Symmetries in particle physics
Symmetries in particle physics
Symmetries in particle physics
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<strong>Symmetries</strong><br />
Sp<strong>in</strong>-1/2 systems<br />
Some generalities<br />
Sp<strong>in</strong>-1/2 systems are often studied <strong>in</strong> <strong>physics</strong>.<br />
Example: electron and its sp<strong>in</strong>, isosp<strong>in</strong>, ...<br />
Sp<strong>in</strong>-statistics theorem suggests that such systems<br />
are fermionic <strong>in</strong> nature.<br />
Interest<strong>in</strong>g <strong>in</strong> the context of this lecture:<br />
Basic build<strong>in</strong>g blocks of matter (quarks & leptons)<br />
are sp<strong>in</strong>-1/2.<br />
Simple representation:
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