Symmetries in particle physics
Symmetries in particle physics
Symmetries in particle physics
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Discrete symmetries:<br />
Parity<br />
Parity violation<br />
Then the Cobalt undergoes a β-decay, emitt<strong>in</strong>g an<br />
electron and an anti-neutr<strong>in</strong>o. Wu found that most<br />
of the electrons would be emitted <strong>in</strong>to the positive<br />
z-direction.<br />
If the process is “mirrored”, the sp<strong>in</strong> of the nucleus<br />
po<strong>in</strong>ts along the negative z-axis, but the electrons<br />
would still be emitted <strong>in</strong>to the positive z-direction.<br />
This different behaviour is called axial-vector and<br />
vector for sp<strong>in</strong> and momentum (and respective<br />
similar quantities).
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