FermionSpinSum

Description

FermionSpinSum[x] constructs the Traces out of squared ampliudes.

Options[FermionSpinSum]

See also:  ComplexConjugate, DiracTrace, Tr.

Examples

t = Spinor[k1, m] . DiracSlash[p] . GA[5] . Spinor[p1, m]

Notice that SpinorUBar and SpinorU are only input functions. Internally they are converted to Spinor objects.

ct = ComplexConjugate[t]

FermionSpinSum[t ct]

%  /. DiracTrace -> Tr

Clear[t,  ct]