Search for the standard model Higgs boson produced in association with W or Z bosons, and decaying to bottom quarks

VH_Cartoon.png Table of contents:

Main Results

A search for the standard model Higgs boson (H) decaying to bb when produced in association with a weak vector boson (V) is reported for the following modes: W(μν)H, W(eν)H, Z(μμ)H, Z(ee)H and Z(νν)H. The search is performed in a data sample corresponding to an integrated luminosity of 5.0 fb−1, recorded by the CMS detector in proton-proton collisions at the LHC with a center-of-mass energy of 7 TeV during 2011, and in a data sample of up to 12.1 fb−1 of 8 TeV collisions during 2012. Upper limits, at the 95% confidence level, on the VH production cross section times the H → bb branching ratio, with respect to the expectations for a standard model Higgs boson, are derived for a Higgs boson in the mass range 110–135 GeV. In this range, the observed upper limits vary from 1.0 to 4.7 times the standard model prediction; the corresponding expected limits vary from 0.9 to 1.9. At a Higgs boson mass of 125 GeV the observed limit is 2.5 and the expected limit is 1.2. The excess of observed events is 2.2 standard deviations from what is expected from background alone, and is consistent with the standard model prediction for Higgs boson production.

Public Note:

http://cds.cern.ch/record/1493618/files/HIG-12-044-pas.pdf

Public plots recommended for conferences:

limitVHbb_PAS_final.png

limitVHbb_PAS_final.pdf

Expected and observed 95% CL upper limits on the product of the VH production cross section times the H → bb branching ratio, with respect to the expectations for a standard model Higgs boson. The median expected limit and the 1- and 2-σ bands are obtained with the LHC CLs method as implemented in RooStats, as are the observed limits at each mass point. The limits are combined for the 2011 7 TeV and the 2012 8 TeV data.

pvalueVHbb_PAS_final.png

pvalueVHbb_PAS_final.pdf

p-values for background fluctuations to account for the observed excess of events in the data.

ccc_channel_7p8TeV-green.png

ccc_channel_7p8TeV-green.pdf

The most likely value for the production cross section for a 125 GeV standard Higgs boson, relative to the standard model cross section, for each mode and for all modes combined.

mBB_VHHighPt7p8TeV.png

mBB_VHHighPt7p8TeV.pdf

Dijet invariant mass distribution, combined for all channels, for the high pT(V) bin, for events that pass an event selection optimized for this variable.

mBB_VHHighPt7p8TeV_sub_MCUncert.png

mBB_VHHighPt7p8TeV_sub_MCUncert.pdf

Same distribution with all backgrounds, except dibosons, subtracted. The solid histograms for the back- grounds and the signal are summed cumulatively. The line histogram for signal and for VV backgrounds are also shown superimposed. The data is represented by points with error bars.

VH_Cartoon.png

VH_Cartoon.pdf

VH cartoon

Additional plots

BDT_Zll_ZmmLowPt_PostFit_s.png

BDT_Zll_ZmmLowPt_PostFit_s.pdf

BDT output distributions for Z(μμ)H in the low pT(V) bin for data (points with errors), all backgrounds, and signal, after all selection criteria have been applied.

BDT_Zll_ZmmHighPt_PostFit_s.png

BDT_Zll_ZmmHighPt_PostFit_s.pdf

BDT output distributions for Z(μμ)H in the high pT(V) bin for data (points with errors), all backgrounds, and signal, after all selection criteria have been applied.

BDT_Zll_ZeeLowPt_PostFit_s.png

BDT_Zll_ZeeLowPt_PostFit_s.pdf

BDT output distributions for Z(ee)H in the low pT(V) bin for data (points with errors), all backgrounds, and signal, after all selection criteria have been applied.

BDT_Zll_ZeeHighPt_PostFit_s.png

BDT_Zll_ZeeHighPt_PostFit_s.pdf

BDT output distributions for Z(ee)H in the high pT(V) bin for data (points with errors), all backgrounds, and signal, after all selection criteria have been applied.

BDT_Wln_WmnLowPt_PostFit_s.png

BDT_Wln_WmnLowPt_PostFit_s.pdf

BDT output distributions for W(μν)H in the low pT(V) bin for data (points with errors), all backgrounds, and signal, after all selection criteria have been applied.

BDT_Wln_WmnHighPt_PostFit_s.png

BDT_Wln_WmnHighPt_PostFit_s.pdf

BDT output distributions for W(μν)H in the high pT(V) bin for data (points with errors), all backgrounds, and signal, after all selection criteria have been applied.

BDT_Wln_WmnLowCSV_PostFit_s.png

BDT_Wln_WmnLowCSV_PostFit_s.pdf

BDT output distributions for W(μν)H in the high pT(V) bin with looser b-tagging for data (points with errors), all backgrounds, and signal, after all selection criteria have been applied.

BDT_Wln_WenLowPt_PostFit_s.png

BDT_Wln_WenLowPt_PostFit_s.pdf

BDT output distributions for W(eν)H in the low pT(V) bin for data (points with errors), all backgrounds, and signal, after all selection criteria have been applied.

BDT_Wln_WenHighPt_PostFit_s.png

BDT_Wln_WenHighPt_PostFit_s.pdf

BDT output distributions for W(eν)H in the high pT(V) bin for data (points with errors), all backgrounds, and signal, after all selection criteria have been applied.

BDT_Wln_WenLowCSV_PostFit_s.png

BDT_Wln_WenLowCSV_PostFit_s.pdf

BDT output distributions for W(eν)H in the high pT(V) bin with looser b-tagging for data (points with errors), all backgrounds, and signal, after all selection criteria have been applied.

BDT_Znn_ZnnLowPt_PostFit_s.png

BDT_Znn_ZnnLowPt_PostFit_s.pdf

BDT output distributions for Z(νν)H in the low pT(V) bin for data (points with errors), all backgrounds, and signal, after all selection criteria have been applied.

BDT_Znn_ZnnHighPt_PostFit_s.png

BDT_Znn_ZnnHighPt_PostFit_s.pdf

BDT output distributions for Z(νν)H in the high pT(V) bin for data (points with errors), all backgrounds, and signal, after all selection criteria have been applied.

BDT_Znn_ZnnLowCSV_PostFit_s.png

BDT_Znn_ZnnLowCSV_PostFit_s.pdf

BDT output distributions for Z(νν)H in the high pT(V) bin with looser b-tagging for data (points with errors), all backgrounds, and signal, after all selection criteria have been applied.

ZLight_HighPt_Zmm_BDT8_RTight.png

ZLight_HighPt_Zmm_BDT8_RTight.pdf

BDT output distribution for ZllH in the high pT(V) bin for data (points with errors), all backgrounds and signal, after all selection criteria have been applied.

Additional plots (regression)

ZllH_Regression_Semi.png

ZllH_Regression_Semi.pdf

Improvement of the higgs mass resolution in simulated events in cases where at least one of the Higgs jets undergoes a semileptonic b-decay.

ZllH_Regression_Zbb_Data.png

ZllH_Regression_Zbb_Data.pdf

Validation of the regression performance on data using the Z and jet balance in a Z+bb enriched selection on 8 TeV data.

MtopShapes_Wmunu_Data.png

MtopShapes_Wmunu_Data.pdf

Validation of the regression performance on 8 TeV data using the reconstructed top quark mass in a sample of events selected to enhance single top production. Shapes are shown before and after correction from the application of the regression. The top quark candidate is reconstructed using the b-jet of highest CSV discriminant.

Additional plots (control regions)

ZllH_higgsCut_TTbar_met_Zll.png

ZllH_higgsCut_TTbar_met_Zll.pdf

Transverse missing energy distribution for ZllH in the low T(V) bin in the dijet mass sideband, control region where the scale factors for the backgrounds are estimated.

ZeeH_higgsCuts_Data_bbPt_Zlight_pTjj_Zee.png

ZeeH_higgsCuts_Data_bbPt_Zlight_pTjj_Zee.pdf

Transverse momentum of the dijet system in a control region enriched in Z + light flavor quark jets, where the Z decays in to electrons.

ZmmH_higgsCuts_Data_zPt_Zlight_pTV_Zmm.png

ZmmH_higgsCuts_Data_zPt_Zlight_pTV_Zmm.pdf

Projection in the tranverse plane of the Z momentum in a control region enriched in Z + light flavor quark jets, where the Z decays in to muons.

ZnnH_Zlight_csvmax.png

ZnnH_Zlight_csvmax.pdf

Value of the maximum b-tagger between the jets form which the Higgs candidate is formed, in a control region enriched in Z + light flavor quark jets, where the Z decays in to neutrinos.

ZnnH_Zlight_csvmin.png

ZnnH_Zlight_csvmin.pdf

Value of the minimum b-tagger between the jets from which the Higgs candidate is formed, in a control region enriched in Z + light flavor quark jets, where the Z decays in to neutrinos.


  • Wenu_CSV2_Mjj.png:
    Wenu_CSV2_Mjj.png

  • Wenu_dPhiVH_Mjj.png:
    Wenu_dPhiVH_Mjj.png

  • Wenu_ptW_Mjj.png:
    Wenu_ptW_Mjj.png

  • Wenu-Wbb2-BDT-lin_8TeV_1.png:
    Wenu-Wbb2-BDT-lin_8TeV_1.png

  • Wmnu-Wbb2-MtW-lin_8TeV_1.png:
    Wmnu-Wbb2-MtW-lin_8TeV_1.png

  • Wmnu-Wbb2-ptjj-lin_8TeV_1.png:
    Wmnu-Wbb2-ptjj-lin_8TeV_1.png

  • Wmnu-Wudscg-pfMET-lin_8TeV_1.png:
    Wmnu-Wudscg-pfMET-lin_8TeV_1.png

  • Wmnu-Wudscg-pfMETSig-lin_8TeV_1.png:
    Wmnu-Wudscg-pfMETSig-lin_8TeV_1.png

  • Wmunu_BDT_Mjj.png:
    Wmunu_BDT_Mjj.png

  • Wmunu_dEtajj_Mjj.png:
    Wmunu_dEtajj_Mjj.png

  • Wmunu_ptjj_Mjj.png:
    Wmunu_ptjj_Mjj.png
Topic attachments
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PNGpng BDT_Wln_WenHighPt_PostFit_s.png r1 manage 431.3 K 2012-11-13 - 01:07 JiaFuLow  
PDFpdf BDT_Wln_WenLowCSV_PostFit_s.pdf r1 manage 24.8 K 2012-11-13 - 01:07 JiaFuLow  
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PDFpdf BDT_Wln_WenLowPt_PostFit_s.pdf r1 manage 24.6 K 2012-11-13 - 01:07 JiaFuLow  
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PDFpdf BDT_Znn_ZnnHighPt_PostFit_s.pdf r1 manage 21.5 K 2012-11-13 - 01:06 JiaFuLow  
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PDFpdf MtopShapes_Wmunu_Data.pdf r1 manage 18.7 K 2012-11-13 - 14:34 MichaelMooney  
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PDFpdf VH_Cartoon.pdf r1 manage 78.8 K 2012-11-09 - 13:49 PierluigiBortignon VH_Cartoon
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PNGpng Wenu-Wbb2-BDT-lin_8TeV_1.png r1 manage 20.3 K 2013-03-10 - 19:28 PierluigiBortignon  
PNGpng Wenu_CSV2_Mjj.png r1 manage 57.2 K 2013-03-10 - 19:28 PierluigiBortignon  
PNGpng Wenu_dPhiVH_Mjj.png r1 manage 49.0 K 2013-03-10 - 19:28 PierluigiBortignon  
PNGpng Wenu_ptW_Mjj.png r1 manage 49.7 K 2013-03-10 - 19:28 PierluigiBortignon  
PNGpng Wmnu-Wbb2-MtW-lin_8TeV_1.png r1 manage 23.7 K 2013-03-10 - 19:28 PierluigiBortignon  
PNGpng Wmnu-Wbb2-ptjj-lin_8TeV_1.png r1 manage 19.0 K 2013-03-10 - 19:28 PierluigiBortignon  
PNGpng Wmnu-Wudscg-pfMET-lin_8TeV_1.png r1 manage 20.6 K 2013-03-10 - 19:28 PierluigiBortignon  
PNGpng Wmnu-Wudscg-pfMETSig-lin_8TeV_1.png r1 manage 20.5 K 2013-03-10 - 19:28 PierluigiBortignon  
PNGpng Wmunu_BDT_Mjj.png r1 manage 50.0 K 2013-03-10 - 19:28 PierluigiBortignon  
PNGpng Wmunu_dEtajj_Mjj.png r1 manage 43.1 K 2013-03-10 - 19:28 PierluigiBortignon  
PNGpng Wmunu_ptjj_Mjj.png r1 manage 47.3 K 2013-03-10 - 19:29 PierluigiBortignon  
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PDFpdf ZllH_Regression_Semi.pdf r1 manage 15.3 K 2012-11-13 - 10:02 NiklasMohr  
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PDFpdf ZmmH_higgsCuts_Data_zPt_Zlight_pTV_Zmm.pdf r1 manage 23.6 K 2013-03-10 - 19:29 PierluigiBortignon  
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PDFpdf ZnnH_Zlight_csvmin.pdf r1 manage 20.0 K 2013-03-10 - 19:29 PierluigiBortignon  
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PDFpdf ccc_channel_7p8TeV-green.pdf r1 manage 13.3 K 2012-11-13 - 01:05 JiaFuLow  
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PDFpdf ccc_channel_7p8TeV.pdf r1 manage 13.5 K 2012-11-09 - 11:58 PierluigiBortignon 7+8TeV signal strength for the three channel separately.
PNGpng ccc_channel_7p8TeV.png r1 manage 63.4 K 2012-11-09 - 11:58 PierluigiBortignon 7+8TeV signal strength for the three channel separately.
PDFpdf limitVHbb_PAS_final.pdf r1 manage 14.7 K 2012-11-13 - 01:05 JiaFuLow  
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PDFpdf limitsVHbb_HCP_7plus8TeV_decor.pdf r1 manage 14.7 K 2012-11-09 - 11:07 PierluigiBortignon 7+8 TeV Limit plot with signal injection
PNGpng limitsVHbb_HCP_7plus8TeV_decor.png r3 r2 r1 manage 59.7 K 2012-11-09 - 11:45 PierluigiBortignon 7+8 TeV Limit plot with signal injection
PDFpdf mBB_VHHighPt7p8TeV.pdf r1 manage 21.4 K 2012-11-09 - 11:54 PierluigiBortignon Hight-Pt category dijet 7+8TeV mass distribution. All channels combined.
PNGpng mBB_VHHighPt7p8TeV.png r1 manage 84.5 K 2012-11-09 - 11:54 PierluigiBortignon Hight-Pt category dijet 7+8TeV mass distribution. All channels combined.
PDFpdf mBB_VHHighPt7p8TeV_sub_MCUncert.pdf r1 manage 16.8 K 2012-11-09 - 11:55 PierluigiBortignon Hight-Pt category dijet 7+8TeV mass distribution background subtracted. All channels combined.
PNGpng mBB_VHHighPt7p8TeV_sub_MCUncert.png r1 manage 64.3 K 2012-11-09 - 11:56 PierluigiBortignon Hight-Pt category dijet 7+8TeV mass distribution background subtracted. All channels combined.
PDFpdf pvalueHCP_decor.pdf r1 manage 14.6 K 2012-11-09 - 11:08 PierluigiBortignon 7+8 TeV p-value plot
PNGpng pvalueHCP_decor.png r4 r3 r2 r1 manage 48.3 K 2012-11-09 - 11:45 PierluigiBortignon 7+8 TeV p-value plot
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PNGpng pvalueVHbb_PAS_final.png r1 manage 275.5 K 2012-11-13 - 01:05 JiaFuLow  
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Topic revision: r12 - 2013-03-25 - NiklasMohr
 
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