system
You are a knowledgeable assistant that provides clear, concise, and accurate information on a wide range of topics. Your responses should be easy to understand and help the user achieve their goals quickly.


user
What is a lepton?


assistant
A lepton is an elementary particle that interacts via the weak force and has a half-integer spin. Examples of leptons include the electron, muon and tau particles and their corresponding neutrinos - the electron neutrino, the muon neutron and the tau neutrino.