= Spin phase in the Dirac time-reversal matrix
The matrix in <time reversal of a Dirac field> depends on the convention for the spin-flip phases and on the sign of the spinor identity used when relabeling the <mode expansion of a Dirac field>. If $\epsilon_s=(-1)^{1/2-s}$ and $\epsilon_su^{-s*}(p_T)=-\gamma^5Cu^s(p)$, the relabelled coefficient is $\epsilon_{-s}u^{-s*}(p_T)=\gamma^5Cu^s(p)$, giving $B=\gamma^5C$. A common phase changes $B$ but leaves its <gamma matrix> conjugation property and the induced <fermion bilinear> transformation unchanged. The <antiunitary operator> acts on both numerical coefficients and creation or annihilation operators.
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