Show that Eq. (16.10) is invariant under global (mathrm{U}(1)) rotations (psi(x) ightarrow e^{i alpha} psi(x)), where

Show that Eq. (16.10) is invariant under global \(\mathrm{U}(1)\) rotations \(\psi(x) \rightarrow e^{i \alpha} \psi(x)\), where \(\alpha\) is assumed to be independent of the spacetime coordinate \(x\). Find the corresponding conserved current.

Data from Eq. (16.10)

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L = (i - m) (Dirac spinor field),