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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.

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Presentation on theme: "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."— Presentation transcript:

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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!

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11 quantum numbers of quarks

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20 g Gell-Mann - Okubo mass formula

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23 s s s

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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:

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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

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39 scaling behaviour of cross section

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

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

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

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

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67  4 quarks

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

69 charmed baryons

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71 b-quark: 1977 FNAL

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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?

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