The results of searches for new physics in events with two same-sign isolated leptons,
hadronic jets, and missing transverse energy in the final state are presented. The
searches use an integrated luminosity of 35 pb−1 of pp collision data at a centre-of-
mass energy of 7
collected by the CMS experiment at the LHC. The observed
numbers of events agree with the standard model predictions, and no evidence for
new physics is found. To facilitate the interpretation of our data in a broader range
of new physics scenarios, information on our event selection, detector response, and
efficiencies is provided.
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Abbreviated Caption |
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Figure 1 : An example of a process involving the production and decays of SUSY particles, which gives rise to two same-sign prompt leptons, jets, and missing transverse energy. |
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Figure 2a : HT versus ET scatter plots for baseline region. Overlay of the three observed events with the expected signal distribution for LM0. The three observed events all scatter in the lower left corner of the plot. |
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Figure 2b : HT versus ET scatter plots for baseline region. Scatter plot of the background in data when only one of the two leptons is required to be isolated. |
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Figure 3 : HT Trigger efficiency as a function of the reconstructed HT for three data-collecting periods: 7 pb−1 with HT 1, 10 pb−1 with HT 2, and 18 pb−1 with HT 3. |
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Figure 4a : Electron (left) and muon (right) TL probability TL computed from QCD multijet events with different requirements on the minimum p T of the away-jet. The probabilities shown are projections of the two-dimensional function TL (η, p T ) onto the p T axis. |
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Figure 4b : Electron (left) and muon (right) TL probability TL computed from QCD multijet events with different requirements on the minimum p T of the away-jet. The probabilities shown are projections of the two-dimensional function TL (η, p T ) onto the p T axis. |
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Figure 5a : The lepton isolation efficiency for one (solid squares) and two (open squares) leptons as a function of the relative isolation parameter cut. Also shown is the predicted double-lepton efficiency if the two lepton efficiencies are assumed to be independent of each other. Only the dimuon sample is shown here |
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Figure 5b : The lepton isolation efficiency as a function of the ET cut for electrons and muons with different requirements on the lepton impact parameter. |
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Figure 6a : Isolation variable distributions obtained with the BTag-and-probe method for muons (left) and electrons (right). Efficiencies for the Rel Iso < 0.15 (first bin in the distributions shown) are explicitly quoted |
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Figure 6b : Isolation variable distributions obtained with the BTag-and-probe method for muons (left) and electrons (right). Efficiencies for the Rel Iso < 0.15 (first bin in the distributions shown) are explicitly quoted |
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Figure 7 : (Left) The probability to mismeasure the electron charge as a function of η in the p T range 10−100 GeV, as obtained from simulation. (Right) Same-sign ee invariant mass distribution in data compared with the Z → ee expectation from simulation |
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Figure 8 : A visual summary of the observed number of data events, the expected number of background events, and the composition of the background for the four search regions |
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Figure 9a : Electron, muon (left) and τh (right) selection efficiencies as a function of p T . The results of the fits described in the text are shown by the dotted lines. |
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Figure 9b : Electron, muon (left) and τh (right) selection efficiencies as a function of p T . The results of the fits described in the text are shown by the dotted lines. |
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Figure 10 : Exclusion contour in the m0 —m1/2 plane for CMSSM as described in the text. Comparing the width of the red shaded band (theoretical uncertainty) around the blue curve with the difference between the solid blue and dashed black curves shows that the imperfections in the simple efficiency model described in the text are small compared to the theoretical uncertainties. |