FeynCalc manual (development version)

EpsilonIR

EpsilonIR denotes (D4)(D-4), where DD is the number of space-time dimensions.

EpsilonIR stands for a small negative number that explicitly regulates only IR divergences.

See also

Overview, Epsilon, EpsilonUV.

Examples

EpsilonIR

εIR\varepsilon _{\text{IR}}