Lee and Yang proposed Wu’s experiment to check whether parity is conserved during beta decay. According to Wikipedia, the experiment works because spin is reversed under a parity transformation.
However, it seems like spin shouldn’t be reversed under parity, because $$\vec{L}=\vec{r}\times \vec{p} = -(\vec{r})\times (-\vec{p}).$$ Why does Wikipedia, and some textbooks such as Griffiths, claim the spin is reversed under parity?
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