Etude et impact du bruit de fond corrÃ©lÃ© pour la mesure de l'angle ...

More documents

Recommendations

Info

136 5. Correlated background Source stat. bkg. ✏ IV T ✏ t ⇢ t total [%] [%] [%] [%] [%] [%] Uncertainty 9.5 62.1 15.1 1.3 8.2 65.1 Table 5.9: Break down of statistical and systematic uncertainties. Fit const. slope 2 /dof R FN (R FN )/R FN model [1/(3 MeV)] [1/(3 MeV) 2 ] [cpd] [%] tel-00821629, version 1 - 11 May 2013 Flat 33.5 ± 4.7 – 9.4/9 0.54 ± 0.07 14 Slope 10.7 ± 15.1 1.5 ± 0.9 7.3/8 0.33 ± 0.16 48 Table 5.10: Summary of FN spectral parameter and FN background rate for the flat and the sloped linear model. summarised in Tab. 5.10. The flat linear model gives 2 /ndf =9.4/9 and a fit probability of ⇠ 40 %, while the sloped linear model gives 2 /ndf =7.3/8 and a fit probability of ⇠ 50 %. Since the sloped linear model shown a better agreement with the data, it is assumed as FN spectral shape. A total rate of (0.33 ± 0.16) cpd is found. The rate relative uncertainty of ⇠ 50 % is in agreement with the expected total error estimated in Tab. 5.9. 5.4.5 Systematics uncertainty on the IVT threshold The IVT sample and its related background have been obtained by moving the multiplicity condition from 2 PMT hits to 4 and 6 PMT hits. The results obtained with 4 and 6 PMT hits are shown in Fig. 5.20 and summarised in Tab. 5.11. Increasing the multiplicity threshold the tagging e ciency decrease, then the number of tagged events and the expected background decrease. The spectral shape does not change by changing the IVT condition. The FN rate change up to 25 %, however, such increase is within uncertainty. The choice of the tag multiplicity threshold do not change FN rate and shape results, suggesting the systematical uncertainties related to the IVT strategy are negligible.
5.4 Fast Neutrons analysis 137 tel-00821629, version 1 - 11 May 2013 Figure 5.20: IVT spectrum and related background for for di↵erent IVT multiplicity condition. Increasing the multiplicity threshold the tagging efficiency decrease, then the number of tagged events and the expected background decrease. The IVT spectra upon background subtraction are fitted with a sloped linear models. The spectral shape does not change by changing the IVT condition. The FN rate change up to 25 %, however, such increase is within uncertainty. Tag thr. evt. ¯⌫ e +IV /n ✏ IV T rate evt. evt. Mult. 2 110 3 19 33 ± 5% 0.33 ± 0.16 d 1 Mult. 4 84 2 8 25 ± 4% 0.44 ± 0.17 d 1 Mult. 6 72 1 6 23 ± 4% 0.41 ± 0.16 d 1 Table 5.11: Number of IVT events, background events, IVT e ciency (✏ IV T ) and FN rate for di↵erent IVT multiplicity condition.
Page 1 and 2:
UNIVERSITÉ DENANTES FACULTÉ DES S
Page 3 and 4:
tel-00821629, version 1 - 11 May 20
Page 5 and 6:
Abstract tel-00821629, version 1 -
Page 7 and 8:
Acknowledgments Since so many peopl
Page 9 and 10:
Contents 1 Introduction 13 tel-0082
Page 11 and 12:
CONTENTS 11 tel-00821629, version 1
Page 13 and 14:
Chapter 1 Introduction tel-00821629
Page 15 and 16:
15 tel-00821629, version 1 - 11 May
Page 17 and 18:
Chapter 2 Neutrino physics tel-0082
Page 19 and 20:
2.2 Neutrino history in brief 19 ma
Page 21 and 22:
2.3 Neutrino oscillation, the theor
Page 23 and 24:
2.4 Measuring neutrino oscillation
Page 25 and 26:
3-flavour oscillations The dominant
Page 27 and 28:
Page 29 and 30:
After the Sun, the other main natur
Page 31 and 32:
Page 33 and 34:
Page 35 and 36:
2.5 The problem with the neutrino m
Page 37 and 38:
2.6 Summary and open questions 37 s
Page 39 and 40:
In the next future, reactor experim
Page 41 and 42:
Chapter 3 The Double Chooz experime
Page 43 and 44:
3.1 The Double Chooz detector 43 to
Page 45 and 46:
3.1 The Double Chooz detector 45 te
Page 47 and 48:
3.1 The Double Chooz detector 47 it
Page 49 and 50:
3.1 The Double Chooz detector 49 te
Page 51 and 52:
3.2 The detector read-out 51 40 m o
Page 53 and 54:
3.3 The online system 53 IV trigger
Page 55 and 56:
3.3 The online system 55 tions as s
Page 57 and 58:
3.3 The online system 57 tel-008216
Page 59 and 60:
3.4 The calibration system 59 tel-0
Page 61 and 62:
loosing their kinetic energy 3 and
Page 63 and 64:
3.5 Reactor neutrino flux simulatio
Page 65 and 66:
Page 67 and 68:
Page 69 and 70:
3.8 Data reconstruction 69 A dedica
Page 71 and 72:
Regarding the pulse information, th
Page 73 and 74:
3.8 Data reconstruction 73 tel-0082
Page 75 and 76:
3.8 Data reconstruction 75 Gain (ch
Page 77 and 78:
3.9 Conclusions 77 tel-00821629, ve
Page 79 and 80:
Chapter 4 Measurement of ✓ 13 wit
Page 81 and 82:
4.1 Data sample 81 create a signal
Page 83 and 84:
4.2 ¯⌫ e signal selection 83 Liv
Page 85 and 86: 4.2 ¯⌫ e signal selection 85 Pro
Page 87 and 88: 4.2 ¯⌫ e signal selection 87 Neu
Page 89 and 90: 4.3 Backgrounds 89 energy spectrum
Page 91 and 92: 4.3 Backgrounds 91 tel-00821629, ve
Page 93 and 94: 4.4 Selection e ciencies and system
Page 95 and 96: 4$&14+#':"'$"$468'#21%$;' ! $"$468'
Page 97 and 98: 4.4 Selection ! e ciencies and syst
Page 99 and 100: 4.5 Data analysis summary 99 4.4.3
Page 101 and 102: 4.6 Final fit and measurement of
Page 103 and 104: 4.6 Final fit and measurement of
Page 105 and 106: 4.7 Summary and Conclusions 105 tel
Page 107 and 108: Chapter 5 Correlated background tel
Page 109 and 110: 5.1 Measuring correlated background
Page 111 and 112: 5.2 High energy analysis 111 in a l
Page 113 and 114: 5.2 High energy analysis 113 tel-00
Page 115 and 116: 5.3 OV Tag analysis 115 The t cut v
Page 117 and 118: 5.4 Fast Neutrons analysis 117 bigg
Page 119 and 120: 5.4 Fast Neutrons analysis 119 5.4.
Page 121 and 122: 5.4 Fast Neutrons analysis 121 tel-
Page 123 and 124: 5.4 Fast Neutrons analysis 123 esti
Page 125 and 126: 5.4 Fast Neutrons analysis 125 Corr
Page 127 and 128: 5.4 Fast Neutrons analysis 127 tel-
Page 129 and 130: 5.4 Fast Neutrons analysis 129 Prom
Page 131 and 132: 5.4 Fast Neutrons analysis 131 lect
Page 133 and 134: 5.4 Fast Neutrons analysis 133 mari
Page 135: 5.4 Fast Neutrons analysis 135 tel-
Page 139 and 140: 5.5 Stopping Muon analysis 139 5.5.
Page 141 and 142: 5.5 Stopping Muon analysis 141 tel-
Page 143 and 144: 5.5 Stopping Muon analysis 143 tel-
Page 145 and 146: 5.5 Stopping Muon analysis 145 Sour
Page 147 and 148: 5.5 Stopping Muon analysis 147 belo
Page 149 and 150: 5.5 Stopping Muon analysis 149 The
Page 151 and 152: 5.6 Estimation of correlated backgr
Page 157 and 158: 5.7 Conclusion 157 5.7 Conclusion t
Page 159 and 160: Chapter 6 Conclusions tel-00821629,
Page 161 and 162: 161 • The SM analysis could be im
Page 163 and 164: Chapter 7 Contributions to Double C
Page 165 and 166: 165 from this study and from [64] f
Page 167 and 168: List of Figures tel-00821629, versi
Page 169 and 170: LIST OF FIGURES 169 tel-00821629, v
Page 179 and 180: List of Tables 3.1 Mean energy rele
Page 181 and 182: Bibliography [1] [2] tel-00821629,
Page 183 and 184: BIBLIOGRAPHY 183 [31] J.K. Ahn et a
Page 185 and 186: BIBLIOGRAPHY 185 [61] W. Hampel et
Page 187:
BIBLIOGRAPHY 187 [92] A. Stueken et
show all

Etude et impact du bruit de fond corrÃ©lÃ© pour la mesure de l'angle ...

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

Delete template?

Save as template?