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

More documents

Recommendations

Info

Source Background Signal Luminosity ±4% ±4% Electron trigger −3 % ±1% Electron reconstruction +1 −2 % ±1% Electron identification +4 −6 % Electron energy scale +3 −6 % ±1% Electron energy resolution ±7% ±1% +5 +1 −2 % Muon trigger ±3% ±1% Muon reconstruction +1 −4 % < 1% Muon identification ±1% < 1% Muon energy scale +5 −3 % ±1% Muon energy resolution ±5% < 1% Jet energy scale + 9 −12 % ±2% Jet reconstruction ±5% ±2% Jet energy resolution ±1% ±3% Cell-Out and Soft-Jet ±4% ±1% LAr readout problem +2 −4 % ±1% Pile-up % < 1% +5 −2 Top quark mass < 1% −2 % σt¯t < 1% + 7 −10 % ISR/FSR < 1% ±3% PDFs — ±3% WZ and ZZ modelling ±33% — WZ and ZZ cross section ±4% — Total ±38% ±12% Table C.1: Absolute values of the relative changes o the expected number of background events and signal yields for different sources of systematic uncertainties for the 3ID analysis. The contributions from the WZ and ZZ generator apply only to the simulated background samples. The ± values refer to the upper and lower systematic shifts respectively. 105 +1
References [1] J. L. Borges, Tres versiones de Judas (Three versions of Judas), Ficciones (1994). [2] CDF and D0 Collaboration, Combination of CDF and D0 results on the mass of the top quark using up to 5.8 fb −1 of data, FERMILAB-TM-2504-E, [arXiv:1107.5255]. [3] F. del Aguila, J. A. Aguilar-Saavedra and R. Miquel, Constraints on top couplings in models with exotic quarks, Phys. Rev. Lett. 82 (1999) 1628, [hep-ph/9808400]. [4] D0 Collaboration, Search for flavor changing neutral currents in decays of top quarks, Phys. Lett. B 701 (2011) 313-320, [arXiv:1103.4574]. [5] CDF Collaboration, A Measurement of the t¯t Cross Section in p¯p Collisions at √ s = 1.96 TeV using Dilepton Events with a Lepton plus Track Selection, Phys. Rev. D 79 (2009) 112007, [arXiv:0903.5263]. [6] ATLAS Collaboration, Measurement of the top quark pair production cross section in pp collisions at (s) = 7 TeV in dilepton final states with ATLAS, Phys. Lett. B 707 (2012) 459-477, [arXiv:1108.3699]. [7] ATLAS Collaboration, Measurement of the cross section for top-quark pair production in pp collisions at √ s = 7 TeV with the ATLAS detector using final states with two high-pT leptons, JHEP 1205 (2012) 059, [arXiv:1202.4892]. [8] ATLAS Collaboration, A search for flavour changing neutral currents in top-quark decays in pp collision data collected with the ATLAS detector at √ s = 7 TeV, Submitted to JHEP (2012), [arXiv:1206.0257]. [9] CDF Collaboration, Evidence for Top Quark Production in ¯pp Collisions at √ s = 1.8 TeV, Phys. Rev. Lett. 73 (1994) 225-231, [hep-ex/9405005]. Phys. Rev. D50, 2966-3026 (1994). [10] CDF Collaboration, Observation of Top Quark Production in ¯pp Collisions, Phys. Rev. Lett. 74 (1995) 2626-2631, [hep-ex/9503002]. [11] D0 Collaboration, Observation of Top Quark, Phys. Rev. Lett. 74 (1995) 2632-2637, [hep-ex/9503003]. [12] S. L. Glashow, Partial Symmetries of Weak Interactions, Nucl. Phys. 22 (1961) 579-588. [13] A. Salam and J. C. Ward, Electromagnetic and Weak Interaction, Phys. Lett. 13 (1964) 168. [14] A. Salam, Weak and electromagnetic interactions, in “Elementary Particle Theory”, ed N. Svartholm, Stockholm (1968). [15] S. Weinberg, A model of Leptons, Phys. Rev. Lett. 19 (1967) 1264-1266. [16] F. Halzen and A. D. Martin, Quarks and Leptons : An Introductory Course in Modern Particle Physics, New York, NY, Wiley (1984). [17] D. H. Perkins, Introduction to High Energy Physics, 4th Edition. Cambridge Univ. Press (2000). [18] C. Quigg, Gauge theories of the strong, weak, and electromagnetic interactions, Reading, MA, Addison- Wesley (1983). 106
Page 1 and 2:
CERN-THESIS-2012-153 26/07/2012 c
Page 3 and 4:
Abstract A search for flavor-changi
Page 5 and 6:
Acknowledgments I first want to tha
Page 7 and 8:
Table of Contents List of Tables .
Page 9 and 10:
List of Tables 2.1 The fundamental
Page 11 and 12:
List of Figures 2.1 The potential V
Page 13 and 14:
5.15 Distributions of the 3ID analy
Page 15 and 16:
This thesis is organized as follows
Page 17 and 18:
the question whether each neutrino
Page 19 and 20:
gauge invariant field strength tens
Page 21 and 22:
for strong interactions. Although W
Page 23 and 24:
particles. Because of the introduct
Page 25 and 26:
which is introduced for mass genera
Page 27 and 28:
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 and 80: event kinematics, however no b-jet
Page 81 and 82: Events / 10 GeV trackleptons / 10
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: Appendix C Systematic Uncertainties
Page 121 and 122: [40] G. Lu, F. Yin, X. Wang and L.
Page 123 and 124: [82] ATLAS Collaboration, Expected
show all

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

You also want an ePaper? Increase the reach of your titles

Delete template?

Save as template?