under construction
operator product expansion (OPE) in QFT-s (especially in CFT)
Mantra in the case of perturbative QFTs: perturbative QFTs are about the deformation theory controlled by certain L-infinity algebra which is constructed from OPE-s
In perturbative quantum field theory:
Stefan Hollands, Heiner Olbermann, Perturbative Quantum Field Theory via Vertex Algebras, J. Math. Phys. 50:112304, 2009 (arXiv:0906.5313)
Jan Holland, Stefan Hollands, Operator product expansion algebra, J. Math. Phys. 54, 072302 (2013) (arXiv:1205.4904)
Brief survey is at