10 - H1 - Desy

More documents

Recommendations

Info

92 Calibration and tuning D Ej 1.1 1.05 a. b. D Ej 1.1 before calibration 1.05 after calibration 1 1 0.95 0.95 0.9 6 8 <strong>10</strong> 12 14 16 18 20 γ E T 0.9 6 8 <strong>10</strong> 12 14 16 18 20 γ E T D Ej 1.1 1.05 c. d. before calibration D Ej 1.1 1.05 after calibration 1 1 0.95 0.95 0.9 -1 -0.5 0 0.5 1 1.5 2 γ η 0.9 -1 -0.5 0 0.5 1 1.5 2 γ η Figure 7.7: Double ratio plots as a function of transverse energy of photon candidate E γ T (a, b) and its pseudorapidity ηγ (c, d). Plots show situation before the calibration (a, c) and after calibration (b, d). Horizontal lines show the evaluated 2% error on the MC description of hadronic energy. criteria 0.7 < z < 0.9). In such a phase space, the prompt photon signal contributes on the negligible level and the background samples may be scaled to the measured data distribution. Figure 7.8a presents the x jet γ distribution together with the fitted direct and resolved background MCs. Significant difference between both distributions can be observed, which allows a meaningful fit. A good description of the data by the sum of scaled background MC can be noted as well. The background direct MC must be scaled by a factor 5.46, and the resolved component by 1.71. One should though keep in mind that due to preselection of the isolated neutral particle on the generator level (see section 2.1.2) those scaling factors do not have much meaning outside of the analysis presented in this particular thesis. The background scaling factors, with the assumption of the cluster shapes insensitivity to event class, is important only for the next step of the event class ratio tuning. • Tuning signal event class ratios The signal event class ratio determination is more complicated, as it is not easy to obtain pure enough signal event sample. The signal enhanced selection follows the standard inclusive prompt photon selection with an additional cut on the discriminator (D > 0.7). In this way the influence of the background is minimised, but still can not be fully neglected. The x jet γ distribution together with two fitted components (direct and resolved prompt photons) and a fixed background distribution is shown in figure 7.8b. The background in this case was fixed to the scales obtained
7.4 Event class ratios 93 in the previous step. One may see that in this particular selection phase space, background and resolved signal components have a similar distribution and can not be simultaneously fitted. The fitted scaling factor for a direct prompt photon sample is equal to 1.18 ± 0.03, while the resolved component needs a higher scaling of 1.57 ±0.08. One should note that what influences the final measurement is only the relative direct to resolved scale. The uncertainty of the fitted scales were used for the evaluation of the systematic error associated with the effect explained above. Events 800 600 a. b. MC Sum Direct Resolved Events 600 400 MC Sum Background Direct Resolved 400 200 200 0 0 0.2 0.4 0.6 0.8 1 jet x γ 0 0 0.2 0.4 0.6 0.8 1 jet x γ Figure 7.8: Event class ratios in the background enhanced phase space (a) and signal enhanced phase space (b).
Page 1:
PROMPT PHOTON PRODUCTION IN PHOTOPR
Page 5:
Abstract This thesis presents measu
Page 8 and 9:
viii
Page 10 and 11:
x Contents 4 Event reconstruction a
Page 12 and 13:
xii Contents
Page 14 and 15:
xiv Contents the two photon decay c
Page 16 and 17:
xvi Contents
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
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 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
Page 128 and 129: 112 Cross section building 8.3.2 Sy
Page 130 and 131: 114 Cross section building 8.4 Cros
Page 132 and 133: 116 Cross section building 8.4.3 Cr
Page 134 and 135: 118 Cross section building The doub
Page 136 and 137: 120 Cross section building 8.6.2 To
Page 138 and 139: 122 Cross section building one outp
Page 140 and 141: 124 Cross section building MPI f th
Page 142 and 143: f f f f f f f f f f f f 126 Cross s
Page 144 and 145: 128 Cross section building PDF unce
Page 146 and 147: 130 Results description of the shap
Page 148 and 149: 132 Results 9.2 Prompt photon + jet
Page 150 and 151: 134 Results [pb] LO dσ / dx γ 100
Page 152 and 153: 136 Results 9.3 NLO corrections The
Page 154 and 155: 138 Results [pb/GeV] dσ / dp 15 10
Page 156 and 157: 140 Results transverse momentum imb
Page 158 and 159:
142 Results [pb/GeV] γ dσ / E T 2
Page 160 and 161:
144 Conclusions and outlook is cons
Page 163 and 164:
A Analysis Binning 147 A Analysis B
Page 165 and 166:
A Analysis Binning 149 Bin E γ T,O
Page 167 and 168:
B Alternative classifier definition
Page 169 and 170:
C Cross Section Tables 153 C Cross
Page 171 and 172:
C Cross Section Tables 155 η γ E
Page 173 and 174:
C Cross Section Tables 157 η γ d
Page 175 and 176:
C Cross Section Tables 159 η jet d
Page 177 and 178:
C Cross Section Tables 161 x LO γ
Page 179 and 180:
C Cross Section Tables 163 x LO γ
Page 181 and 182:
List of Figures 1.1 Lowest order Fe
Page 183 and 184:
List of Figures 167 6.2 Shower shap
Page 185 and 186:
List of Tables 169 List of Tables 1
Page 187 and 188:
List of Tables 171 C-8b Corrections
Page 189 and 190:
References [1] C. Amsler et al.,
Page 191 and 192:
References 175 [32] R. Nisius, “T
Page 193 and 194:
References 177 [63] P. A. Aarnio et
Page 195 and 196:
References 179 [97] W. Braunschweig
Page 197 and 198:
References 181 [129] J. M. Butterwo
show all

10 - H1 - Desy

Create successful ePaper yourself

Delete template?

Save as template?