Model Independent Search for Deviations from the Standard Model ...

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122 Results and Interpretation events / 5 GeV 10 1 Event Class: 1ν1µ1e+X -5 p = 4×10 ~ P = 0.001 events / 5 GeV 10 1 Event Class: 1ν1µ1e p = 0.001 ~ P = 0.02 -1 10 -1 10 events / 5 GeV 10 1 30 40 50 60 70 80 90 100 110 MET [GeV] Event Class: 1ν1µ1e+X -4 p = 5×10 ~ P = 0.02 events / 5 GeV -2 10 10 1 30 40 50 60 70 80 90 100 MET [GeV] Event Class: 1ν1µ1e2j+X -4 p = 7×10 ~ P = 0.04 -1 10 -1 10 events / 5 GeV -2 10 10 1 50 100 150 200 250 sum of p T [GeV] Event Class: 1ν1µ1e2j+X -5 p = 6×10 ~ P = 0.002 events / 5 GeV -2 10 220 240 260 280 300 320 340 360 380 sum of p T [GeV] 10 1 Event Class: 1ν1µ1e2j -4 p = 4×10 ~ P = 0.01 -1 10 -1 10 -2 10 -2 10 40 60 80 100 120 140 MET [GeV] 40 60 80 100 120 140 MET [GeV] Figure 9.12: Results of the Search Algorithm in the 1ν 1µ 1e(+X) inclusive and exclusive event classes (rst three plots) and in the 1ν 1µ 1e 2j(+X) inclusive and exclusive event classes (last three plots).
9.2. Electron Sample 123 To conclude, 4 classes with signicant deviations are found in the electron data sample: 1ν 1e(+X), 1ν 2e(+X), 1ν 1µ 1e(+X) and 1ν 1µ 1e 2j(+X) What strikes about three of those classes is, that the corresponding muon classes were also valued as not compatible with the MC prediction. Further studies should investigate the origins of these deviations in both lepton classes. In the context of this Model Independent Search, no indications of New Physics can be claimed. For most deviations imperfections in the Monte Carlo simulations can be blamed. Only with the help of more statistics and more elaborate selection cuts, a hint of New Physics could be found in these classes. The rest of the event classes agrees well with the Standard Model prediction, but a general trend can be observed that MET in the electron data is not well understood. This should be solved for future analyses. The other Model Independent Search analysis of DØ RunII (see [1]) observes signicant deviations in the high-p T tails of the single electron classes 1e(+X) and in the di-electron classes 2e(+X), as well. This supports the conclusion that parts of the distributions in these event classes, with or without MET, are not well understood.
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Model Independent Search for Deviat
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Contents 4 The Data Sample and Obje
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Introduction Science attempts to de
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4 The Theoretical Foundations 1.1.2
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6 The Theoretical Foundations e - e
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8 The Theoretical Foundations Figur
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10 The Theoretical Foundations Figu
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12 The Theoretical Foundations 1.3
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14 The Theoretical Foundations cont
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16 Tevatron and the DØ-Detector Fi
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22 Tevatron and the DØ-Detector 1/
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24 Tevatron and the DØ-Detector 2.
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26 Tevatron and the DØ-Detector of
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Chapter 3 The Concept of Model Inde
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3.2. Concept 31 viations from SM. T
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3.2. Concept 33 cal problem as many
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36 The Data Sample and Object Ident
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muon_trackchi_pt_py Entries 5727 mu
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jet_eta_phi_px Entries 29768 Mean j
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Chapter 5 Monte Carlo Samples 5.1 M
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5.1. MC Generator 53 Figure 5.3: Sc
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5.2. SM-Processes 55 SM-process (M
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5.3. Energy Scale and Smearing 57 J
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5.3. Energy Scale and Smearing 59 e
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62 General Data↔MonteCarlo Compar
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Page 78 and 79: 72 General Data↔MonteCarlo Compar
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Page 103 and 104: Chapter 8 Systematic Uncertainties
Page 105 and 106: 8.3. QCD-Background 99 Whendicingda
Page 107 and 108: 8.5. Smearing 101 Here N j i (σ+ )
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Page 133 and 134: Chapter 10 Conclusion In this diplo
Page 135 and 136: Appendix A Trigger Denitions Electr
Page 137: 131 Muon-triggers for lists up to v
Page 140 and 141: 134 Bibliography [19] A. Aktas et a
Page 143 and 144: Acknowledgements So, the end is nea
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