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Teilchenphysik – ohne Beschleuniger und Kosmologie Wiederholung zum 24.5.07 Sommersemester 2007.

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Presentation on theme: "Teilchenphysik – ohne Beschleuniger und Kosmologie Wiederholung zum 24.5.07 Sommersemester 2007."— Presentation transcript:

1 Teilchenphysik – ohne Beschleuniger und Kosmologie Wiederholung zum Sommersemester 2007

2 Hartmut Abele, University of Heidelberg 2 Correlation measurements in -decay Electron Proton Neutrino Neutron Spin A B C Observables in neutron decay: Lifetime Spin Momenta of decay particles Observables in neutron decay: Lifetime Spin Momenta of decay particles n p e e a D R N

3 Hartmut Abele, University of Heidelberg 3 Coefficient A Coefficient A and lifetime determine V ud and Electron Neutron Spin Electron Neutron Spin A W( )={1+ v/c PA cos( )} = g A /g V No coincidences !

4 Hartmut Abele, University of Heidelberg 4 A as a function of g A and g V Time reversal invariance, phase 180° gAgA gVgV Coefficient A and lifetime determine V ud and = g A /g V

5 Hartmut Abele, University of Heidelberg 5

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8 8 3. Origin of natures lefthandedness Standard Model: Elektroweak interaction 100% lefthanded Grand unified theories: Universe was left-right symmetric at the beginning Parity violation = 'emergent' Order parameter <100% Neutron decay: Correlation B + A: Mass right handed W-Boson: m R > 280 GeV/c2 Phase: < < 0.07

9 Hartmut Abele, University of Heidelberg 9 Parity violation: spontaneous symmetry breaking 2 bosons (W 1, W 2 ) in the symmetric base; W 2 very heavy SM: = 0, m W2 = Why do we measure B? Manifest Left Right Symmetric Models [eg: PRL 38, 22 (1977)]

10 Hartmut Abele, University of Heidelberg 10

11 Hartmut Abele, University of Heidelberg 11 Right handed current contributions, (2.4),.

12 Hartmut Abele, University of Heidelberg 12

13 Hartmut Abele, University of Heidelberg 13

14 Hartmut Abele, University of Heidelberg 14 Right Handed Currents? Exclusion Plot 3 Observables A, B and for 3 parameters, m 1 /m 2,, B A SM current situation (PDG 2004) B=0.983(4) B=0.983(2)

15 Hartmut Abele, University of Heidelberg 15 weitere Größen: jenseits des SM -Masse für ein rechtshändiges W-Boson -Mischungswinkel -rechts links -skalare schwache Kopplung -tensorielle schwache Kopplung -Fiertz-Interferenzamplitude -Second Class Currents -Neutrinohelizität <

16 Hartmut Abele, University of Heidelberg 16 Herczeg, Gudkov

17 Hartmut Abele, University of Heidelberg 17 Decay into hydrogen and the origin of natures lefthandedness n H+, BR Examine hyperfine state population wrong neutrino helicity state!

18 Hartmut Abele, University of Heidelberg 18 Find the Parameters… J.D. Jackson et al.: Phys. Rev. 106 (1957) 517 Surviving in the SM: Slide from T. Soldner

19 Hartmut Abele, University of Heidelberg 19 Find the Parameters… or T violation beyond SM Test for right handed currents Slide from T. Soldner


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