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

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38 2. Neutrino physics tel-00821629, version 1 - 11 May 2013 Figure 2.12: Summary of current knowledge on neutrino oscillation in m 2 tan 2 ✓. PDG 2011 update [41]. Does not contain yet 2012 results on ✓ 13 .
In the next future, reactor experiments (Double CHOOZ and Daya Bay) and long baseline neutrino experiments (T2K and Nova) will continue the search for ✓ 13 , increasing the sensitivity of at least one order of magnitude with respect to the CHOOZ limit. 2.6 Summary and open questions 39 tel-00821629, version 1 - 11 May 2013 Figure 1.10: Figure Normal 2.13: and The inverted normal and neutrino inverted mass neutrino orderings. mass hierarchy. The di The erent di↵erent colors show from colours show the weights of the flavour mixing for a given mass eigenstate. left to right the relative weights of the di erent flavor eigenstates (⌫ e , ⌫ µ and ⌫ ⌧ ) in a given mass eigenstate. • The matter e↵ect 2 could be used in long baseline experiment to measure the sign of m 2 23 and establish the neutrino mass hierarchy. As If a non zeroshown ✓ 13 will in be Fig. discovered 2.13, a positive many new (negative) measurements m 2 in the neutrino physics will 23 imply the neutrino be possible: separated by the atmospheric mass splitting is heavier (lighter) than the neutrinos separated by the solar mass splitting. In case of normal hierarchy, m • the CP violating phase 2 23 > can 0, the be matter measured e↵ect would in long-baseline enhance the ⌫ µ $ ⌫ experiments, e oscillations while suppressing the ¯⌫ studying di erences in the oscillation probability for µ $ ¯⌫ neutrinos e . In case of inverted hierarchy, and antineutrinos, P (⌫ µ ! ⌫ e ) 6= m 2 23 < 0, the opposite would happen. P (⌫ µ ! ⌫ e ) • A combination of reactor ¯⌫ e disappearance and both accelerator ⌫ µ disappearanceit and will ⌫ e appearance be possiblewould to use discriminate the oscillations the sign ofin ✓ 23 • with long baselines the⇡/4. matter to discriminate the Thesign degeneracy of mon 2 23. the The measurement sign of mof 2 23✓ 23 establishes at accelerator theexperiment mass hierarchy of the neutrinos. will A positive be broken by m 2 the 23 means reactorthat ✓ 13 measurement the neutrinos which separated does notby depend the atmospheric mass splitting on ✓ 23 are . Such heavier measurement than those would separated allow to discriminate by the solar themass fraction splitting of (normal hierarchy) ⌫ while µ and a⌫ ⌧ negative contained bym the 2 23 indicates mass statethe ⌫ 3 . opposite situation (inverted hierarchy). Beyond In the case neutrino of normal oscillation, hierarchy, is then necessary m 2 23 > to 0, measure the matter the absolute e ects enhance mass ⌫ µ $ ⌫ e oscillations, of the neutrinos, suppressing their ⌫ µ Dirac $ ⌫ e or while Majorana in thenature case and m 2 23 to< confirm 0 the opposite or reject will happen; the existence of a fourth sterile neutrino. 2 Not discussed in this chapter for brevity, but available e.g. in [97]. 23
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 29 and 30: After the Sun, the other main natur
Page 35 and 36: 2.5 The problem with the neutrino m
Page 37: 2.6 Summary and open questions 37 s
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 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
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4.3 Backgrounds 89 energy spectrum
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4.3 Backgrounds 91 tel-00821629, ve
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4.4 Selection e ciencies and system
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4$&14+#':"'$"$468'#21%$;' ! $"$468'
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4.4 Selection ! e ciencies and syst
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4.5 Data analysis summary 99 4.4.3
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4.6 Final fit and measurement of
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4.6 Final fit and measurement of
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4.7 Summary and Conclusions 105 tel
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Chapter 5 Correlated background tel
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5.1 Measuring correlated background
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5.2 High energy analysis 111 in a l
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5.2 High energy analysis 113 tel-00
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5.3 OV Tag analysis 115 The t cut v
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5.4 Fast Neutrons analysis 117 bigg
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5.4 Fast Neutrons analysis 119 5.4.
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5.4 Fast Neutrons analysis 121 tel-
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5.4 Fast Neutrons analysis 123 esti
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5.4 Fast Neutrons analysis 125 Corr
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5.4 Fast Neutrons analysis 129 Prom
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5.4 Fast Neutrons analysis 131 lect
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5.4 Fast Neutrons analysis 133 mari
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5.5 Stopping Muon analysis 139 5.5.
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5.5 Stopping Muon analysis 141 tel-
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5.5 Stopping Muon analysis 143 tel-
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5.5 Stopping Muon analysis 145 Sour
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5.5 Stopping Muon analysis 147 belo
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5.5 Stopping Muon analysis 149 The
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5.6 Estimation of correlated backgr
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5.7 Conclusion 157 5.7 Conclusion t
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Chapter 6 Conclusions tel-00821629,
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161 • The SM analysis could be im
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Chapter 7 Contributions to Double C
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165 from this study and from [64] f
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List of Figures tel-00821629, versi
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LIST OF FIGURES 169 tel-00821629, v
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List of Tables 3.1 Mean energy rele
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Bibliography [1] [2] tel-00821629,
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BIBLIOGRAPHY 183 [31] J.K. Ahn et a
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BIBLIOGRAPHY 185 [61] W. Hampel et
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BIBLIOGRAPHY 187 [92] A. Stueken et
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