Search for the Standard Model Higgs Boson Decaying to Bottom Quarks and Produced in Association with a W or a Z Boson
This is a condensed description with plots for the analysis CMS-HIG-11-012.Abstract
A search for the standard model Higgs boson is performed in a data sample corresponding to an integrated luminosity of 1.1 /fb, recorded by the CMS detector in proton-proton collisions at the LHC with a 7 TeV center-of-mass energy. The following modes are studied: W(μν)H, W(eν)H, Z(μμ)H, Z(ee)H and Z(νν)H, with the Higgs decaying to bbbar pairs. 95% C.L. upper limits on the VH production cross section are derived for a Higgs mass between 110 and 135 GeV.Main Results
BDT Analysis
Higgs Cross section / SM Higgs Cross section limits evaluated with CLs method.| Mass (GeV) | Observed | Expected | 68% Prob. Band | 95% Prob. Band |
|---|---|---|---|---|
| 110 | 7.96 | 5.77 | [4.32, 8.98] | [3.32, 14.0] |
| 115 | 8.32 | 5.70 | [4.21, 8.78] | [3.24, 13.7] |
| 120 | 9.51 | 7.75 | [5.84, 12.0] | [4.46, 18.8] |
| 125 | 15.3 | 9.58 | [6.98, 14.7] | [5.88, 22.5] |
| 130 | 16.3 | 11.0 | [8.37, 16.8] | [7.04, 26.1] |
| 135 | 22.6 | 14.4 | [10.5, 22.7] | [9.09, 34.7] |
M(jj) Analysis
Higgs Cross section / SM Higgs Cross section limits evaluated with CLs method.| Mass (GeV) | Observed | Expected | 68% Prob. Band | 95% Prob. Band |
|---|---|---|---|---|
| 110 | 8.25 | 6.42 | [4.66, 9.74] | [3.62, 15.1] |
| 115 | 11.3 | 5.97 | [4.42, 9.50] | [4.01, 14.6] |
| 120 | 11.4 | 8.14 | [5.77, 12.4] | [4.47, 19.2] |
| 125 | 11.6 | 8.63 | [6.22, 13.6] | [5.30, 20.6] |
| 130 | 14.1 | 12.2 | [9.07, 18.5] | [6.90, 28.8] |
| 135 | 19.9 | 15.0 | [11.4, 22.6] | [8.26, 33.8] |
Figures
All public plots and tables from this analysis are collected here. Click on a figure to enlarge it, then double click to go to normal size again.| FIGURE | FILES | Description |
|---|
Results
 |
png, gif, pdf | 95% CL limits on the VH(bb) production cross section divided by the standard model predicted cross section computed with the results of the BDT analysis using the LHC CLs method. Shown are the median expected limit (dashed), one- (green) and two-sigma (yellow) bands, and the observed limits (solid with points). |
 |
png, gif, pdf | 95% CL limits on the VH(bb) production cross section divided by the standard model predicted cross section computed with the results of the M(jj) analysis using the LHC CLs method. Shown are the median expected limit (dashed), one- (green) and two-sigma (yellow) bands, and the observed limits (solid with points). |
Signal Region BDT Plots
 |
png, gif, pdf | Distribution of the BDT output for W(μν)H(bb) events after all selection criteria are applied except for the final cut on the BDT itself. The signal plot (black histogram) is for MH = 115 GeV. |
 |
png, gif, pdf | Distribution of the BDT output for W(eν)H(bb) events after all selection criteria are applied except for the final cut on the BDT itself. The signal plot (black histogram) is for MH = 115 GeV. |
 |
png, gif, pdf | Distribution of the BDT output for Z(μμ)H(bb) events after all selection criteria are applied except for the final cut on the BDT itself. The signal plot (black histogram) is for MH = 115 GeV. |
 |
png, gif, pdf | Distribution of the BDT output for Z(ee)H(bb) events after all selection criteria are applied except for the final cut on the BDT itself. The signal plot (black histogram) is for MH = 115 GeV. |
 |
png, gif, pdf | Distribution of the BDT output for Z(νν)H(bb) events after all selection criteria are applied except for the final cut on the BDT itself. The signal plot (black histogram) is for MH = 115 GeV. |
Signal Region M(jj) Plots
 |
png, gif, pdf | Distribution of the Mjj output for W(μν)H(bb) events after all selection criteria are applied except for the final cut on the Mjj itself. The signal plot (black histogram) is for MH = 115 GeV. |
 |
png, gif, pdf | Distribution of the Mjj output for W(eν)H(bb) events after all selection criteria are applied except for the final cut on the Mjj itself. The signal plot (black histogram) is for MH = 115 GeV. |
 |
png, gif, pdf | Distribution of the Mjj output for Z(μμ)H(bb) events after all selection criteria are applied except for the final cut on the Mjj itself. The signal plot (black histogram) is for MH = 115 GeV. |
 |
png, gif, pdf | Distribution of the Mjj output for Z(ee)H(bb) events after all selection criteria are applied except for the final cut on the Mjj itself. The signal plot (black histogram) is for MH = 115 GeV. |
 |
png, gif, pdf | Distribution of the Mjj output for Z(νν)H(bb) events after all selection criteria are applied except for the final cut on the Mjj itself. The signal plot (black histogram) is for MH = 115 GeV. |
Background Control Regions
 |
png, gif, pdf | Distribution of dijet pT in the W + bb control region for W(μν)H(bb). |
 |
png, gif, pdf | Distribution of dijet pT in the W + bb control region for W(e;ν)H(bb). |
 |
png, gif, pdf | Distribution of missing energy in the Zmumu + jets control region for Z(νν)H(bb), where the muon energy has been removed from the events. |
 |
png, gif, pdf | Distribution of dijet pT in the W + udscg control region for Z(νν)H(bb). |
 |
png, gif, pdf | Distribution of dijet invariant mass in the ttbar control region for Z(μμ)H(bb). |
 |
png, gif, pdf | Distribution of b-tag discriminator output for the second-best b-tag in the Higgs candidate for the Z + bb control region in Z(ee)H(bb). |
| I | Attachment | History | Action | Size | Date | Who | Comment |
|---|---|---|---|---|---|---|---|
 gif |
BDTLimits.gif | r1 | manage | 57.8 K | 2011-08-21 - 03:17 | JimOlsen | BDT Limits |
 pdf |
BDTLimits.pdf | r1 | manage | 14.8 K | 2011-08-21 - 03:18 | JimOlsen | |
 png |
BDTLimits.png | r1 | manage | 106.2 K | 2011-08-21 - 03:15 | JimOlsen | BDT limits |
| gif |
MjjLimits.gif | r1 | manage | 57.4 K | 2011-08-21 - 03:21 | JimOlsen | Mjj limits |
| pdf |
MjjLimits.pdf | r1 | manage | 14.8 K | 2011-08-21 - 03:22 | JimOlsen | Mjj limits |
| png |
MjjLimits.png | r1 | manage | 125.9 K | 2011-08-21 - 03:21 | JimOlsen | Mjj limits |
| gif |
WenHBDTLog.gif | r1 | manage | 89.3 K | 2011-08-21 - 04:06 | JimOlsen | BDT output for W(eν)H after all cuts |
| pdf |
WenHBDTLog.pdf | r1 | manage | 16.4 K | 2011-08-21 - 04:07 | JimOlsen | BDT output for W(eν)H after all cuts |
| png |
WenHBDTLog.png | r1 | manage | 147.7 K | 2011-08-21 - 03:53 | JimOlsen | BDT output for W(eν)H after all cuts |
| gif |
WenHMjjLog.gif | r1 | manage | 84.0 K | 2011-08-21 - 04:41 | JimOlsen | M(jj) distribution for W(eν)H after all cuts |
| pdf |
WenHMjjLog.pdf | r1 | manage | 15.5 K | 2011-08-21 - 04:41 | JimOlsen | M(jj) distribution for W(eν)H after all cuts |
| png |
WenHMjjLog.png | r1 | manage | 159.3 K | 2011-08-21 - 04:41 | JimOlsen | M(jj) distribution for W(eν)H after all cuts |
| gif |
WenHWbbPt.gif | r1 | manage | 90.6 K | 2011-08-21 - 05:23 | JimOlsen | Dijet pt for W(eν)H candidates in the W + bb control region |
| pdf |
WenHWbbPt.pdf | r1 | manage | 16.2 K | 2011-08-21 - 05:24 | JimOlsen | Dijet pt for W(eν)H candidates in the W + bb control region |
| png |
WenHWbbPt.png | r1 | manage | 166.1 K | 2011-08-21 - 05:23 | JimOlsen | Dijet pt for W(eν)H candidates in the W + bb control region |
| gif |
WenHWudscgPt.gif | r1 | manage | 97.6 K | 2011-08-21 - 05:21 | JimOlsen | Dijet pt for W(eν)H candidates in the W + udscg control region |
| pdf |
WenHWudscgPt.pdf | r1 | manage | 17.0 K | 2011-08-21 - 05:21 | JimOlsen | Dijet pt for W(eν)H candidates in the W + udscg control region |
| png |
WenHWudscgPt.png | r1 | manage | 176.1 K | 2011-08-21 - 05:19 | JimOlsen | Dijet pt for W(eν)H candidates in the W + udscg control region |
| gif |
WmnHBDTLog.gif | r1 | manage | 90.2 K | 2011-08-21 - 03:51 | JimOlsen | BDT output for W(μν)H after all cuts |
| pdf |
WmnHBDTLog.pdf | r1 | manage | 16.8 K | 2011-08-21 - 03:52 | JimOlsen | BDT output for W(μν)H after all cuts |
| png |
WmnHBDTLog.png | r1 | manage | 147.2 K | 2011-08-21 - 03:50 | JimOlsen | BDT output for W(μν)H after all cuts |
| gif |
WmnHMjjLog.gif | r1 | manage | 89.5 K | 2011-08-21 - 04:37 | JimOlsen | M(jj) distribution for W(μν)H after all cuts |
| pdf |
WmnHMjjLog.pdf | r1 | manage | 15.5 K | 2011-08-21 - 04:38 | JimOlsen | M(jj) distribution for W(μν)H after all cuts |
| png |
WmnHMjjLog.png | r1 | manage | 159.0 K | 2011-08-21 - 04:35 | JimOlsen | M(jj) distribution for W(μν)H after all cuts |
| gif |
WmnHTTbarPt.gif | r1 | manage | 83.4 K | 2011-08-21 - 05:22 | JimOlsen | Dijet pt for W(μν)H candidates in the ttbar control region |
| pdf |
WmnHTTbarPt.pdf | r1 | manage | 19.4 K | 2011-08-21 - 05:22 | JimOlsen | Dijet pt for W(μν)H candidates in the ttbar control region |
| png |
WmnHTTbarPt.png | r1 | manage | 174.0 K | 2011-08-21 - 05:21 | JimOlsen | Dijet pt for W(μν)H candidates in the ttbar control region |
| gif |
ZeeHBDTLog.gif | r1 | manage | 148.0 K | 2011-08-21 - 04:16 | JimOlsen | BDT output for Z(ee)H after all cuts |
| pdf |
ZeeHBDTLog.pdf | r1 | manage | 16.5 K | 2011-08-21 - 04:17 | JimOlsen | BDT output for Z(ee)H after all cuts |
| png |
ZeeHBDTLog.png | r1 | manage | 151.7 K | 2011-08-21 - 04:16 | JimOlsen | BDT output for Z(ee)H after all cuts |
| gif |
ZeeHMjjLog.gif | r1 | manage | 121.4 K | 2011-08-21 - 04:52 | JimOlsen | M(jj) distribution for Z(ee)H after all cuts |
| pdf |
ZeeHMjjLog.pdf | r1 | manage | 15.3 K | 2011-08-21 - 04:53 | JimOlsen | M(jj) distribution for Z(ee)H after all cuts |
| png |
ZeeHMjjLog.png | r1 | manage | 161.1 K | 2011-08-21 - 04:52 | JimOlsen | M(jj) distribution for Z(ee)H after all cuts |
| gif |
ZeeHTTbarPt.gif | r1 | manage | 70.2 K | 2011-08-21 - 05:27 | JimOlsen | Dijet pt for Z(ee)H candidates in the ttbar control region |
| pdf |
ZeeHTTbarPt.pdf | r1 | manage | 15.9 K | 2011-08-21 - 05:28 | JimOlsen | Dijet pt for Z(ee)H candidates in the ttbar control region |
| png |
ZeeHTTbarPt.png | r1 | manage | 155.0 K | 2011-08-21 - 05:27 | JimOlsen | Dijet pt for Z(ee)H candidates in the ttbar control region |
| gif |
ZmmHBDTLog.gif | r1 | manage | 153.1 K | 2011-08-21 - 04:15 | JimOlsen | BDT output for Z(μμ)H after all cuts |
| pdf |
ZmmHBDTLog.pdf | r1 | manage | 17.1 K | 2011-08-21 - 04:15 | JimOlsen | BDT output for Z(μμ)H after all cuts |
| png |
ZmmHBDTLog.png | r1 | manage | 166.2 K | 2011-08-21 - 04:47 | JimOlsen | BDT output for Z(μμ)H after all cuts |
| gif |
ZmmHMjjLog.gif | r1 | manage | 105.3 K | 2011-08-21 - 04:43 | JimOlsen | M(jj) distribution for Z(μμ)H after all cuts |
| pdf |
ZmmHMjjLog.pdf | r1 | manage | 15.5 K | 2011-08-21 - 04:50 | JimOlsen | M(jj) distribution for Z(μμ)H after all cuts |
| png |
ZmmHMjjLog.png | r1 | manage | 159.1 K | 2011-08-21 - 04:49 | JimOlsen | M(jj) distribution for Z(μμ)H after all cuts |
| gif |
ZmmHZbbPt.gif | r1 | manage | 71.6 K | 2011-08-21 - 05:28 | JimOlsen | Dijet pt for Z(μμ)H candidates in the Z + bb control region |
| pdf |
ZmmHZbbPt.pdf | r1 | manage | 15.1 K | 2011-08-21 - 05:29 | JimOlsen | Dijet pt for Z(μμ)H candidates in the Z + bb control region |
| png |
ZmmHZbbPt.png | r1 | manage | 151.7 K | 2011-08-21 - 05:28 | JimOlsen | Dijet pt for Z(μμ)H candidates in the Z + bb control region |
| gif |
ZmmHZudscgPt.gif | r1 | manage | 94.1 K | 2011-08-21 - 05:25 | JimOlsen | Dijet pt for Z(μμ)H candidates in the Z + udscg control region |
| pdf |
ZmmHZudscgPt.pdf | r1 | manage | 15.6 K | 2011-08-21 - 05:25 | JimOlsen | Dijet pt for Z(μμ)H candidates in the Z + udscg control region |
| png |
ZmmHZudscgPt.png | r1 | manage | 150.9 K | 2011-08-21 - 05:24 | JimOlsen | Dijet pt for Z(μμ)H candidates in the Z + udscg control region |
| gif |
ZnnHBDTLog.gif | r1 | manage | 131.8 K | 2011-08-21 - 04:17 | JimOlsen | BDT output for Z(νν)H after all cuts |
| pdf |
ZnnHBDTLog.pdf | r1 | manage | 19.3 K | 2011-08-21 - 04:17 | JimOlsen | BDT output for Z(νν)H after all cuts |
| png |
ZnnHBDTLog.png | r1 | manage | 161.8 K | 2011-08-21 - 04:51 | JimOlsen | BDT output for Z(νν)H after all cuts |
| gif |
ZnnHMjjLog.gif | r1 | manage | 113.6 K | 2011-08-21 - 04:53 | JimOlsen | M(jj) distribution for Z(νν)H after all cuts |
| pdf |
ZnnHMjjLog.pdf | r1 | manage | 16.0 K | 2011-08-21 - 04:54 | JimOlsen | M(jj) distribution for Z(νν)H after all cuts |
| png |
ZnnHMjjLog.png | r1 | manage | 163.0 K | 2011-08-21 - 04:53 | JimOlsen | M(jj) distribution for Z(νν)H after all cuts |
| gif |
ZnnHTTbarMjj.gif | r1 | manage | 68.7 K | 2011-08-21 - 06:00 | JimOlsen | Distribution of dijet mass for Z(νν)H candidates in the ttbar control region |
| pdf |
ZnnHTTbarMjj.pdf | r1 | manage | 15.4 K | 2011-08-21 - 06:00 | JimOlsen | Distribution of dijet mass for Z(νν)H candidates in the ttbar control region |
| png |
ZnnHTTbarMjj.png | r1 | manage | 155.1 K | 2011-08-21 - 05:59 | JimOlsen | Distribution of dijet mass for Z(νν)H candidates in the ttbar control region |
| gif |
ZnnHWjetsMjj.gif | r1 | manage | 88.7 K | 2011-08-21 - 06:03 | JimOlsen | Distribution of dijet mass for Z(νν)H candidates in the W + jets control region |
| pdf |
ZnnHWjetsMjj.pdf | r1 | manage | 17.6 K | 2011-08-21 - 06:04 | JimOlsen | Distribution of dijet mass for Z(νν)H candidates in the W + jets control region |
| png |
ZnnHWjetsMjj.png | r1 | manage | 157.4 K | 2011-08-21 - 06:03 | JimOlsen | Distribution of dijet mass for Z(νν)H candidates in the W + jets control region |
| gif |
ZnnHZudscgMET.gif | r1 | manage | 68.6 K | 2011-08-21 - 05:56 | JimOlsen | Distribution of missing transverse energy in Z(μμ) + jets events where the muons are removed. |
| pdf |
ZnnHZudscgMET.pdf | r1 | manage | 15.9 K | 2011-08-21 - 05:57 | JimOlsen | Distribution of missing transverse energy in Z(μμ) + jets events where the muons are removed. |
| png |
ZnnHZudscgMET.png | r1 | manage | 136.2 K | 2011-08-21 - 05:53 | JimOlsen | Distribution of missing transverse energy in Z(μμ) + jets events where the muons are removed. |
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