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Discovery Potential of A/H→τ+τ-→lh in ATLAS

This page contains approved plots and results as they appear in the ATL-PHYS-PUB-2010-011 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. Please contact the HSG Documentation manager if you find any errors on this page.

Figure 1: Trigger efficiency as a function of $p_T$ for electrons (left) and muons (right). For the extraction of the trigger of the trigger efficiency, a Gaussian error function is fit to the data. In the plateau region, a trigger efficiency of ~ 98% (~ 81%) for electrons (muons) is obtained.

Figure 2: Optimized selection criteria for $\Delta\Phi_{\ell,\tau}$ (left), $E_{T}^{\tau}$ (right) for a Higgs boson mass hypothesis of $m_A$ = 300 GeV in the non-b-tagged (top row) and b-tagged (bottom row) analysis. The chosen selection cuts are shown as horizontal black lines.

Figure 3: Transverse mass distribution in the W+jets control region before the transverse-mass window cut is applied (left) and the invariant $m_{\tau\tau}$ distribution for W+jets events in the control and signal regions (right).

Figure 4: Left: $Z \to \tau \tau$ reference histogram showing the visible energy of the hadronically decaying $\tau$ lepton versus that of the light lepton in the $Z$-boson rest frame, for 0.2 < |$cos \theta_{GJ}$| < 0.4. Right: Invariant $m_{\tau\tau}$ distribution for $Z \to \tau \tau$ events (shaded rectangles) compared with $Z\to e e$ events after rescaling (points with error bars).

Figure 5: Jet multiplicity distribution in the control region (left) and in the signal region (right). In the control region a high purity of $t\bar{t}$ events is observed. Good agreement between the predicted and the observed number of $t\bar{t}$ events is achieved in the signal region, in particular for the one-jet and the two-jet bins relevant to this analysis.

Figure 6: The five-σ discovery potential as a function of tanβ and $m_A$. The solid green line is the result of the lepton-hadron analysis. The dashed green lines indicates the effect of the theoretical uncertainty on the signal cross section. The red line gives the results for the fully correlated treatment of systematic uncertainties. The dash-dotted black line shows the discovery potential without inclusion of systematic uncertainties for comparison with previous results. The results from the lepton-lepton analysis are superimposed as blue lines. The solid line indicates the result including only experimental systematic uncertainties and the dashed line indicates the result including a 10% theoretical uncertainty on the $t\bar{t}$ cross-section.

Figure 7: Invariant mass of the $\tau\tau$ system in the non-b-tagged (left) and the b-tagged analysis (right). The size of the signal contribution is scaled to a tanβ value of 14, corresponding to the value necessary for a five-σ discovery. The mass window used to calculate the significance is indicated by vertical black lines.

Figure 8: Invariant mass of the $\tau\tau$ system in the non-b-tagged (left) and the b-tagged analysis (right). The size of the signal contribution is scaled to a tanβ value of 14, corresponding to the value necessary for a five-σ discovery. The mass window used to calculate the significance is indicated by vertical black lines.

Figure 9: Invariant mass of the $\tau\tau$ system in the non-b-tagged (left) and the b-tagged analysis (right). The size of the signal contribution is scaled to a tanβ value of 14, corresponding to the value necessary for a five-σ discovery. The mass window used to calculate the significance is indicated by vertical black lines.

Figure 10: Invariant mass of the $\tau\tau$ system in the non-b-tagged (left) and the b-tagged analysis (right). The size of the signal contribution is scaled to a tanβ value of 14, corresponding to the value necessary for a five-σ discovery. The mass window used to calculate the significance is indicated by vertical black lines.

Figure 11: Invariant mass of the $\tau\tau$ system in the non-b-tagged (left) and the b-tagged analysis (right). The size of the signal contribution is scaled to a tanβ value of 14, corresponding to the value necessary for a five-σ discovery. The mass window used to calculate the significance is indicated by vertical black lines.

Figure 12: Invariant mass of the $\tau\tau$ system in the non-b-tagged (left) and the b-tagged analysis (right). The size of the signal contribution is scaled to a tanβ value of 14, corresponding to the value necessary for a five-σ discovery. The mass window used to calculate the significance is indicated by vertical black lines.


Major updates:
-- CalebLampen - 22-Jul-2010

Responsible: CalebLeeParnellLampenExCern
Last reviewed by: Never reviewed

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