Higher fraction of K.E. converted into new particles VII The quark model of particle physics (i) The eightfold way 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 S = -3: Q = -1: mass =1680 MeV/c2 (Ω-): Detected 1963 (ii) The quark model Gellmann and Zweig (1964): particles contain more fundamental units? up, down strange quarks:
Higher fraction of K.E. converted into new particles VII The quark model of particle physics (i) The eightfold way 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-): S = -3: Q = -1: mass =1680 MeV/c2 Detected 1963 (ii) The quark model Gellmann and Zweig (1964): particles contain more fundamental units? quarks: up, down strange
f2introduction-to-particle-physics2.docx