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Quark Theory

Quark Theory. 1960s - Only 4 Leptons, but Hundreds of Hadrons Leptons seemed elementary/small (<10 -18 m) Not all Hadrons could be elementary – SLAC experiments showed an internal structure Murray Gell-Mann (b. 1929) suggests that Hadrons are made from quarks .

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Quark Theory

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  1. Quark Theory • 1960s - Only 4 Leptons, but Hundreds of Hadrons • Leptons seemed elementary/small (<10-18 m) • Not all Hadrons could be elementary – SLAC experiments showed an internal structure • Murray Gell-Mann (b. 1929) suggests that Hadrons are made from quarks. • "three quarks for Muster Mark" • -James Joyce • (Finnegan’s Wake)

  2. 12 total particles/anti-quarks are opposite Fractional charge Baryons vs. Mesons Held together by gluons – what happens when you separate

  3. Quark Theory Proton: +1 charge, B = 1 Neutron: 0 charge, B = 1 +: +1 charge, B = 0 -: -1 charge, B = 0 K-: -1 charge, B = 0 You should memorize the composition of n and p, You will always be given meson compositions

  4. u u

  5. u u B S q

  6. Mesons are quark anti-quark pairs

  7. Truly Fundamental particles Generally accepted fundamental particles Three generations Top quark = 173.1 GeV/c2 Higgs Boson…

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