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Introduction to Heavy Ion Physics

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8-th Summer School on Nuclear <strong>Physics</strong>, 3-12/07/12<br />

7<br />

Two puzzles in QCD: i) hadron masses<br />

• A pro<strong>to</strong>n is thought <strong>to</strong> be made of<br />

two u and one d quarks<br />

• The sum of their masses is around<br />

12 MeV<br />

beauty<br />

• ... but the pro<strong>to</strong>n mass is 938 MeV!<br />

• how is the extra mass generated?

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