Loop integral

In mathematical physics, particularly in the context of quantum field theory and string theory, a "loop integral" refers to an integral over a loop in momentum space, which arises when calculating certain types of Feynman diagrams during the process of evaluating quantum amplitudes. ### Key Points about Loop Integrals: 1. **Feynman Diagrams**: Loop integrals occur in Feynman diagrams that contain loops, indicating virtual particles that propagate between interactions.