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 Improvements: fine structure ψ ′ → χJ + γ , χJ → J/ψ + γ , Masses accurately measured with antiprotons analysed with to first order M( 3 P0) = Mt − 2 〈Vls〉 − 4 〈Vt〉 , M( 3 P1) = Mt − 〈Vls〉 + 2 〈Vt〉 , M( 3 P2) = Mt + 〈Vls〉 − 2 〈Vt〉 , 5 V (r) + Vss(r) σ1.σ2 + Vls(r) ℓ.s + Vt(r) S12 , Mt = 1 M( 9 3 P0) + 3 M( 3 P1) + 5 M( 3 P2) , 〈Vls〉 = 1 −2 M( 12 3 P0) − 3 M( 3 P1) + 5 M( 3 P1) , 〈Vt〉 = 5 2 M( 72 3 P0) − 3 M( 3 P1) + M( 3 P1) . JMR Quark Model
Few-charge systems History of the quark model Mesons Baryons Multiquarks and other exotics Outlook Improvements: fine structure 1P of (c¯c) Mt = 3.525 , 〈Vls〉 = 0.035 , and 〈Vt〉 = 0.010 GeV . 1P level of (b ¯ b), 2P Mt = 9.900 , 〈Vls〉 = 0.014 , and 〈Vt〉 = 0.003 GeV , ∗Mt = 10.260 , 〈Vls〉 = 0.009 , and 〈Vt〉 = 0.002 GeV . (1) JMR Quark Model
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An introduction to the quark model

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