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An introduction to the quark model

An introduction to the quark model

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Few-charge systems His<strong>to</strong>ry of <strong>the</strong> <strong>quark</strong> <strong>model</strong> Mesons Baryons Multi<strong>quark</strong>s and o<strong>the</strong>r exotics Outlook<br />

Level order<br />

M (GeV)<br />

10.2<br />

9.8<br />

9.4<br />

-<br />

-<br />

-<br />

3S<br />

2S<br />

1S<br />

2P<br />

1P<br />

1D<br />

Breaking of Coulomb<br />

degeneracy guided by <strong>the</strong><br />

sign of ∆V<br />

See alkalin a<strong>to</strong>ms vs. muonic<br />

a<strong>to</strong>ms<br />

Breaking of harmonic<br />

oscilla<strong>to</strong>r degeneracy<br />

according <strong>to</strong> <strong>the</strong> sign of<br />

JMR Quark Model<br />

d 2 V [r 2 ]<br />

d (r 2 ) 2

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