CLs upper limits (particle physics)

Particle physics is the study of the tiny pieces that make up all matter (including you!). In particle physics, some particles can only exist for a tiny amount of time. CLS upper limits are measurements used by scientists to determine how long these particles can exist. Basically, it tells us how long the particles last. The CLS stands for "collision-less damping," which means that even when the particles collide, they won't lose any energy. That's important for helping scientists understand how these particles work and behave!