QuarkPropagator[p]
is the massless quark propagator.
QuarkPropagator[{p, m}]
gives the quark propagator with mass .
QP
can be used as an abbreviation of QuarkPropagator
.
Overview, GluonPropagator, QuarkGluonVertex.
[p, Explicit -> True] QuarkPropagator
[{p, m}, Explicit -> True] QuarkPropagator
[{p, m}]
QP
[%] Explicit