Question

3. Why must the electron be a stable fundamental particle? See G. Feinberg and M. Goldhaber, Proc. Natl Acad. Sci. USA 45, 1201 (1959). Hint: What particles are lighter than electrons and what are their charges? Section 29

Answer 1

Electron is a fundamental particle because it cannot be subdivided into any further smaller particle. The electron stable because it cannot decay to any further other particle. This is because there are no charged particle which are lighter than electen. Election in the lightest charged particle known fill date. The election in a stable particle, Ib lifetime is 6.6 X10 28 years. They can only decay by neutralizing a positron to gamma radiations. Till date there are no changed particles which are lighter than electron. However we do have neutral particles called neutrinae which can be lighter than electron Also we have platous, which are also neutral, and they do not possess any rest mats. (moro for plestons)