Higher fraction of K.E. converted into new particles VII The quark model of particle physics (i) The quark model Hundreds of new particles Similar to hundreds of new elements Periodic Table: repeated patterns elements are composed of atoms (protons etc) → Does a similar pattern exist for elementary particles? Gellmann (1961): arranged particles into patterns using group theory The eightfold way Predicts new particle mass and charge (Ω-); Detected 1963 Gellmann and Zweig (1964): particles contain more fundamental units? up, down strange quarks: fractional charges Quark model: meson = quark-antiquark pair hadron = 3 quarks (p = uud, n = = sss ) udd, Ω- Explains all properties of hadrons, resonances and stable particles (ii) the search for quarks
Higher fraction of K.E. converted into new particles VII The quark model of particle physics (i) The quark model Hundreds of new particles Similar to hundreds of new elements Periodic Table: repeated patterns → elements are composed of atoms (protons etc) Does a similar pattern exist for elementary particles? Gellmann (1961): arranged particles into patterns using group theory The eightfold way Predicts new particle (Ω-); mass and charge Detected 1963 Gellmann and Zweig (1964): particles contain more fundamental units? quarks: up, down strange fractional charges Quark model: meson = quark-antiquark pair hadron = 3 quarks (p = uud, n = udd, Ω- = sss ) Explains all properties of hadrons, resonances and stable particles (ii) the search for quarks
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