Search for the Higgs Boson in the Fully Leptonic W+W- Final State

This is a condensed description with plots for the analysis LINK TO CDS

Abstract

This paper reports a search for the Higgs boson decaying to W+W- in pp collisions at sqrt{s} = 7TeV. The analysis is performed using LHC data recorded with the CMS detector, corresponding to an integrated luminosity of 1.1 fb-1. W+W- candidates are selected in events with two leptons, electrons or muons. No significant excess above the standard model background expectation is observed, and upper limits on Higgs boson production are derived, excluding the presence of Higgs boson with a mass in [150 - 190] GeV/c^2 range at 95\% C.L. For a Higgs boson with a mass of 160 GeV/c2 the observed (expected) upper limit is about 0.6 (0.3) times the standard model prediction.

Main Results

  • Cut based analysis results: Higgs Cross section / SM Higgs Cross section limits evaluated with CLs method.

Mass Observed Median Expected 68% probability band 95% probability band
115 5.364 4.642 [3.308, 6.663] [2.927, 9.335]
120 4.439 2.908 [2.153, 4.226] [1.666, 5.911]
130 2.517 1.426 [1.134, 2.118] [0.817, 2.934]
140 1.377 0.876 [0.663, 1.270] [0.541, 1.799]
150 1.024 0.661 [0.516, 0.939] [0.423, 1.294]
160 0.613 0.383 [0.286, 0.538] [0.224, 0.736]
170 0.657 0.433 [0.313, 0.609] [0.259, 0.833]
180 0.586 0.539 [0.364, 0.792] [0.241, 1.079]
190 1.078 0.807 [0.618, 1.170] [0.451, 1.706]
200 1.551 1.187 [0.812, 1.655] [0.573, 2.300]
250 1.933 2.100 [1.466, 3.050] [0.922, 3.093]
300 2.625 2.363 [1.623, 3.332] [1.132, 4.584]
350 2.635 2.231 [1.547, 3.321] [1.093, 4.826]
400 2.606 2.498 [1.819, 3.736] [1.342, 4.473]
450 2.597 3.407 [2.303, 4.893] [1.660, 7.169]
500 3.563 4.662 [3.166, 6.836] [2.373, 9.499]
550 3.518 6.337 [4.065, 9.047] [2.861, 12.845]
600 4.815 8.926 [5.918, 13.097] [5.102, 18.288]

  • multivariate analysis results: Higgs Cross section / SM Higgs Cross section limits evaluated with CLs method.

Mass Observed Median Expected 68% probability band 95% probability band
115 7.428 3.140 [2.365, 4.555] [1.971, 6.591]
120 3.769 1.963 [1.340, 2.823] [1.135, 4.099]
130 1.901 0.994 [0.727, 1.463] [0.536, 2.110]
140 1.344 0.647 [0.461, 0.902] [0.362, 1.288]
150 1.016 0.459 [0.335, 0.682] [0.272, 0.914]
160 0.650 0.269 [0.198, 0.386] [0.173, 0.567]
170 0.592 0.303 [0.220, 0.459] [0.167, 0.631]
180 0.706 0.439 [0.303, 0.621] [0.238, 0.911]
190 0.916 0.686 [0.480, 0.988] [0.336, 1.349]
200 1.384 0.994 [0.675, 1.373] [0.498, 1.875]
250 1.439 1.517 [1.055, 2.212] [0.779, 2.569]
300 1.543 1.728 [1.162, 2.509] [0.841, 2.733]
350 2.234 1.631 [1.184, 2.384] [0.919, 3.240]
400 1.712 1.807 [1.226, 2.515] [1.073, 3.595]
450 2.372 2.532 [1.741, 3.592] [1.422, 5.231]
500 1.948 3.431 [2.356, 4.971] [1.413, 6.965]
550 3.493 4.949 [3.296, 7.103] [1.950, 9.924]
600 4.596 6.947 [4.814, 10.078] [3.684, 14.805]

Images Links Description

png,pdf,eps Missing energy for low PU and high PU in Drell Yan events
png,pdf,eps Comparison of number of reconstructed vertices versus the number of pile-up interacations for various reconstruction algorithms
png,pdf,eps Jet veto efficiency as a function of the number of primary vertices
png,pdf,eps Projected missing transverse momentum algorithms versus number of reconstructed vertices
png,pdf,eps Projected track missing transverse momentum versus projected particle flow missing transverse momentum in simulated Drell-Yan events
png,pdf,eps Projected track missing transverse momentum versus projected particle flow missing transverse momentum in simulated signal events
png,pdf,eps Projected track missing transverse momentum versus projected particle flow missing transverse momentum in 1.1 /fb of data
png,pdf,eps Number of reconstructed anti-kt (R=0.5) jets in data compared to simulated signal and background samples
png,pdf,eps Number of b-tagged jets in the one-jet analysis in data compared to simulated signal and background samples
png,pdf,eps Minimum of projected track missing transverse momentum and projected particle flow missing transverse momentum in data compared to simulated signal and background samples after trigger selections
png,pdf,eps Difference in azimuthal angle between the two leptons in the 0-jet bin in data compared to simulated signal and background samples after the WW selection
png,pdf,eps Invariant mass of the two leptons in the 0-jet bin in data compared to simulated signal and background samples after the WW selection
png,pdf,eps Transverse Higgs mass in the 0-jet bin in data compared to simulated signal and background samples after the WW selection
png,pdf,eps Minimum of projected track missing transverse momentum and projected particle flow missing transverse momentum in the 0-jet bin in data compared to simulated signal and background samples after the WW selection
png,pdf,eps Trailing lepton transverse momentum in the 0-jet bin in data compared to simulated signal and background samples after the WW selection
png,pdf,eps Leading lepton transverse momentum in the 0-jet bin in data compared to simulated signal and background samples after the WW selection
png,pdf,eps Difference in azimuthal angle between the two leptons in the 1-jet bin in data compared to simulated signal and background samples after the WW selection
png,pdf,eps Invariant mass of the two leptons in the 1-jet bin in data compared to simulated signal and background samples after the WW selection
png,pdf,eps Transverse Higgs mass in the 1-jet bin in data compared to simulated signal and background samples after the WW selection
png,pdf,eps Minimum of projected track missing transverse momentum and projected particle flow missing transverse momentum in the 1-jet bin in data compared to simulated signal and background samples after the WW selection
png,pdf,eps Trailing lepton transverse momentum in the 1-jet bin in data compared to simulated signal and background samples after the WW selection
png,pdf,eps Leading lepton transverse momentum in the 1-jet bin in data compared to simulated signal and background samples after the WW selection
png,pdf,eps BDT output for opposite flavor events in the 0-jet bin in data compared to simulated signal and background samples after the WW selection
png,pdf,eps BDT output for same flavor events in the 0-jet bin in data compared to simulated signal and background samples after the WW selection
png,pdf,eps BDT output for opposite flavor events in the 1-jet bin in data compared to simulated signal and background samples after the WW selection
png,pdf,eps BDT output for same flavor events in the 1-jet bin in data compared to simulated signal and background samples after the WW selection
png,pdf,eps Expected limits for background only case and mean-observed limits in the presence of a Higgs with mh = 120 GeV
png,pdf,eps Expected limits for background only case and mean-observed limits in the presence of a Higgs with mh = 130 GeV
png,pdf,eps Expected limits for background only case and mean-observed limits in the presence of a Higgs with mh = 140 GeV
png,pdf,eps Expected limits for background only case and mean-observed limits in the presence of a Higgs with mh = 150 GeV
png,pdf,eps Cut-based (all jet bins) modified frequentist 95% expected and observed confidence level upper limits on the cross section times branching ratio relative to the SM value
png,pdf,eps Cut-based (all jet bins, zoom) modified frequentist 95% expected and observed confidence level upper limits on the cross section times branching ratio relative to the SM value
png,pdf,eps Cut-based (all jet bins, log-x) modified frequentist 95% expected and observed confidence level upper limits on the cross section times branching ratio relative to the SM value
png,pdf,eps Cut-based (0-jet bin) modified frequentist 95% expected and observed confidence level upper limits on the cross section times branching ratio relative to the SM value
png,pdf,eps Cut-based (0-jet bin, zoom) modified frequentist 95% expected and observed confidence level upper limits on the cross section times branching ratio relative to the SM value
png,pdf,eps Cut-based (0-jet bin, log-x) modified frequentist 95% expected and observed confidence level upper limits on the cross section times branching ratio relative to the SM value
png,pdf,eps Cut-based (1-jet bin) modified frequentist 95% expected and observed confidence level upper limits on the cross section times branching ratio relative to the SM value
png,pdf,eps Cut-based (1-jet bin, zoom) modified frequentist 95% expected and observed confidence level upper limits on the cross section times branching ratio relative to the SM value
png,pdf,eps Cut-based (1-jet bin, log-x) modified frequentist 95% expected and observed confidence level upper limits on the cross section times branching ratio relative to the SM value
png,pdf,eps Cut-based (2-jet bin) modified frequentist 95% expected and observed confidence level upper limits on the cross section times branching ratio relative to the SM value
png,pdf,eps Cut-based (2-jet bin, zoom) modified frequentist 95% expected and observed confidence level upper limits on the cross section times branching ratio relative to the SM value
png,pdf,eps Cut-based (2-jet bin, log-x) modified frequentist 95% expected and observed confidence level upper limits on the cross section times branching ratio relative to the SM value
png,pdf,eps Shape-based (all jet bins) modified frequentist 95% expected and observed confidence level upper limits on the cross section times branching ratio relative to the SM value
png,pdf,eps Shape-based (all jet bins, zoom) modified frequentist 95% expected and observed confidence level upper limits on the cross section times branching ratio relative to the SM value
png,pdf,eps Shape-based (all jet bins, log-x) modified frequentist 95% expected and observed confidence level upper limits on the cross section times branching ratio relative to the SM value
png,pdf,eps Shape-based (0-jet bin) modified frequentist 95% expected and observed confidence level upper limits on the cross section times branching ratio relative to the SM value
png,pdf,eps Shape-based (0-jet bin, zoom) modified frequentist 95% expected and observed confidence level upper limits on the cross section times branching ratio relative to the SM value
png,pdf,eps Shape-based (0-jet bin, log-x) modified frequentist 95% expected and observed confidence level upper limits on the cross section times branching ratio relative to the SM value
png,pdf,eps Shape-based (1-jet bin) modified frequentist 95% expected and observed confidence level upper limits on the cross section times branching ratio relative to the SM value
png,pdf,eps Shape-based (1-jet bin, zoom) modified frequentist 95% expected and observed confidence level upper limits on the cross section times branching ratio relative to the SM value
png,pdf,eps Shape-based (1-jet bin, log-x) modified frequentist 95% expected and observed confidence level upper limits on the cross section times branching ratio relative to the SM value
png,pdf,eps Cut-based (all jet bins) Bayesian 95% expected and observed confidence level upper limits on the cross section times branching ratio relative to the SM value
png,pdf,eps Cut-based (0-jet bin) Bayesian 95% expected and observed confidence level upper limits on the cross section times branching ratio relative to the SM value
png,pdf,eps Cut-based (1-jet bin) Bayesian 95% expected and observed confidence level upper limits on the cross section times branching ratio relative to the SM value
png,pdf,eps Cut-based (2-jet bin) Bayesian 95% expected and observed confidence level upper limits on the cross section times branching ratio relative to the SM value
png,pdf,eps Shape-based (all jet bins) Bayesian 95% expected and observed confidence level upper limits on the cross section times branching ratio relative to the SM value
png,pdf,eps Shape-based (0-jet bin) Bayesian 95% expected and observed confidence level upper limits on the cross section times branching ratio relative to the SM value
png,pdf,eps Shape-based (1-jet bin) Bayesian 95% expected and observed confidence level upper limits on the cross section times branching ratio relative to the SM value
png,pdf,eps Cut-based (0-jet bin) Bayesian 95% expected limits in the case of background only and mean expected limits in the presence of a Higgs with mh=120 GeV
png,pdf,eps Cut-based (0-jet bin) Bayesian 95% expected limits in the case of background only and mean expected limits in the presence of a Higgs with mh=130 GeV
png,pdf,eps Cut-based (0-jet bin) Bayesian 95% expected limits in the case of background only and mean expected limits in the presence of a Higgs with mh=140 GeV
png,pdf,eps Cut-based (0-jet bin) Bayesian 95% expected limits in the case of background only and mean expected limits in the presence of a Higgs with mh=150 GeV
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Topic revision: r16 - 2011-12-09 - EmanueleDiMarco
 
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