Search for the Higgs boson in the H → ZZ → 2l2ν channel in 4.6 fb−1

This is a condensed description with plots for the analysis arXiv:1202.3478

Abstract

A search for the standard model Higgs boson in the H -> ZZ -> 2l2nu decay channel, where l = e or mu, in pp collisions at a center-of-mass energy of 7 TeV is presented. The data were collected at the LHC, with the CMS detector, and correspond to an integrated luminosity of 4.6 fb-1. No significant excess is observed above the background expectation, and upper limits are set on the Higgs boson production cross section. The presence of the standard model Higgs boson with a mass in the 270--440 GeV range is excluded at 95 % confidence level.

Physics Analysis Summary

A note summarizing the analysis and the results can be found here: PAS

Approved plots and tables

Right-click on the plot to save it or to see it full-size.

The ET_miss distribution in data compared to the background simulation. The dielectron and dimuon channels are combined. Contributions from ZZ, WZ, non-resonant background and Z+jets background are stacked on top of each other. The ET_miss for mH = 300 GeV is also shown.
The MT distribution for events passing mH selections for 300 GeV. The dielectron and dimuon channels are combined.
The MT distribution for events passing mH selections for 400 GeV. The dielectron and dimuon channels are combined.
Background estimates, signal predictions, and observed number of events for an integrated luminosity of 4.6 fb-1 after the cut-based selection. The uncertainties include the statistical and systematic components (in that order). The results for signal contain only the systematic uncertainties as the statistical uncertainties are negligible. For the non-resonant background, the 68% upper limit is quoted in the case where the background prediction is zero.
The median expected and observed 95% CL upper limits on the cross section sigma x BR(HZZ2l2nu) for the Higgs boson masses in the range 250 - 600 GeV for the cut-based analysis
The median expected and observed 95% CL upper limits on the cross section sigma x BR(HZZ2l2nu) for the Higgs boson masses in the range 250 - 600 GeV for the shape-based analysis
The ratio R of the 95% CL cross section upper limit sigma to the SM Higgs boson production cross section sigma_SM as a function of the Higgs boson mass mH for the cut-based analysis.
The ratio R of the 95% CL cross section upper limit sigma to the SM Higgs boson production cross section sigma_SM as a function of the Higgs boson mass mH for the shape-based analysis.
Topic attachments
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PNGpng Figure1.png r1 manage 79.1 K 2015-05-06 - 22:48 MarcoPieri  
PNGpng Figure2a.png r1 manage 65.2 K 2015-05-06 - 22:48 MarcoPieri  
PNGpng Figure2b.png r1 manage 66.2 K 2015-05-06 - 22:48 MarcoPieri  
PNGpng Figure3a.png r1 manage 181.5 K 2015-05-06 - 22:48 MarcoPieri  
PNGpng Figure3b.png r1 manage 194.9 K 2015-05-06 - 22:48 MarcoPieri  
PNGpng Figure4a.png r1 manage 119.8 K 2015-05-06 - 22:48 MarcoPieri  
PNGpng Figure4b.png r1 manage 121.8 K 2015-05-06 - 22:48 MarcoPieri  
PNGpng Table.png r1 manage 91.1 K 2015-05-06 - 22:48 MarcoPieri  
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Topic revision: r6 - 2015-05-06 - MarcoPieri
 
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