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Searches for the Standardmodel H->ZZ*->4l

This page contains approved plots and results in the order as they appear in the CSC note. Only the CSC note contains all the relevant information and should thus be consulted if one of the plots is used.

fig01.
Figure 1: Muon trigger: selection efficiencies of the three trigger levels as a function of the true muon transverse momentum. The selection threshold is pTthres=20 GeV/c.

fig02.
Figure 2: Electron trigger: selection efficiencies of the three trigger levels as a function of the true electron transverse energy. The selection threshold is ETthres=22 GeV.

fig03.
Figure 3: Electron reconstruction efficiency as a function of η. The electron-id criteria are described in the text.

fig04.
Figure 4: Electron reconstruction efficiency as a function of pT. The electron-id criteria are described in the text.

fig05.
Figure 5: Muon reconstruction efficiency as a function of pT. Empty (filled) markers show the efficiency of the combined (combined+extrapolated from the ID) algorithm. Reconstructed muons of a Higgs boson sample of 130 GeV mass decaying into four muons are used.

fig06.
Figure 6: Muon reconstruction efficiency as a function of η. Empty (filled) markers show the efficiency of the combined (combined+extrapolated from the ID) package. Reconstructed muons of a Higgs boson sample of 130 GeV mass decaying into four muons are used.

fig07.
Figure 7: Zbb rejection versus H->4μ efficiency, or mH = 130GeV, for various calorimetric isolation cone sizes.

fig08.
Figure 8: Zbb rejection versus H->4μ efficiency, for mH = 130GeV, for various track isolation cone sizes.

fig09.
Figure 9: Zbb rejection versus H->4μ efficiency, for mH = 130GeV , for standard and normalized calorimetric isolation calculated in a ΔR=0.2 cone around the muon track.

fig10.
Figure 10: Zbb rejection versus H->4μ efficiency, for mH = 130GeV, for standard and normalized track isolation calculated in a ΔR=0.2 cone around the muon track.

fig11.
Figure 11: Normalized calorimetric isolation (ΔR=0.2) for the signal (mH = 130 GeV), the Zbb and tt backgrounds for the 4μ channel.

fig12.
Figure 12: Normalized track isolation (ΔR=0.2) for the signal, the Zbb and tt backgrounds for the 4μ channel.

fig13.
Figure 13: Signal and background distributions for electron track isolation, normalized to the electron track pT, in a cone ΔR <0.2.

fig14.
Figure 14: Transverse impact parameter significance for muons from signal and reducible background events.

fig15.
Figure 15: Transverse impact parameter significance for electrons from signal and reducible background events.

fig16.
Figure 16: Maximum impact parameter significance in 4-muon events, for signal and reducible backgrounds.

fig17.
Figure 17: Maximum impact parameter significance in 4-electron events, for signal and reducible backgrounds.

fig18.
Figure 18: Reconstructed H(130 GeV)->4e mass after application of the Z-mass constraint fit.

fig19.
Figure 19: Reconstructed H(130 GeV)->4μ mass after application of the Z-mass constraint fit.

fig20.
Figure 20: Reconstructed H(130 GeV)->2e2μ mass after application of the Z-mass constraint fit.

fig21.
Figure 21: Higgs -> 4e mass resolution as a function of the Higgs boson mass. Open circles denote the resolution obtained when no Z-mass constraint is applied, while full circles show the resolution in the case of the Z-mass constraint.

fig22.
Figure 22: Higgs -> 4μ mass resolution as a function of the Higgs boson mass. Open circles denote the resolution obtained when no Z-mass constraint is applied, while full circles show the resolution in the case of the Z-mass constraint.

fig23.
Figure 23: Shift of the mean 4-lepton mass for each of the three decay channels, with and without the Z-mass constraint on the dilepton mass.

fig24.
Figure 24: Selection efficiency as a function of the Higgs boson mass, for each of the three decay channels, for the case of only one on-shell Z.

fig25.
Figure 25: Selection efficiency for as a function of the Higgs boson mass, for each of the three decay channels, for the case of two on-shell Z's.

fig26.
Figure 26: Reconstructed 4-lepton mass for signal and background processes, in the case of a 130 GeV Higgs boson, normalized to a luminosity of 30 fb-1.

fig27.
Figure 27: Reconstructed 4-lepton mass for signal and background processes, in the case of a 150 GeV Higgs boson, normalized to a luminosity of 30 fb-1.

fig28.
Figure 28: Reconstructed 4-lepton mass for signal and background processes, in the case of a 180 GeV Higgs boson, normalized to a luminosity of 30 fb-1.

fig29.
Figure 29: Reconstructed 4-lepton mass for signal and background processes, in the case of a 300 GeV Higgs boson, normalized to a luminosity of 30 fb-1.

fig30.
Figure 30: Reconstructed 4-lepton mass for signal and background processes, in the case of a 400 GeV Higgs boson, normalized to a luminosity of 30 fb-1 .

fig31.
Figure 31: Reconstructed 4-lepton mass for signal and background processes, in the case of a 600 GeV Higgs boson, normalized to a luminosity of 30 fb-1.

fig32.
Figure 32: Expected signal significances computed using Poisson statistics, for each of the three decay channels, and their combination.

fig33.
Figure 33: Fraction of selected events with and without pile-up and cavern background, for the cuts in Tables 7 and 8 (130 GeV H->4e and 4μ analyses).

fig34.
Figure 34: A pseudo-experiment corresponding to 30 fb-1 of data for a Higgs boson mass of 130 GeV. The functions fitting the signal and the background are shown.

fig35.
Figure 35: A pseudo-experiment corresponding to 30 fb-1 of data for a Higgs boson mass of 180 GeV. The functions fitting the signal and the background are shown.

fig36.
Figure 36: Significance obtained from the profile likelihood ratio, as a function of the Higgs boson mass. The result is compared with the one shown in Section 4 where systematic errors on signal and background have not been included, and the significance has been calculated using Poisson statistics.

fig37.
Figure 37: The luminosity needed for exclusion of the Standard Model Higgs boson with the H->ZZ*->4l channel alone, as a function of the Higgs boson mass.

fig38.
Figure 38: Validation of the median significance estimation with toy Monte-Carlo experiments. The μ value corresponding to 95% CL exclusion obtained from Asimov data is compared to the one obtained using the median profile likelihood ratio from the toy MC pseudo-experiments.


Major updates:
-- WolfgangMader - 27 Jan 2009

Responsible: CalebLampen
Last reviewed by: Never reviewed

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Topic revision: r16 - 2011-01-26 - PatrickJussel
 
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