An introduction to the quark model

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Few-charge systems History of the quark model Mesons Baryons Multiquarks and other exotics Outlook The fundamental representation: quarks Y d• •u • s I3 ū• Y • ¯s • ¯ d q b I I3 Y S Q 1 u 3 1 d 3 1 2 1 2 1 2 1 − 2 1 2 3 0 3 1 3 0 − 1 3 1 s 3 0 0 − 2 3 −1 2 3 JMR Quark Model I3
Few-charge systems History of the quark model Mesons Baryons Multiquarks and other exotics Outlook The aces φ Zweig was puzzled by φ(1020) decay Mostly into K ¯ K in spite of very little phase-space π ρ φ He interpreted as due to the content of the Φ and of final-state mesons, he named “aces”, But eventually the name “quark” prevailed, and here the notation (u, d, s), rather than (p, n, λ). π JMR Quark Model ρ φ K K
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