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 Heavy quarks Kaon physics always rich, θ − τ puzzle, P violation, C violation CP violation in 1964, Suppression of flavour-changing neutral currents led GIM (1970) to propose another Q = 2/3 quark, named “charmed” (c) Not too heavy to get the GIM mechanism working, Properties of charmed particles anticipated, in particular Gaillard, Lee and Rosner, Including (c¯q), (cqq), (ccq), . . . and (c¯c) JMR Quark Model
Few-charge systems History of the quark model Mesons Baryons Multiquarks and other exotics Outlook October 1974 revolution In November 1974, the J/ψ was discovered simultaneously at BNL and SLAC, in quite different experiments Lepton-pair production in hadronic collisions (Ting) e + e − collisions (Richter) Not recognised immediately, since extremely narrow, Eventually identified as (c¯c) Several other states (ψ ′ , χ, . . . ) seen Charmed mesons seen also (G. Goldhaber) As well as charmed baryons Note: double-charm baryons not yet confirmed! Beautiful confirmation of the charm prediction And asymptotic freedom, which make the Zweig rule more effective for J/ψ than for φ. JMR Quark Model
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An introduction to the quark model

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