L3.1 Feynman Calculus: Introduction

Key Takeaways

welcome back to 8701 so we are going to start a new chapter in this class feinman calculus the purpose of this very first introduction is to just set the stage and we do this by recapping what we'll discuss so far in the first three weeks of this course so first we introduce the player in the field the elementary particles the meta particles and the force carriers um we have seen that there is regeneration of fermions that has leptons and quarks we have seen that they in principle interact in different ways um with those force carriers we have seen that there are three kinds of charges or three kinds of interactions um the electromagnetic interaction the weak interaction and the strong interaction um then we moved on and had a qualitative a quantitative discussion of relativistic kinematics uh so there's quite a set of useful problems we can look at for example we're wondering how much energy does my approacher need in a beam on a fixed target where we want to produce anti-protons so those problems we were able to discuss and quantitatively figure out what the answer's answers to those questions are then we looked at fireman diagram we are able to you know read them and understand what they principally mean and then we had a discussion last week on symmetries we introduced parity we introduced charge conjugation we looked at cp and cp violation we had a qualitative discussion on the case in scattering uh we defined what a geometrical cross section is and now we are really starting the quantitative discussion of particle dynamics we do this now in the next video by introducing femi's golden rule and then we study a toy theory which is simplified such that the algebra involved is not going to be too much of a hustle so we can focus on understanding or following findman rules in order to calculate the k rates and scattering cross sections