- #1
Lapidus
- 344
- 12
In some introductory QFT texts there is no mentioning of the LSZ formula, in others it takes a central place. Some authors draw Feynman diagrams and calculate S-matrix without ever bringing up correlation functions and the LSZ formula (which gives the relationship between S-matrix and correlation function).
Why is that so? What is gained by introducing correlation functions and the LSZ formula?
thanks
Why is that so? What is gained by introducing correlation functions and the LSZ formula?
thanks