CERN-THESIS-2012-153 26/07/2012 - CERN Document Server

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Events / 5 GeV Events / 10 GeV 20 18 16 14 12 10 8 6 4 2 ATLAS Internal 1 ∫ L dt = 2.1 fb 2ID + TL data tt→ WbZq signal fakes ttW/Z dibosons bkg. uncertainty 0 50 60 70 80 90 100 110 120 20 18 16 14 12 10 8 6 4 2 (a) ATLAS Internal 1 ∫ L dt = 2.1 fb 2ID + TL mll [GeV] 0 120 140 160 180 200 220 240 (c) data tt→ WbZq signal fakes ttW/Z dibosons bkg. uncertainty m lνj [GeV] Events / 5 GeV Events / 10 GeV 20 18 16 14 12 10 8 6 4 2 ATLAS Internal 1 ∫ L dt = 2.1 fb 2ID + TL data tt→ WbZq signal fakes ttW/Z dibosons bkg. uncertainty 0 50 60 70 80 90 100 110 120 20 18 16 14 12 10 8 6 4 2 (b) ATLAS Internal 1 ∫ L dt = 2.1 fb 2ID + TL data mlν [GeV] tt→ WbZq signal fakes ttW/Z dibosons bkg. uncertainty 0 120 140 160 180 200 220 240 (d) mllq [GeV] Figure 5.10: The reconstructed mass of the (a) two leptons assigned to the Z-boson decay, (a) the lepton and the neutrino assigned to the W-boson, (c) the lepton, neutrino and jet assigned to the top quark with the SM decay, and (d) the two leptons and jet assigned to the top quark with FCNC decay after the χ 2 minimization. The dashed lines show the shapes of the signal distributions (normalized to the observed BR, at 95% CL). The uncertainties on the background are both statistical and systematic. 67
Events / 10 GeV trackleptons / 10 GeV 14 12 10 8 6 4 2 0 14 12 10 8 6 4 2 0 ATLAS Internal 1 ∫ L dt = 2.1 fb 2ID + TL data tt→ WbZq signal fakes ttW/Z dibosons bkg. uncertainty 40 80 120 160 200 (a) ATLAS Internal 1 ∫ L dt = 2.1 fb 2ID + TL miss ET [GeV] 30 40 50 60 70 80 90 100 (c) data tt→ WbZq signal fakes ttW/Z dibosons bkg. uncertainty p T [GeV] Events trackleptons 14 12 10 8 6 4 2 0 10 8 6 4 2 ATLAS Internal 1 ∫ L dt = 2.1 fb 2ID + TL data tt→ WbZq signal fakes ttW/Z dibosons bkg. uncertainty 2 3 4 5 (b) ATLAS Internal 1 ∫ L dt = 2.1 fb 2ID + TL Number of jets data tt→ WbZq signal fakes ttW/Z dibosons bkg. uncertainty 0 0 0.4 0.8 1.2 1.6 2 2.4 (d) | η| [rad] Figure 5.11: (a) E miss T , (b) number of jets, and (c) pT and (d) η of the TL distributions for events after the final selection. The dashed lines show the shapes of the signal distributions, normalized to the observed BR limit, at 95% CL. The uncertainties on the background are both statistical and systematic. 68
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CERN-THESIS-2012-153 26/07/2012 c
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Abstract A search for flavor-changi
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Acknowledgments I first want to tha
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Table of Contents List of Tables .
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List of Tables 2.1 The fundamental
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List of Figures 2.1 The potential V
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5.15 Distributions of the 3ID analy
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This thesis is organized as follows
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the question whether each neutrino
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gauge invariant field strength tens
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for strong interactions. Although W
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particles. Because of the introduct
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which is introduced for mass genera
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2.3 Top Quark The large mass of the
Page 29 and 30: ATLAS Preliminary Data 2011 Channel
Page 31 and 32: as the masses of the quarks involve
Page 33 and 34: LEP HERA Tevatron LHC BR(t → qγ)
Page 35 and 36: to Wtb couplings, where limits on a
Page 37 and 38: tion at the collision point, and F
Page 39 and 40: The positive x-direction is defined
Page 41 and 42: large air-core toroids (one barrel
Page 43 and 44: 3.3.3 Calorimetry The calorimetry i
Page 45 and 46: of ∼ 1% for the H → γγ and H
Page 47 and 48: esolution of 1 cm×1 ns with digita
Page 49 and 50: Luminosity measurement Accurate det
Page 51 and 52: least one hit on the A-side, at lea
Page 53 and 54: caps. The calorimeter selections ar
Page 55 and 56: ut instead fragment to color neutra
Page 57 and 58: Decays A large fraction of the part
Page 59 and 60: The ALGPEN program with HERWIG show
Page 61 and 62: Normalized to unit / 1.96429 GeV No
Page 63 and 64: Chapter 5 Event Selection 5.1 Intro
Page 65 and 66: Variable Cut pT >20 GeV Type MuID t
Page 67 and 68: Identification efficiency eff id 1
Page 69 and 70: (a) (b) Figure 5.4: Electron identi
Page 71 and 72: ε (P ) µ TL T 1 TL µ ε TL µ ε
Page 73 and 74: Jets in this analysis are reconstru
Page 75 and 76: impact parameter significance of we
Page 77 and 78: event is also discarded. Events wit
Page 79: event kinematics, however no b-jet
Page 83 and 84: analysis, is 22%. Figure 5.13(a) sh
Page 85 and 86: transverse momentum of the leading
Page 87 and 88: Events / 10 GeV Events / 10 GeV 14
Page 89 and 90: two background sources, diboson and
Page 91 and 92: ID leptons provides three different
Page 93 and 94: 3ID Final Selection ZZ and WZ 9.5
Page 95 and 96: data, has systematic uncertainties
Page 97 and 98: Jets The jet energy scale (JES) and
Page 99 and 100: the fake prediction was scaled down
Page 101 and 102: two or more, and events with E miss
Page 103 and 104: Source MC Background Luminosity ±
Page 105 and 106: Chapter 8 Limit Evaluation 8.1 Intr
Page 107 and 108: means: Q = L( X,s + b) L( , (8.5)
Page 109 and 110: computed from Equation 8.12 replaci
Page 111 and 112: Chapter 9 Conclusions A search for
Page 113 and 114: There are a total of 666236 γ+jets
Page 115 and 116: Appendix B Backgrounds to the 3ID a
Page 117 and 118: Appendix C Systematic Uncertainties
Page 119 and 120: References [1] J. L. Borges, Tres v
Page 121 and 122: [40] G. Lu, F. Yin, X. Wang and L.
Page 123 and 124: [82] ATLAS Collaboration, Expected
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