# 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

**Figure 1:** Systematic uncertainty on the signal cross-section for associated Higgs boson production as a function of m_{A} . 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

**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

**Figure 2:** Invariant m

_{τ+ τ-} distribution for a Higgs boson of mass m

_{A} = 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 m

_{τ+ τ-} distribution as a function of the p

_{T} of the Higgs boson.

**Table 3:** Accepted cross-section in fb for optimized cuts for m_{A}=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

**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.

### Estimation of Z->ττ Background from Data

**Figure 4:** Distribution of the invariant dilepton mass m_{ll} (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 p_{T}^{miss} in the calorimeter for Z->μμ and Z->ττ->μμ + X events (right). All plots shown are after preselection cuts.

**Figure 6:** Comparison of the m_{ττ} 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

**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

**Figure 7:** The five σ discovery potential (left) and the 95%
exclusion limit (right) as a function of m_{A} 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.

**Major updates**:

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WolfgangMader - 25 Apr 2008

Responsible: WolfgangMader

Last reviewed by: **Never reviewed**