History, quark model and the SU(3)-symmetry

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Quark model • quarks come in 6 flavours up, down, strange, charm, bottom top, these are the six different kinds of quarks • according to the regularity of the leptons quarks show the same family structure ⎛ ⎜ ⎝ u d ⎞ ⎟ ⎠ , ⎛ ⎜ ⎝ c s ⎞ ⎟ ⎠ , ⎛ t ⎞ ⎜ ⎟ ⎝b ⎠ m m m u s b = 1, 5 to 4 MeV = = 80 to130 4. 1 to 4. 4 MeV GeV m m m = 4 to 8 MeV = 1. 15 to1. 35 GeV = ( 174. 3 ± 5. 1)GeV Simela Aslanidou 14.12.2006 d c t
Quark model Problems • non-observation of isolated quarks • discrepancy between predicted and experimental data on cross-sections • problem in constructing baryon wave functions (violation of the Pauli principle) Simela Aslanidou 14.12.2006
Page 1 and 2: QCD History, quark model and the SU
Page 3 and 4: History • up to the beginning of
Page 5 and 6: History • 1950´s Robert Hofstadt
Page 7 and 8: History • both, Gell-Mann and Zwe
Page 9 and 10: History • the method of the exper
Page 11 and 12: Concepts The proton is an extended
Page 13 and 14: Concepts invariant mass W² c² = P
Page 15 and 16: Inelastic scattering Displaying the
Page 17 and 18: Inelastic scattering d² σ dΩdE
Page 19: Quarks Existence of Quarks there is
Page 23 and 24: Necessity of the colour Quarks are
Page 25 and 26: Colour • in 1965 O.W.Greenberg in
Page 27 and 28: Colour The additive colour model Si
Page 29 and 30: Quark model • why are there three
Page 31 and 32: Simela Aslanidou 14.12.2006 Quark m
Page 33 and 34: Ratio of the cross section Comparis
Page 35 and 36: Gluons • gluons are the gauge bos
Page 37 and 38: SU(N) • group of the non-abelian
Page 39 and 40: SU(3) Why SU(3)-flavour? With the S
Page 41 and 42: The Baryon-Oktet Start from the fun
Page 43 and 44: References T. Muta, World Scientif

History, quark model and the SU(3)-symmetry

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