= Pauli spinor
{c}
{title2=$\psi=(\psi_\uparrow,\psi_\downarrow)^T$}
A two-component complex <wave function> describing the two spin states of a nonrelativistic spin-$1/2$ particle. Under a spatial rotation by angle $\theta$ about $\widehat{\mathbf n}$ it transforms as $\psi\mapsto e^{-i\theta\widehat{\mathbf n}\cdot\boldsymbol\sigma/2}\psi$, with <Pauli matrices> $\boldsymbol\sigma$. A <Pauli spinor> may describe a massive particle; two components alone do not imply the massless <Weyl equation>.
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