New posts in Feynman Diagrams

Why don't high-energy experimentalists ever include Faddeev-Popov ghosts in their Feynman diagrams?

Why do the counterterms in renormalized $\phi^4$-theory with power two in fields give vertices and not propagators?

What actually means to compute things at tree level?

Intuition behind Linked Cluster Theorem: connected vs. non-connected diagrams

Why does an electron react differently to a virtual photon in the interaction between two electrons and between an electron and a positron?

Cutkosky rules for a two-loop diagram

Why does normal ordering violate the Ward identity?

Quantum Field Theory in position space instead of momentum space?

Criterion for a Feynman loop diagram to give a finite value

Feynman diagram and uncertainty