K 2012-11-13 - 18:06 LeonardoDiMatteo  
PNGpng H300_Mlvjj_Muon_2jets_Stacked.png r2 r1 manage 39.7 K 2012-11-13 - 18:07 LeonardoDiMatteo  
PDFpdf H300_Mlvjj_Muon_2jets_WpJShape.pdf r1 manage 14.8 K 2012-11-07 - 06:09 AjayKumar  
PNGpng H300_Mlvjj_Muon_2jets_WpJShape.png r1 manage 14.7 K 2012-11-07 - 06:09 AjayKumar  
PDFpdf H500_Mjj_Muon_2jets_Stacked.pdf r2 r1 manage 18.1 K 2012-11-13 - 17:57 LeonardoDiMatteo  
PNGpng H500_Mjj_Muon_2jets_Stacked.png r2 r1 manage 20.6 K 2012-11-13 - 17:57 LeonardoDiMatteo  
PDFpdf H500_Mlvjj_Muon_2jets_Stacked.pdf r2 r1 manage 5.8 K 2012-11-13 - 18:07 LeonardoDiMatteo  
PNGpng H500_Mlvjj_Muon_2jets_Stacked.png r2 r1 manage 39.1 K 2012-11-13 - 18:09 LeonardoDiMatteo  
PDFpdf H500_Mlvjj_Muon_2jets_Stacked_log.pdf r1 manage 16.6 K 2012-11-13 - 18:09 LeonardoDiMatteo  
PNGpng H500_Mlvjj_Muon_2jets_Stacked_log.png r1 manage 19.1 K 2012-11-13 - 18:09 LeonardoDiMatteo  
PDFpdf H500_Mlvjj_Muon_2jets_WpJShape.pdf r1 manage 14.9 K 2012-11-07 - 06:09 AjayKumar  
PNGpng H500_Mlvjj_Muon_2jets_WpJShape.png r1 manage 14.3 K 2012-11-07 - 06:09 AjayKumar  
PDFpdf H500_Mlvjj_Muon_2jets_WpJShape_log.pdf r1 manage 14.9 K 2012-11-13 - 09:54 LeonardoDiMatteo  
PNGpng H500_Mlvjj_Muon_2jets_WpJShape_log.png r1 manage 15.1 K 2012-11-13 - 09:51 LeonardoDiMatteo  
PDFpdf H600_Muon_2jets_Signal_Shape.pdf r1 manage 74.5 K 2012-11-07 - 19:57 AjayKumar  
PNGpng H600_Muon_2jets_Signal_Shape.png r1 manage 11.6 K 2012-11-07 - 19:57 AjayKumar  
PDFpdf el_jetld_pt.pdf r1 manage 19.8 K 2012-11-07 - 08:10 AjayKumar  
PNGpng el_jetld_pt.png r1 manage 26.2 K 2012-11-06 - 18:10 AjayKumar  
PDFpdf el_jetnt_pt.pdf r1 manage 16.7 K 2012-11-07 - 08:10 AjayKumar  
PNGpng el_jetnt_pt.png r1 manage 18.6 K 2012-11-06 - 18:10 AjayKumar  
PDFpdf el_mjj.pdf r1 manage 19.2 K 2012-11-07 - 07:58 AjayKumar  
PNGpng el_mjj.png r1 manage 21.7 K 2012-11-06 - 18:10 AjayKumar  
PDFpdf el_mlvjj.pdf r1 manage 18.0 K 2012-11-07 - 07:58 AjayKumar  
PNGpng el_mlvjj.png r1 manage 27.2 K 2012-11-06 - 18:10 AjayKumar  
PDFpdf limit_4chan_fullsyst_asymp.pdf r2 r1 manage 5.3 K 2012-11-13 - 07:21 UnknownUser  
PNGpng limit_4chan_fullsyst_asymp.png r2 r1 manage 22.7 K 2012-11-13 - 07:22 UnknownUser  
PDFpdf limit_7and8tevcombined.pdf r2 r1 manage 5.2 K 2012-11-13 - 07:24 UnknownUser  
PNGpng limit_7and8tevcombined.png r2 r1 manage 22.7 K 2012-11-13 - 07:23 UnknownUser  
PDFpdf masses.pdf r1 manage 15.0 K 2012-11-13 - 18:13 LeonardoDiMatteo  
PNGpng masses.png r1 manage 14.7 K 2012-11-13 - 18:13 LeonardoDiMatteo  
PDFpdf mu_W_muon_eta.pdf r1 manage 17.6 K 2012-11-07 - 07:58 AjayKumar  
PNGpng mu_W_muon_eta.png r1 manage 18.9 K 2012-11-06 - 18:10 AjayKumar  
PDFpdf mu_W_muon_pt.pdf r1 manage 16.8 K 2012-11-07 - 07:58 AjayKumar  
PNGpng mu_W_muon_pt.png r1 manage 19.5 K 2012-11-06 - 18:10 AjayKumar  
PDFpdf mu_charge.pdf r1 manage 15.2 K 2012-11-07 - 07:24 AjayKumar  
PNGpng mu_charge.png r1 manage 15.8 K 2012-11-07 - 07:24 AjayKumar  
PDFpdf mu_etalvjj.pdf r1 manage 20.2 K 2012-11-07 - 08:47 AjayKumar  
PNGpng mu_etalvjj.png r1 manage 22.4 K 2012-11-06 - 22:30 AjayKumar  
PDFpdf mu_event_met_pfmet.pdf r1 manage 17.1 K 2012-11-07 - 07:58 AjayKumar  
PNGpng mu_event_met_pfmet.png r1 manage 20.9 K 2012-11-06 - 18:10 AjayKumar  
PDFpdf mu_ha.pdf r1 manage 16.2 K 2012-11-07 - 08:45 AjayKumar  
PNGpng mu_ha.png r1 manage 20.9 K 2012-11-06 - 22:30 AjayKumar  
PDFpdf mu_hb.pdf r1 manage 16.1 K 2012-11-07 - 08:10 AjayKumar  
PNGpng mu_hb.png r1 manage 18.6 K 2012-11-06 - 22:30 AjayKumar  
PDFpdf mu_hs.pdf r1 manage 19.7 K 2012-11-07 - 08:10 AjayKumar  
PNGpng mu_hs.png r1 manage 20.7 K 2012-11-06 - 22:30 AjayKumar  
PDFpdf mu_jetld_pt.pdf r1 manage 18.3 K 2012-11-07 - 08:10 AjayKumar  
PNGpng mu_jetld_pt.png r1 manage 25.8 K 2012-11-07 - 08:10 AjayKumar  
PDFpdf mu_jetnt_pt.pdf r1 manage 16.9 K 2012-11-07 - 08:10 AjayKumar  
PNGpng mu_jetnt_pt.png r1 manage 19.8 K 2012-11-07 - 08:10 AjayKumar  
PDFpdf mu_mjj.pdf r1 manage 18.4 K 2012-11-07 - 08:15 AjayKumar  
PNGpng mu_mjj.png r1 manage 24.7 K 2012-11-06 - 22:30 AjayKumar  
PDFpdf mu_mlvjj.pdf r1 manage 17.6 K 2012-11-07 - 08:15 AjayKumar  
PNGpng mu_mlvjj.png r1 manage 25.5 K 2012-11-06 - 22:30 AjayKumar  
PDFpdf mu_mva2j190.pdf r1 manage 20.5 K 2012-11-07 - 07:37 AjayKumar  
PNGpng mu_mva2j190.png r2 r1 manage 27.8 K 2012-11-08 - 00:44 UnknownUser  
PDFpdf mu_mva2j500.pdf r1 manage 19.9 K 2012-11-07 - 07:37 AjayKumar  
PNGpng mu_mva2j500.png r2 r1 manage 27.3 K 2012-11-08 - 00:45 UnknownUser  
PDFpdf mu_phi.pdf r1 manage 17.5 K 2012-11-07 - 08:44 AjayKumar  
PNGpng mu_phi.png r1 manage 18.6 K 2012-11-06 - 22:30 AjayKumar  
PDFpdf mu_phib.pdf r1 manage 17.4 K 2012-11-07 - 08:44 AjayKumar  
PNGpng mu_phib.png r1 manage 18.6 K 2012-11-06 - 22:30 AjayKumar  
PDFpdf mu_ptlvjj.pdf r1 manage 17.5 K 2012-11-07 - 08:47 AjayKumar  
PNGpng mu_ptlvjj.png r1 manage 21.6 K 2012-11-06 - 22:30 AjayKumar  
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