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 First complications: resonances New baryons: ∆, N ∗ , etc., in πN scattering, New mesons: ρ, ω, σ produced, and also required, and even anticipated for describing nuclear forces, Bootstrap, or Nuclear Democracy, ∆ = πN + · · · , and similarly N = π∆ + πN + ρ∆ + · · · , etc. Everything made of everything, Partial success, but intricate coupled equations Difficulty to accommodate mesons as baryon+antibaryon + . . . , (Ball, Scotti and Wong), in particular exchange degeneracy (m(I = 1) m(I = 0) Next baryon predicted to be J = 5/2 and I = 5/2 JMR Quark Model
Few-charge systems History of the quark model Mesons Baryons Multiquarks and other exotics Outlook Another complication: strangeness New particles produced by pairs with strict rules, e.g., Λ with K + but not with K − and decaying with similar rules or weakly, A new quantum number was empirically invented, strangeness, which is conserved by strong interactions (production, strong decay) violated by weak interactions weak decay linked to ordinary β decay (Gell-Mann, Lévy, Cabbibo) JMR Quark Model
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An introduction to the quark model

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