| Lepton number - Wikipedia, the free encyclopedia (Site not responding. Last check: 2007-11-07) |
 | | Lepton number (sometimes also called lepton charge) is an additive quantum number, which means that its sum is preserved in interactions (compared to multiplicative quantum numbers as parity, where the product is preserved instead). |
 | | The lepton number before the reaction is 0 (the neutron, n, is a baryon and therefore there are no leptons before), while the lepton number after the reaction is 0 for the proton +1 for the electron (a lepton) −1 for the antineutrino (an antilepton). |
 | | Because lepton number conservation law in fact is violated by chiral anomalies, there are problems applying this symmetry universally over all energy scales. |
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