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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 />

Chromoelectric binding: string potential<br />

The good surprise is that this potential gives better binding than<br />

<strong>the</strong> simple additive <strong>model</strong>,<br />

Hence, (cc¯q¯q), marginally bound in <strong>the</strong> additive <strong>model</strong>, should<br />

be stable with this improved <strong>quark</strong> dynamics<br />

Hence, beyond double-charm baryons, one could look at double<br />

charm mesons, a genuine exotic,<br />

For instance, since e + e − → J/ψ + ηc is observed (double charm<br />

production), TQQ + ¯ D + ¯ D + · · · could be observed.<br />

JMR Quark Model

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