1In high energy physics, the lepton number is the number of leptons [Leptons are a family of elementary particles, alongside quarks and gauge bosons (also known as force carriers). Like quarks, leptons are fermions (spin-1â„2 particles) and are subject to the electromagnetic force, the gravitational force, and weak interaction, but unlike quarks, leptons do not participate in the strong interactions] minus the number of antileptons.
In equation form,N=n-n
so all leptons have assigned a value of +1, antileptons −1, and non-leptonic particles 0. Lepton number (sometimes also called lepton charge) is an additive quantum number, which means that its sum is preserved in interactions
