A gamma-matrix trace is a matrix trace of products of gamma matrices. In four spacetime dimensions, tr(γμγν)=4ημν and tr(γμγνγργσ)=4(ημνηρσ−ημρηνσ+ημσηνρ).
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- Fermion spin sum
- Gamma-matrix trace
- Massive vector-current annihilation kernel
- One-loop sextic cancellation in quartic Yukawa theory
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- Spin sum
- Squared-amplitude diagram
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