1 / 124

of quarks and leptons

flavor mixing. of quarks and leptons. quarks * leptons. reduced by 80 %. N. Cabibbo 1963 ( Cabibbo angle ). hypothesis: new (fourth) quark „charm“. 1970 GIM – mechanism ( Glashow, Iliopoulos, Maiani ). c: charmed quark.

sachi
Télécharger la présentation

of quarks and leptons

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. flavor mixing of quarks and leptons quarks * leptons

  2. reducedby 80 %

  3. N. Cabibbo 1963 ( Cabibbo angle )

  4. hypothesis:new (fourth) quark „charm“

  5. 1970GIM – mechanism( Glashow, Iliopoulos, Maiani ) c: charmed quark

  6. November 1974: discoveryofthecharmedquark

  7. SLAC J/PSI e(+) e(-) M= 3.1 GeV

  8. SLAC MIT November 1974

  9. - flavor mixing angles fermion masses

  10. - - III 2 families flavor mixing II I

  11. (Cabibbo angle)

  12. mass matrices texture 0 u,c - d,s H. Fritzsch S. Weinberg 1978

  13. texture zeros in the electroweak gauge group SU(2,L) x SU(2,R) x U(1)

  14. SU(2,L) x SU(2,R) x U(1) grand unification SO(10)

  15. U(1) x U(1) symmetry

  16. - ==> mass matrix

  17. - mixing angles <=> masses

  18. Cabibbo angle Exp.: phase 90 degrees ( symmetry ! )

  19. Cabibbo angle ==>

  20. 1977: Fermilabb-quark

  21. CDF – detector Fermilab

  22. M(b) : ~ 4.2 GeV

  23. 1995 - FNAL t mass (t): 172.0±2.2 GeV

  24. - III 3 families II I

  25. Masses - Charged leptons and quarks (MeV) tau: 1 777 muon: 105.7 electron: 0.51 - t: 173 000 c: 1 200 u: 5.3 b: 4 300 s: 130 d: 7.8 (u, d, c, s - quark masses at 1 GeV)

  26. relations between quark masses ? • Observed: m(c) : m(t) = m(u):m(c) 1/207 1/207 m(s):m(b) = m(d):m(s) 1/23 1/23

  27. ln m

  28. - flavor mixing => CKM - matrix: three angles - one phase

  29. CKM matrix standard parametrization

  30. New parametrization: H. F. - Z. Xing

  31. - texture zeros:

  32. -

  33. - The angles and can be measured separately.

  34. SLAC DESY KEK FNAL CERN

  35. theory - x x theory -

  36. - unitarity triangle

  37. - - -

  38. Cabibbo angle Unitarity triangle (rectangular)

  39. Experiment:alpha 89.0 + 4.1/-4.2 degrees

  40. - Maximal CP-violation

  41. Unitaritytriangle:

  42. flavor mixing leptons

More Related