Introduction to Heavy Ion Physics
Introduction to Heavy Ion Physics
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?