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 Mesons: Content The quark–antiquark model of mesons Content Quantum numbers Spin-averaged spectrum Improvements Summary for heavy quarkonia Light mesons Heavy-light mesons Strong decay Some mathematical developments I married them Friar Laurence, Romeo and Juliet JMR Quark Model
Few-charge systems History of the quark model Mesons Baryons Multiquarks and other exotics Outlook Quantum numbers Consider symmetric quarkonia Q ¯ Q Spin of quarks S, orbital momentum ℓ, spin of the meson J, parity P and charge conjugation C Lowest quarkonium states 2 s+1ℓJ 1S0 3S1 1P1 3P0 3P1 3P2 1D2 3D1 3D2 3D3 JPC 0−+ 1−− 1 +− 0 ++ 1 ++ 2 ++ 2−+ 1−− 2−− 3−− Remarks Some quantum numbers are absent, e.g., J PC = 1 −+ Some J PC occur twice. For instance 1 −− may be a combination of 3 S1 and 3 D1 In addition, radial number. Here, notation n = 1, 2, . . .. For instance, ηc is ηc(1S) or 1 1 S0 η ′ c is ηc(2S) or 2 1 S0 JMR Quark Model
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An introduction to the quark model

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