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 Simplest quarkonium model “Funnel” potential V (r) = −a/r + b r + c Constituent mass mc Minimal adjustment mc ∼ 1.5, a ∼ 0.4, b ∼ 0.2, and c ∼ −0.35 (all units in powers of GeV) ur ,V r 2 1 1 2 3 1 2 3 4 5 6 7 Reproduces also (b ¯ b) with mb ∼ 4.5 GeV JMR Quark Model r
Few-charge systems History of the quark model Mesons Baryons Multiquarks and other exotics Outlook Simplest quarkonium model c¯c b ¯ b 1S 2S 1P 1D 1S 2S 1P 1D 2P Model 3.07 3.68 3.48 3.78 9.47 9.99 9.87 10.11 10.23 exp. 3.07 3.67 3.52 3.77 9.44 10.01 9.89 10.16 10.26 In particular, the hierarchy of excitations (radial vs. orbital) corresponds to the observation. JMR Quark Model
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An introduction to the quark model

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