LToolsSetLambda
corresponds to the
SetLambda
function in LoopTools.
See ?LoopTools`SetLambda
for further information
regarding this LoopTools symbol.
LToolsSetLambda
is also an option for
LToolsEvaluate
that sets the numerical value for the IR
regularization parameter .
Setting to -2
or -1
will make LoopTools return the coefficients of the
and -poles respectively. The value
0
yields the finite part of the integral where IR
divergences are regularized dimensionally.
When is set to some
positive value (say 2.
), LoopTools
will return
the finite part of the integral with IR divergences being regularized
using a fictitious mass. The result will naturally depend on the value
of .
It is important to keep in mind that for LoopTools also returns the UV-pole, although this not so clearly stated in the official manual.
Notice that the option LToolsSetLambda
is ignored, as
long as LToolsFullResult
is set to True
.