lepton

Definitions

1. A coin used since ancient times in Greece, serving in modern times as one hundredth of a phoenix, a drachma, and a euro (as the Greek form of the Eurocent).
2. An elementary particle that has a spin of 1/2 (i.e., is a fermion) and does not interact via the strong nuclear force; examples include the electron, the muon, the neutrino and the tauon.
   particle
3. A small, bronze Judean coin from the 1st century BCE, considered by some to be the widow's mite.

Equivalents

Examples

“In the present⟳ paper we deal⟳ with the second order⟳ radiative correction to the beta disintegration of nucleon, assuming the Fermi's interaction between necleon and lepton fields, and show⟳ that there appears such an ultraviolet divergence as can not be removed by the procedure of renormalization of mass and coupling constant, so far as a single type⟳ of coupling is assumed for the decay Hamiltonian.”

CEFR level