FeynCalc manual (development version)

SpinorChainEvaluate

SpinorChainEvaluate[exp] explicitly evaluates suitable spinor chains, i.e. it replaces a DOT[Spinor[...],...,Spinor[...]] with a scalar quantity without a DOT.

See also

Overview

Examples

ex = SpinorUBar[p, m] . SpinorU[p, m] 
 
SpinorChainEvaluate[ex]

uˉ(p,m).u(p,m)\bar{u}(p,m).u(p,m)

2m2 m

SpinorChainEvaluate[ex, DiracSpinorNormalization -> "Nonrelativistic"]

mp0\frac{m}{p^0}

SpinorChainEvaluate[ex, DiracSpinorNormalization -> "Rest"]

11

ex = SpinorUBarD[p, m] . GA[5] . SpinorUD[p, m] 
 
SpinorChainEvaluate[ex]

uˉ(p,m).γˉ5.u(p,m)\bar{u}(p,m).\bar{\gamma }^5.u(p,m)

00

FCSetDiracGammaScheme["BMHV"] 
 
SpinorChainEvaluate[ex]

BMHV\text{BMHV}

(φ(p,m)).γˉ5.(φ(p,m))(\varphi (p,m)).\bar{\gamma }^5.(\varphi (p,m))