Particle Stories - Muon Edition

Muons belong to the lepton family, similar to electrons. They possess the same negative elementary charge as electrons but have a mass approximately 207 times greater. Currently considered point-like particles with no discovered internal structure, muons have a spin of 1/2. They are influenced by electromagnetic force, the weak interaction, and gravity, but do not participate in the strong interaction. As unstable particles, their average lifespan is about 2.2 microseconds, and they typically decay into an electron, an electron antineutrino, and a muon neutrino. Muons are among the particles generated when cosmic rays collide with Earth's atmosphere. Despite their very short lifespan, a significant number reach the Earth's surface due to relativistic time dilation. Because muons can penetrate matter relatively well, they are utilized in muon tomography to investigate structures that are difficult to observe directly, such as the interiors of pyramids or volcanoes. Furthermore, research involving precise measurements of the muon's magnetic moment and mass plays a crucial role in verifying the accuracy of the Standard Model and exploring the potential for new, undiscovered physical laws.