Feynman propagator

Feynman propagator

[′fīn·mən ′präp·ə‚gād·ər]
(quantum mechanics)
A factor (ρ + m)/ (ρ2 - m 2 + i ε) in a transition amplitude corresponding to a line that connects two vertices in a Feynman diagram, and that represents a virtual particle.
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References in periodicals archive ?
E] replaced by the energy-momemtum four-vector k which is similar to the Feynman propagator (with a mass-energy parameter [[lambda].
The Feynman propagator of a massive scalar particle (inverse of the Klein-Gordon operator) [([D.
where we have introduced a momentum scale [mu] to match units in the Feynman propagator expression, and the Bergman Kernel [K.