Download presentation
Presentation is loading. Please wait.
Published byDulcie Howard Modified over 9 years ago
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?
Similar presentations
© 2025 SlidePlayer.com Inc.
All rights reserved.