lepton number
(redirected from Lepton family number)Also found in: Dictionary.
Related to Lepton family number: antilepton, tau leptons
lepton number
[′lep‚tän ‚nəm·bər] (particle physics)
A conserved quantum number, equal to the number of leptons minus the number of antileptons in a system.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.