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Prospects for Higgs Boson Searches using the H->WW*->lνlν Decay Mode with the ATLAS Detector for 10TeV

This page contains approved plots and results as they appear in the ATL-PHYS-PUB-2010-005 note. Only the note contains all the relevant information and should thus be consulted if one of the plots is used. Click on an image to download in eps format.

Figure 1: Leading order Feynman diagrams of $H\rightarrow{}WW^{(*)}$ signal processes: The gluon fusion process, a), and the Vector Boson Fusion process, b).

Figure 2: Kinematic distributions relevant to the preselection (see Section 5.1). The plots correspond to the distributions of the missing transverse momentum and $m^{\ell\ell}_{T}$ after the application of cuts Ib and Ic, respectively.

Figure 3: Kinematic distributions relevant to the $H + 0j$ analysis for the Higgs boson signal ($m_H$ = 170 GeV) and the main background processes. The upper plots show the jet multiplicity and the dilepton invariant mass after the application of the candidate preselection (see Section 5.1) and cut 0jb, respectively. The lower plots show the distributions of $\Delta{}\phi_{\ell\ell}$ and $M_{T}$ after the application of cuts Ta and Tb, respectively.

Figure 4: Kinematic distribution relevant to the $H + 1j$ analysis for the Higgs boson signal ($m_H$ = 170 GeV) and the main background processes. The upper plots show the SV0 b-tagging weight and $P^{tot}_T$ after the application of cuts 1ja and 1jb, respectively. The lower plots show distributions of the dilepton invariant mass and $M_T$ after the application of cuts 1jd and Tb, respectively.

Figure 5: Kinematic distributions relevant to the $H + 2j$ analysis forthe Higgs boson signal ($m_H$ = 170 GeV) and the main background processes. The upper plots show the SV0 b-tagging weight and the pseudorapidity gap between tag jets after the application of cuts 2ja and 2jd, respectively. The lower plots display the distributions of $m_{jj}$ and $P^{tot}_{T}$ after the application of cuts 2je and 2jf, respectively.

Figure 6: Left: electron fake rate as a function of $p_T$. Right: muon fake rate as a function of $p_T$. The statistical uncertainty on the number of expected dijet event using a jet trigger with an integrated luminosity 200 pb-1 is shown in red solid line. Additionally, the MC statistics uncertainty is shown in black dotted line.

Figure 7: Measurement of the irreducible background and W+jets with the Subtraction method. Results are shown for the $H(\rightarrow{}WW^{(*)}\rightarrow{}e\nu\mu\nu)+0j$ channel after tha application of cut 0ja (see Section 5.2.1) in terms of the number of expected events, Nevents, divided by the electron identification, ID, efficiency as a function of the electron identification efficiency. The hollow red circles, solid blue squares and upside-down blck triangles correspond to the total expeted data, $W(\rightarrow{}\mu)+jets$ and the sum of the continuum $WW$ and top backgrounds respectively. The green triangels show the estimated $W(rightarrow{}\mu\nu)+jets$ background. A solid curve that goes through the total expected data corresponds to a fit (see text). This fit takes into account the correlations between points. Results are shown for an integrated luminosity of 200 pb-1.

Figure 8: Selected kinematic distributions for W+jets with different lepton identification requrements. Shown are the $m^{\ell\ell\nu}_{T}$ (left) and $\Delta{}\phi\ell\ell$ (right) with loose electron identification (squares) and tight electron identification (circles). Results are shown for an integrated luminosity of 200 pb-1.

Figure 9: The estimation of the jet veto efficiency for $t\bar{t}$ in the top box control region with b-tagging (red triangles). For comparison, the plot also shows the jet veto efficiency in the signal like region (blue squares) after the application of cut Id (see Section 5.1) found in Monte Carlo. Results are presented as a function of the $p_T$ threshold of the jet veto and for an integrated luminosity of 200 pb-1.

Figure : Flow chart describing the four data samples used in the $H\rightarrow{}WW^{(*)}\rightarrow{}\ell\nu\ell\nu$ analysis. S.R. and C.R. stand for signal and control regions, respectively.

Figure : Sampling distributions for the Likelihood Ratio, in background-only outcomes (red dashed line) and outcomes containing a Standard Model signal (black solid line) for a representative Higgs boson mass of 170 GeV and an integrated luminosity of 200 pb-1. The left plot shows the distributions for the "discovery" Likelihood ratio λ (μ = 0), while the right plot shows the distribution for the "limit-setting" Likelihood Ratio λ (μ = 1).

Figure 12: Left: the sampling distributions of the obtained upper bound on the signal normalization for a representative Higgs boson mass of 170 GeV and an integrated luminosity of 200 pb-1 for background-only outcomes (red) and for signal-plus-background outcomes (black). Right: the probability to incorrectly exclude a Standard Model Higgs boson when it is actually present in the data as a function of the Higgs boson mass.

Figure 13: The expected 95% confidence level limit on the signal normalization (in pb) as a function of Higgs boson mass if only background is present. The results are given for $\sqrt{s}$ = 10 TeV and an integrated luminosity of 200 pb-1. Shown are the results for each individual analysis and for the three analyses combined.

Figure 14: The expected 95% confidence level limit on the signal normalization in units of the Standard Model prediction if only background is present as a function of Higgs boson mass. The results are given for $sqrt{s}$ = 10 TeV and integrated luminosity of 200 pb-1. Shown are the results for each individual analysis and for the three analyses combined.


Major updates:
-- CalebLampen - 13-Jun-2010

Responsible: CalebLeeParnellLampenExCern
Last reviewed by: Never reviewed

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