Violation in Mixing

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ii 1.5.3 Hadronic charmless two-body � decays ...................... 40 1.5.3.1 � � � � ............................. 41 1.5.3.2 � � �Ã ............................... 44 1.5.4 Direct �È Violation ................................ 45 1.5.5 � Decays into Ã Ã ............................... 46 2 The BABAR Experiment 47 2.1 Physics at � � B Factory operating at the § �Ë resonance ................ 47 2.1.1 �È asymmetry experimental measure ....................... 47 2.1.2 PEP-II. ....................................... 49 2.2 The BABAR detector. ...................................... 51 2.2.1 The Silicon Vertex Tracker: ËÎÌ. ......................... 53 2.2.2 The drift chamber ��À. .............................. 57 2.2.3 The charged particle tracking system. ....................... 60 2.2.4 The Čerenkov-based detector �ÁÊ�. ....................... 63 2.2.5 The electromagnetic calorimeter �Å�. ...................... 67 2.2.6 The magnet and the muon and neutral hadron detector Á�Ê. ........... 70 2.2.7 The trigger. . . . .................................. 74 3 Ã Ë reconstruction and efficiency studies 77 3.1 Reconstruction . ....................................... 77 3.1.1 Ã Ë candidate lists available for the physics analyses ............... 77 3.2 Study on MC truth ...................................... 78 3.3 Studies on data . ....................................... 79 MARCELLA BONA 3.3.1 Data samples . . .................................. 80 3.3.2 Mass and Resolution Studies ............................ 81 3.3.3 Efficiency Studies ................................. 83 3.3.4 Correction for the Monte Carlo efficiencies . . . ................. 88 3.3.5 Run 2 data sample: first look at the Ã Ë reconstruction . . . ........... 90
4 Strategy and Tools for Charmless Two-body � Decays Analysis 97 4.1 Data samples . . ....................................... 97 4.2 Event selection . ....................................... 98 4.2.1 Topological Variables ................................100 4.2.2 � candidate selection: kinematic Variables . . . .................102 4.2.2.1 Control Sample � ¦ � � � ¦ ....................103 4.3 Background fighting . . . ..................................104 4.4 PID selection . . .......................................107 4.4.1 � � £ � control sample ............................107 4.4.2 Selector-based PID .................................109 4.5 Tracking Corrections . . . ..................................111 4.6 Analysis methods .......................................111 4.6.1 Sample definitions .................................112 4.6.2 Beam energy-substituted mass Ñ�Ë ........................113 4.6.3 Energy difference ¡� ...............................114 4.6.4 Fisher output � ...................................116 4.6.5 Pion and kaon � ..................................117 4.6.6 Correlations between PDFs . ............................119 5 Measurement of Branching Fractions for � ¦ � Ã � ¦ decays 121 5.1 Data samples and event selection . . . ............................121 5.2 Ã Ë reconstruction .......................................122 5.3 Analysis Strategy .......................................125 5.4 Background Suppression and PDF Parameterization .....................126 5.4.1 ¡� PDF and Definition of Signal and Side-band Regions . ...........126 5.4.2 Parameterizations of Ñ�Ë Distributions ......................128 5.4.3 Fisher Discriminant .................................128 5.4.4 Particle ID Selection ................................129 iii
Page 1 and 2: ÍÒ�Ú�Ö×�Ø��
Page 3: Contents Introduction . ...........
Page 7 and 8: 7.2 Branching fraction � � �
Page 9 and 10: Introduction The main goal of the B
Page 11 and 12: 1 �È Violation in the �� Sys
Page 13 and 14: 1.2 Neutral � Mesons 7 Note, howe
Page 15 and 16: 1.2 Neutral � Mesons 9 Applying t
Page 17 and 18: 1.2 Neutral � Mesons 11 �È �
Page 19 and 20: 1.2 Neutral � Mesons 13 ��
Page 21 and 22: 1.2 Neutral � Mesons 15 � ¡�
Page 23 and 24: 1.2 Neutral � Mesons 17 and � a
Page 25 and 26: 1.2 Neutral � Mesons 19 given tim
Page 27 and 28: 1.3 The Three Types of �È Violat
Page 33 and 34: 1.4 �È Violation in the Standard
Page 43 and 44: 1.5 Determination of « 37 1.5 Dete
Page 45 and 46: 1.5 Determination of « 39 Assuming
Page 47 and 48: 1.5 Determination of « 41 Figure 1
Page 49 and 50: 1.5 Determination of « 43 b q (a)
Page 51 and 52: 1.5 Determination of « 45 � �
Page 53 and 54: 2 The BABAR Experiment 2.1 Physics
Page 55 and 56:
2.1 Physics at � � B Factory op
Page 57 and 58:
2.2 The BABAR detector. 51 Integrat
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2.2 The BABAR detector. 53 The dete
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2.2 The BABAR detector. 55 two oute
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2.2 The BABAR detector. 57 SVT Effi
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2.2 The BABAR detector. 59 324 1015
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Efficiency 2.2 The BABAR detector.
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2.2 The BABAR detector. 63 2.2.4 Th
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entries per mrad 2.2 The BABAR dete
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2.2 The BABAR detector. 67 entries
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2.2 The BABAR detector. 69 energies
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2.2 The BABAR detector. 71 The main
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Efficiency 2.2 The BABAR detector.
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2.2 The BABAR detector. 75 Table 2-
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3 Ã Ë reconstruction and efficien
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3.3 Studies on data 79 19.5° BINS
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3.3 Studies on data 81 ¯ off-reson
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3.3 Studies on data 83 0.504 0.502
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3.3 Studies on data 85 0.03 0.025 0
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3.3 Studies on data 87 0.504 0.502
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3.3 Studies on data 89 N(π + π -
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3.3 Studies on data 91 0.508 0.506
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3.3 Studies on data 93 Figure 3-13.
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3.3 Studies on data 95 0.508 0.506
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4 Strategy and Tools for Charmless
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4.2 Event selection 99 channel sele
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4.2 Event selection 101 ÀÐ �
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4.2 Event selection 103 Figure 4-2.
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4.3 Background fighting 105 Figure
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4.4 PID selection 107 In the case o
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4.4 PID selection 109 θ c Cut Effi
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4.5 Tracking Corrections 111 Ë�
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4.6 Analysis methods 113 Ñ�Ë si
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4.6 Analysis methods 115 Events/2.5
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4.6 Analysis methods 117 Figure 4-1
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4.6 Analysis methods 119 θ c radia
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5 Measurement of Branching Fraction
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5.2 Ã Ë reconstruction 123 1 0.8
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5.3 Analysis Strategy 125 0.35 0.3
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5.4 Background Suppression and PDF
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Page 137 and 138:
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5.5 Maximum likelihood analysis 133
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Page 145 and 146:
Page 147 and 148:
Page 149 and 150:
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5.6 Counting analysis 145 Table 5-1
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5.7 Determination of branching frac
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6 Measurement of Branching Fraction
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6.3 The maximum likelihood analysis
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Page 161 and 162:
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6.4 Counting analysis 157 120 100 8
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6.5 Analysis choice 159 6.5 Analysi
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6.6 Results on the Run1 data-set 16
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6.7 Determination of the branching
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7 Analysis of the time-dependent
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7.3 Analysis strategy 167 Parameter
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7.4 Data samples and event selectio
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7.4 Data samples and event selectio
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7.5 Background characterization 173
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7.5 Background characterization 175
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7.8 Validation studies 185 Figure 7
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7.8 Validation studies 187 100 75 5
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7.8 Validation studies 189 Figure 7
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7.8 Validation studies 191 Paramete
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7.9 Results 193 Parameter Fit Resul
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7.9 Results 195 Events/2 MeV/c 2 Ev
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7.10 Systematic studies 197 Categor
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7.11 Summary 199 �Ã� Ë��
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7.11 Summary 201 �Ã� Ë��
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7.11 Summary 203 Variation �Ã�
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BIBLIOGRAFIA 205 Bibliografia Chapt
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BIBLIOGRAFIA 207 [38] J. Charles, P
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BIBLIOGRAFIA 209 Chapter 7 [67] D.
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Violation in Mixing

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