FeynCalc manual (development version)

FCShowEpsilon

FCShowEpsilon[expr] substitutes SMP["Delta"] with 1/Epsilon - EulerGamma + Log[4 Pi].

See also

Overview, FCHideEpsilon.

Examples

SMP["Delta"] 
 
FCShowEpsilon[%]

Δ\Delta

1εγ+log(4π)\frac{1}{\varepsilon }-\gamma +\log (4 \pi )

SMP["Delta_UV"] 
 
FCShowEpsilon[%]

ΔUV\Delta _{\text{UV}}

1εUVγ+log(4π)\frac{1}{\varepsilon _{\text{UV}}}-\gamma +\log (4 \pi )

SMP["Delta_IR"] 
 
FCShowEpsilon[%]

ΔIR\Delta _{\text{IR}}

1εIRγ+log(4π)\frac{1}{\varepsilon _{\text{IR}}}-\gamma +\log (4 \pi )