introduced concepts of multiplicity

In physics, multiplicity refers to the number of identical particles, such as photons or electrons, present in a system or event. For example, in a collision, multiplicity indicates how many particles are produced or involved. High multiplicity means many particles are created or detected simultaneously, often implying complex interactions. Understanding multiplicity helps scientists analyze particle behavior, energy distributions, and underlying physical processes, offering insights into the fundamental nature of matter and forces in the universe.