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Discovery potential of h/H/A->ττ->ll 4ν

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.

Analysis of the Exclusive Lepton Lepton Final State

Introduction

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Figure 1: Systematic uncertainty on the signal cross-section for associated Higgs boson production as a function of mA . The dashed line corresponds to the contribution from the scale uncertainty, the dash-dotted line to that introduced by the uncertainty on the parton distribution functions, and the solid line is the sum of both contributions added in quadrature.

Preselection

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Table 2: Cross-section in fb passing the preselection criteria. The numbers for the signal samples are given assuming tanβ=20. In the event samples marked '2μ filter' two muons are required to be present at generator level. The numbers marked with (*) were obtained using cut factorization.

Event Selection

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Figure 2: Invariant mτ+ τ- distribution for a Higgs boson of mass mA = 130 GeV (left) after preselection cuts. The width has been determined by a fit of a single Gaussian to the peak region of the distribution. The right-hand plot shows the mτ+ τ- distribution as a function of the pT of the Higgs boson.

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Table 3: Accepted cross-section in fb for optimized cuts for mA=130GeV and tanβ=20. The values of the cuts applied are stated for the ee/μμ (upper row) and eμ (lower row) subchannels. In case only one number is given it applies to all leptonic subchannels.

Selection Results

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Table 4: Accepted cross-section for all Higgs boson mass hypotheses analyzed. The cross-section in fb for signal and background after all selection cuts is given (except for the cut on the mass window) for tanβ=20.

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Figure 3: Invariant mτ τ distribution for Higgs boson candidates with nominal masses as indicated in the plots. The distributions are shown after all selection cuts for tanβ=20. The vertical lines indicate the mass window used for calculating the signal significance.

Estimation of Z->ττ Background from Data

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Figure 4: Distribution of the invariant dilepton mass mll (left). The shaded area illustrates the distribution from Z->μμ events, and the solid line that from signal events. The contribution from Z->τ+τ- and tt events is illustrated by the dashed and dotted lines, respectively. The cut on the invariant ll mass is indicated by the solid vertical lines. The distribution of pTmiss in the calorimeter for Z->μμ and Z->ττ->μμ + X events (right). All plots shown are after preselection cuts.

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Figure 5: Comparison of the pTmiss, x1 x1 , and mττ spectra for events of type Z->μμ and Z->ττ.Good agreement within the statistical uncertainties is observed.

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Figure 6: Comparison of the mττ shape for Z->ττ->μμ + X , Z->ττ-> ee + X , and Z->ττ->μe+X events. Good agreement is observed within the statistical uncertainties of the samples used.

Systematic Uncertainties

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Table 5: Effects of systematic uncertainties for different Higgs boson masses for tanβ=20. The effects of the systematic uncertainties considered are listed in percent. The total uncertainty is obtained by adding the individual contributions in quadrature.

Results and Discovery Potential

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Figure 7: The five σ discovery potential (left) and the 95% exclusion limit (right) as a function of mA and tanβ. The solid line represents the main result of the analysis. The dashed lines indicate the discovery potential and exclusion limit including an addition 10% uncertainty on the tt cross-section. The bands represent the influence of the systematic uncertainty on the signal cross-section.

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Figure 8: The discovery potential as a function of tanβ and for Higgs boson masses as indicated in the plots. The solid lines indicate the discovery potential including experimental systematic uncertainties. The dashed lines indicate the discovery potential including an additional systematic uncertainty on the tt cross-section. The bands indicate the impact of the systematic uncertainty on the signal cross-section.

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Figure 9: The discovery potential as a function of mA. The solid lines indicate the discovery potential including experimental systematic uncertainties for tanβ values as indicated in the plots. The dashed lines indicate the discovery potential including an additional systematic uncertainty on the tt cross-section of 10%. The bands indicate the impact of the systematic uncertainty on the signal cross-section.


Major updates:
-- WolfgangMader - 25 Apr 2008

Responsible: CalebLampen
Last reviewed by: Never reviewed


This topic: AtlasPublic > Atlas > PhysicsResults > PublicPlotsHG7
Topic revision: r32 - 2011-01-26 - PatrickJussel
 
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