Muon.com

Welcome to Muon.com

An elementary particle, a lifetime of teaching, and the physics and systems thinking behind both.

  1. A cosmic ray hits the upper atmosphere
  2. A pion decays into a muon
  3. Time dilation carries the muon to the ground
  4. It decays into an electron and two neutrinos

μ− → e− + νμ + ν̄e

At sea level, roughly one cosmic-ray muon passes through each square centimeter of a horizontal surface every minute.

What is a muon?