Operator Product Expansion

The Operator Product Expansion (OPE) is a tool in quantum physics that simplifies the behavior of particles colliding at very high energies. When two particles come close together, their interactions can be complex, but OPE allows physicists to express this interaction as a sum of simpler terms involving known quantities called operators. This expansion helps to analyze and predict outcomes of particle interactions in quantum field theories by breaking down complex short-distance phenomena into more manageable components, making it easier to understand the fundamental forces at play.