10 - H1 - Desy

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x Contents 4 Event reconstruction and preselection 51 4.1 Data overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51 4.2 Event reconstruction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53 4.2.1 Scattered electron identification . . . . . . . . . . . . . . . . . . . . 53 4.2.2 Jet algorithm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53 4.3 Triggering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54 4.3.1 Level 1 trigger . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54 4.3.2 Trigger efficiency . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56 4.3.3 Level 4 trigger . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59 4.4 Electron-proton interaction event selection . . . . . . . . . . . . . . . . . . 60 5 Prompt photon selection 63 5.1 Photoproduction event selection . . . . . . . . . . . . . . . . . . . . . . . . 63 5.2 Photon selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64 5.2.1 Cluster criteria . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64 5.2.2 Veto on charged particles . . . . . . . . . . . . . . . . . . . . . . . . 66 5.2.3 Neutral hadrons background . . . . . . . . . . . . . . . . . . . . . . 66 5.3 Exclusive selection and its subselections . . . . . . . . . . . . . . . . . . . . 68 5.4 Selection Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70 6 Photon signal extraction 73 6.1 Shower shape variables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73 6.1.1 Correlations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77 6.1.2 Separation power . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79 6.2 MVA MC samples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80 6.3 Classifier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81 7 Calibration and tuning 85 7.1 Cluster shapes tuning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85 7.2 Photon energy calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . 88 7.3 Hadronic energy calibration . . . . . . . . . . . . . . . . . . . . . . . . . . 90 7.4 Event class ratios . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91 8 Cross section building 95 8.1 Unfolding problem . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95 8.1.1 Regularisation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96 8.2 Unfolding application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99 8.2.1 Migration matrix . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99 8.2.1.1 Migration bins . . . . . . . . . . . . . . . . . . . . . . . . 102 8.2.1.2 Side bins . . . . . . . . . . . . . . . . . . . . . . . . . . . 102 8.2.1.3 Background bins . . . . . . . . . . . . . . . . . . . . . . . 105 8.2.2 Selection efficiency correction . . . . . . . . . . . . . . . . . . . . . 105 8.2.3 Regularisation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105 8.2.4 Covariance matrix redefinition . . . . . . . . . . . . . . . . . . . . . 106 8.2.5 Q 2 selection correction . . . . . . . . . . . . . . . . . . . . . . . . . 109 8.3 Error matrix evaluation . . . . . . . . . . . . . . . . . . . . . . . . . . . . 110
Contents xi 8.3.1 MC statistics error propagation . . . . . . . . . . . . . . . . . . . . 111 8.3.2 Systematic error propagation . . . . . . . . . . . . . . . . . . . . . 112 8.4 Cross section building . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 114 8.4.1 Bin averaging procedure . . . . . . . . . . . . . . . . . . . . . . . . 114 8.4.2 Error matrix interpretation . . . . . . . . . . . . . . . . . . . . . . 115 8.4.3 Cross sections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 116 8.5 Total cross section consistency check . . . . . . . . . . . . . . . . . . . . . 116 8.6 Toy Monte Carlo study . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 116 8.6.1 Fitting procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . 118 8.6.2 Toy MC results . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 120 8.7 Corrections to the QCD calculations . . . . . . . . . . . . . . . . . . . . . 122 8.7.1 Multi parton interaction correction . . . . . . . . . . . . . . . . . . 122 8.7.2 Isolation definition correction . . . . . . . . . . . . . . . . . . . . . 123 8.7.3 Hadronisation correction . . . . . . . . . . . . . . . . . . . . . . . . 124 8.7.4 Parton density function uncertainty . . . . . . . . . . . . . . . . . . 126 9 Results 129 9.1 Inclusive prompt photon production in photoproduction . . . . . . . . . . 129 9.2 Prompt photon + jet production in photoproduction . . . . . . . . . . . . 132 9.2.1 Photon - jet correlations . . . . . . . . . . . . . . . . . . . . . . . . 132 9.3 NLO corrections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 136 9.4 Intrinsic 〈k T 〉 study . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 139 9.5 Comparison to previous measurements . . . . . . . . . . . . . . . . . . . . 141 10 Conclusions and outlook 143 Appendices 145 A Analysis Binning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 147 B Alternative classifier definitions . . . . . . . . . . . . . . . . . . . . . . . . 150 C Cross Section Tables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 153 List of Figures 165 List of Tables 169 References 173
Page 1: PROMPT PHOTON PRODUCTION IN PHOTOPR
Page 5: Abstract This thesis presents measu
Page 8 and 9: viii
Page 12 and 13: xii Contents
Page 14 and 15: xiv Contents the two photon decay c
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Page 18 and 19: 2 Theoretical framework Gene- Quark
Page 20 and 21: 4 Theoretical framework charged W
Page 22 and 23: 6 Theoretical framework Neutral and
Page 24 and 25: 8 Theoretical framework α s 0.20 H
Page 26 and 27: 10 Theoretical framework 1.2.4.1 DG
Page 28 and 29: 12 Theoretical framework for the em
Page 30 and 31: 14 Theoretical framework F 2 ⋅ 2
Page 32 and 33: - - 2) 9O9O9 4 - 70 6- - 7 - Q-
Page 34 and 35: 18 Theoretical framework e e e a) b
Page 36 and 37: 20 Theoretical framework than in th
Page 38 and 39: 22 Theoretical framework ZEUS dσ/E
Page 40 and 41: 24 Theoretical framework claim thou
Page 42 and 43: 26 Theoretical framework Figure 1.2
Page 44 and 45: 28 Theoretical framework Inclusive
Page 46 and 47: 30 Theoretical predictions partons
Page 48 and 49: 32 Theoretical predictions 2.1.2 MC
Page 50 and 51: 34 Theoretical predictions rejectio
Page 52 and 53: MC set Generator Comments Simulatio
Page 54 and 55: 38 Theoretical predictions contribu
Page 56 and 57: 40 The H1 experiment at HERA Hall N
Page 58 and 59: 42 The H1 experiment at HERA y θ z
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44 The H1 experiment at HERA resolu
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46 The H1 experiment at HERA the el
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48 The H1 experiment at HERA under
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50 The H1 experiment at HERA not be
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52 Event reconstruction and presele
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64 Prompt photon selection the rema
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66 Prompt photon selection ∆η <
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68 Prompt photon selection reconstr
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70 Prompt photon selection Events 5
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72 Prompt photon selection Selectio
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74 Photon signal extraction γ π0
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76 Photon signal extraction Events
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78 Photon signal extraction CB1 CB2
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80 Photon signal extraction Figure
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82 Photon signal extraction n∏ va
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84 Photon signal extraction 〈S〉
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86 Calibration and tuning • Backg
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88 Calibration and tuning χ 2 /NDF
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90 Calibration and tuning energy on
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92 Calibration and tuning D Ej 1.1
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94 Calibration and tuning
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96 Cross section building The corre
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98 Cross section building • L-cur
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100 Cross section building (Reconst
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102 Cross section building 8.2.1.1
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104 Cross section building Figure 8
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106 Cross section building section
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108 Cross section building the Pull
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110 Cross section building contribu
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112 Cross section building 8.3.2 Sy
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114 Cross section building 8.4 Cros
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116 Cross section building 8.4.3 Cr
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118 Cross section building The doub
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120 Cross section building 8.6.2 To
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122 Cross section building one outp
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124 Cross section building MPI f th
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f f f f f f f f f f f f 126 Cross s
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128 Cross section building PDF unce
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130 Results description of the shap
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132 Results 9.2 Prompt photon + jet
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134 Results [pb] LO dσ / dx γ 100
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136 Results 9.3 NLO corrections The
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138 Results [pb/GeV] dσ / dp 15 10
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140 Results transverse momentum imb
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142 Results [pb/GeV] γ dσ / E T 2
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144 Conclusions and outlook is cons
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A Analysis Binning 147 A Analysis B
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A Analysis Binning 149 Bin E γ T,O
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B Alternative classifier definition
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C Cross Section Tables 153 C Cross
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C Cross Section Tables 155 η γ E
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C Cross Section Tables 157 η γ d
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C Cross Section Tables 159 η jet d
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C Cross Section Tables 161 x LO γ
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C Cross Section Tables 163 x LO γ
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List of Figures 1.1 Lowest order Fe
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List of Figures 167 6.2 Shower shap
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List of Tables 169 List of Tables 1
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List of Tables 171 C-8b Corrections
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References [1] C. Amsler et al.,
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References 175 [32] R. Nisius, “T
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References 177 [63] P. A. Aarnio et
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References 179 [97] W. Braunschweig
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References 181 [129] J. M. Butterwo
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