Figure 1 Nature of the NLSP in an example (Λ-tan β)-plane of the GMSB parameter space (Mm = 250 TeV, N5 = 3, sgn μ = +, Cgrav = 1). |
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Figure 2 SUSY mass spectrum for the benchmark scenario GMSB6. The $\PSgt_1$ (NLSP) has a mass of 102.8 GeV. The quasi-massless gravitino (2.4 eV) is not shown. |
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Figure 3 Comparison of the full (circles) and fast (triangles) simulation: (a) ETmiss, (b) number of jets with pT > 20 GeV, (c) pT of the leading jet, (d) pT of the second leading jet, (e) number of τ leptons with pT > 15 GeV, (f) pT of the leading τ lepton. |
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Figure 4 Signal preselection: (a) total event numbers after each step of the preselection; event distributions after the preselection for the GMSB signal and the various SM backgrounds: (b) missing transverse energy, (c) number of τ leptons with pT > 15 GeV (pT > 20 GeV for the leading τ). |
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Figure 5 Signal significance (S = NS/sqrt(N)B) as a function of the cut values of ETmiss and Nτ. The maximum significance is obtained for ETmiss > 280 GeV and Nτ ≥ 2. |
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Figure 6 Event distributions after the final selection for the GMSB signal and the various SM backgrounds: (a) ETmiss after the Nτ ≥ 2 cut, (b) number of τ leptons with pT > 15 GeV (pT > 20 GeV for the leading τ) after the ETmiss > 280 GeV cut. |
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Figure 7 Total SUSY cross section in pb at sqrt(s) = 10 TeV in the (Λ-tan β)-plane for Mm = 250 TeV, N5 = 3, sign μ = + and Cgrav = 1. It strongly depends on Λ due to the increase of the masses of the SUSY particles with increasing Λ. |
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Figure 8 Expected number of selected signal events for L = 200 pb-1 in the (Λ-tan β)-plane for Mm = 250 TeV, N5 = 3, sgn μ = + and Cgrav = 1. The expected number of corresponding background events is NB = 2.5. |
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Figure 9 Integrated luminosity needed for a signal significance of S = 5 or Zn = 5, respectively, in the (Λ-tan β)-plane for Mm = 250 TeV, N5 = 3, sgn μ = + and Cgrav = 1 using (a) the simple calculation of the significance following Eq. (2) which neglects the uncertainty on the SM background and (b) using Eq. (3) which properly includes this uncertainty. |
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Figure 10 Distribution of events in the plane of ETmiss and pT of the leading jet for (a) the signal and (b) the SM background for 8 fb-1. The elliptical cut is indicated by the hashed region. All events outside this region are selected. |
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Figure 11 Invariant mass distribution of two τ leptons originating from different decay processes for the GMSB6 signal: (a) generator level, (b) reconstruction level for selected events. |
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Figure 12 Invariant mass distribution of (a) any two τ leptons for the GMSB6 signal and the SM background after the selection and (b) the same-sign distribution (SS) subtracted from the opposite-sign distribution (OS) for L = 8 fb-1. |
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Figure 13 Example fits of the invariant mass (OS-SS) distribution using different fit ranges. |
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Table 1 SM background processes. |
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Table 2 Total numbers of selected events for the signal and various SM background processes at different stages of the event selection for L = 200 pb-1 and sqrt(s) = 10 TeV. The uncertainties given correspond to statistical uncertainties from the limited MC statistics. Some background processes give contributions significantly below one event after the final selection due to the selection cuts on the jet pT and ETmiss and are therefore negligible. The reason for the large rejection of dijets is because only a small fraction of such events have a sufficiently hard scatter to pass all selection requirements |
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