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Alpha decay Beta decay Henri Bequerel Pierre and Marie Curie.

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Presentation on theme: "Alpha decay Beta decay Henri Bequerel Pierre and Marie Curie."— Presentation transcript:

1

2 Alpha decay

3 Beta decay

4 Henri Bequerel

5 Pierre and Marie Curie

6 electron n

7 W. Pauli -NEUTRINO- “ I invented a new Particle, which Will never be Seen! “

8 electron

9

10 Dear Radioactive Ladies and Gentlemen !

11 1956: discovery of the neutrino Savannah river reactor

12 (Fred Reines – Clyde Cowan)

13 n-capture by cadmium

14 Fermi interaction f Enrico Fermi

15

16 direct interaction ~ four fermions p n electron antineutrino beta decay

17 Parity conserved in strong and electromagnetic interactions

18 C. N. Yang T. D. Lee

19 Chien-Shiung Wu Experiment Columbia University

20 lefthanded fermion S= - 1/2 righthanded fermion S = + 1/2

21 weak interactions current-current interaction weak currents => lefthanded Feynman / Gell-Mann Marshak / Sudarshan

22 R. Marshak G. Sudarshan

23 maximal breaking of parity

24

25

26 weak bosons high mass mass generation ?

27

28 electro-magnetism

29 electroweak gauge theory gauge group SU(2) x U(1) doublet singlet

30 doublet singlet => neutrinos massless

31

32 Z => neutral current

33

34

35 Gargamelle bubble chamber

36

37

38 1975 => three different neutrinos

39 Standard - Theory

40 III II I

41 ??? weak bosons ???

42 SPS proton-antiproton collider

43

44 1984 Discovery of weak bosons

45

46 The first Z-boson, decaying into an electron and a positron

47 Carlo Rubbia

48 LEP

49

50

51 Masses of weak bosons ??????????

52

53

54 rotation symmetry

55 symmetry of rotation broken (spontaneous symmetry breaking)

56 spontaneous symmetry breaking field theory

57

58

59

60

61

62

63

64 Peter Higgs Erwin Schrödinger

65 Kibble Guralnik Hagen Englert Brout

66

67

68

69

70

71

72 Discovery of „Higgs“-particle ? ? ?

73 L3 I ATLAS CMS LHCb Alice

74

75

76 H

77

78

79 M(H) = 125,36 ±0,37(stat.) ±0,18 (syst.) GeV

80 one W or Z must be virtual, since M(H) < 2 M(W,Z)

81 flavor mixing quarks

82

83 83

84 ( u d s )( u u d ) s  u

85

86 Nicola Cabibbo 1963

87

88 strangeness changing term not observed in the experiments (decay of K-mesons) !!!

89 GIM – mechanism ( Glashow, Iliopoulos, Maiani ) c: charmed quark 1970

90

91 III II I

92

93

94

95 SU(2,L) x U(1) SU(2,L) x sU(2,R) x U(1)

96

97

98

99 III II I

100 6 leptons – 6 quarks 3 doublets

101 flavormixing

102 weak transitions

103

104 observed CKM – matrix (no phasees)

105

106

107 New parametrization:

108

109

110

111

112

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114

115

116

117

118

119 flavor mixing Leptons

120 6 leptons

121 massive neutrinos

122 flavormixing

123

124 Neutrino oscillations

125

126

127

128

129 observation

130

131 neutrino masses ( eV )

132 eV 0.05 eV

133 ??????????????? neutrino masses very small ???????????????

134

135

136

137 Neutrinoless Double Beta decay

138

139

140

141 Majorana neutrino mass: < 0.23 eV

142 Beyond Standard Theory ??????????

143 ? Grand Unification ? ? Gravity ? ? Supersymmetry ? ? String Theory ? ?…………………?


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