5. Three quarks for Muster Mark! Sure he hasn't got much of a bark And sure any he has it's all beside the mark. But O, Wreneagle Almighty, wouldn't un be a sky of a lark To see that old buzzard whooping about for uns shirt in the dark And he hunting round for uns speckled trousers around by Palmerstown Park? Hohohoho, moulty Mark!

6. 6

11. quantum numbers of quarks

14. 14

16. 16

20. g Gell-Mann - Okubo mass formula

23. s s s

28. quark model triangle diagram - good agreement with experiment steinberger

29. factor 9 too small in decay rate

30. Elektromagnetic pion decay: color quantum number =>factor 3 in amplitude, factor 9 in rate - very good agreement between theory and experiment.

31. Electron – positron- annihilation

32. quark model:

33. b-flavored hadrons charmed hadrons R

34. quarks with color:

35. 35

37. deep inelastic scattering electron proton variables: Q 2 = 4 E E ’ sin 2  /2 x = Q 2 /2M p (E ’ – E) E E’ photon

38. 38

39. scaling behaviour of cross section

43. probability that a quark carries fraction  of parent proton ’ s momentum is q(  ) ( 0<  < 1 ), then

45. 45

46. current commutators near the light cone are abstracted from the free quark model explains scaling behaviour of cross sections

48. SU(3) x SU(2) u,d,s spin SU(6)

62. u, d, s,: light quarks Electron=positron annihilation: production of the J/psi resonance

67.  4 quarks

68. D(+): 1870 MeV D(0): 1865 MeV D(s): 1968 MeV Weak decays: cs,d

69. charmed baryons

71. b-quark: 1977 FNAL

72. FNAL

74. D( +): 18 70 M eV D( 0): 18 65 M eV D( s): 19 68 M eV Weak decays: cs,d B-mesons

75. b-flavored baryons

76.  6 quarks?