CPT noninvariance: a model for an initial lepton asymmetry due to unequal masses for lepton and antilepton

Abstract

A primary lepton-antilepton asymmetry provides the seed for the present empirical baryon-antibaryon asymmetry in a phenomenological model with a small, effectively spontaneous violation of CPT invariance at the origin. An experimentally accessible possibility is that the mass of a charged lepton, measured in the present era, can differ slightly from the mass of the antilepton, with a maximum possible difference at the level of (10 −9 - 10 −8). For electron and positron this is a mass difference with magnitude (0.001 - 0.01) eV, somewhat below the present empirical upper limit of 0.02 eV.