10 - H1 - Desy

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62 Event reconstruction and preselection events and five to cosmic muon events. Background finders cause the estimated signal selection efficiency drop by roughly 4%, caused mostly by COSLAR finder. Further details can be found in [112,113]. Finder HALAR HAMULAR HAMUMU HAMUIF HASPALAR COSMUMU COSMULAR COSTALAR COSTRACK COSLAR Description Pure LAr “halo“ longitudinal horizontal pattern Relaxed LAr “halo“ pattern matching a deposit inside the Backward Iron Endcap. Horizontal forward muon matching a deposit inside the Packward Iron Endcap. Isolated inner forward LAr energy matching a deposit inside the Backward Iron Endcap. Isolated inner forward LAr energy matching a deposit inside SPACAL. Two opposite muon tracks of comparable direction. LAr energy matching the direction of a muon track. LAr energy matching the direction of two opposite Tail-Catcher clusters. Two CJC tracks with directions exactly opposite in space. “Long“ isolated LAr cluster with a small electromagnetic energy content. Table 4.4: Definitions of ten topological non-ep background finders considered as “safe“.
Chapter 5 Prompt photon selection Having the data selected as descibed in chapter 4, the prompt photon selection in photoprodiction is performed and described in this chapter. Section 5.1 discusses cuts used to obtain highly pure photoproduction event sample. Prompt photon (section 5.2) and hadronic jet (section 5.3) selection details are given later. The whole selection is summarised in section 5.4. 5.1 Photoproduction event selection Experimentally, photoproduction events are identified with a scattered electron escaping through the beam pipe. Hence they can be identified by applying a veto on directly measured scattered electron in the SPACAL or LAr calorimeter. This restricts the virtuality to Q 2 < 4 GeV for the HERA II setup. Identification of the scattered electron has been described in section 4.2.1. An electron candidate can simultaneously be identified as a prompt photon candidate, particularly in the forward region of the detector, where no track veto is applied to the photon selection (see section 5.2.2). Since electrons scattered under such wide angle are rare, the majority of those clusters are valid photon candidates (see section 5.2). For this reason, the LAr calorimeter electron veto is applied only if the electron candidate does not fulfil the photon selection criteria. Since the scattered electron escapes the detection, the event kinematics is calculated using the Jaquet-Blondel method [114]. The inelasticity y is reconstructed as ∑ (E − pz ) y = (5.1) 2E e where the sum runs over energy and longitudinal momentum of all final state particles and E e denotes energy of the electron beam. The characteristics of quantity ∑ (E − p z ) is, that it is by definition insensitive to particle losses in the forward direction where large losses are expected from proton remnant. For events with the electron scattered into the acceptance of the detector the inelasticity tends to be close to one. In order to decrease
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PROMPT PHOTON PRODUCTION IN PHOTOPR
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Abstract This thesis presents measu
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viii
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x Contents 4 Event reconstruction a
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xii Contents
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xiv Contents the two photon decay c
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xvi Contents
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2 Theoretical framework Gene- Quark
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4 Theoretical framework charged W
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6 Theoretical framework Neutral and
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8 Theoretical framework α s 0.20 H
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10 Theoretical framework 1.2.4.1 DG
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Page 30 and 31: 14 Theoretical framework F 2 ⋅ 2
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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
Page 60 and 61: 44 The H1 experiment at HERA resolu
Page 62 and 63: 46 The H1 experiment at HERA the el
Page 64 and 65: 48 The H1 experiment at HERA under
Page 66 and 67: 50 The H1 experiment at HERA not be
Page 68 and 69: 52 Event reconstruction and presele
Page 80 and 81: 64 Prompt photon selection the rema
Page 82 and 83: 66 Prompt photon selection ∆η <
Page 84 and 85: 68 Prompt photon selection reconstr
Page 86 and 87: 70 Prompt photon selection Events 5
Page 88 and 89: 72 Prompt photon selection Selectio
Page 90 and 91: 74 Photon signal extraction γ π0
Page 92 and 93: 76 Photon signal extraction Events
Page 94 and 95: 78 Photon signal extraction CB1 CB2
Page 96 and 97: 80 Photon signal extraction Figure
Page 98 and 99: 82 Photon signal extraction n∏ va
Page 100 and 101: 84 Photon signal extraction 〈S〉
Page 102 and 103: 86 Calibration and tuning • Backg
Page 104 and 105: 88 Calibration and tuning χ 2 /NDF
Page 106 and 107: 90 Calibration and tuning energy on
Page 108 and 109: 92 Calibration and tuning D Ej 1.1
Page 110 and 111: 94 Calibration and tuning
Page 112 and 113: 96 Cross section building The corre
Page 114 and 115: 98 Cross section building • L-cur
Page 116 and 117: 100 Cross section building (Reconst
Page 118 and 119: 102 Cross section building 8.2.1.1
Page 120 and 121: 104 Cross section building Figure 8
Page 122 and 123: 106 Cross section building section
Page 124 and 125: 108 Cross section building the Pull
Page 126 and 127: 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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10 - H1 - Desy

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