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In particle physics, lepton number (historically also called lepton charge) [1] is a conserved quantum number representing the difference between the number of leptons and the number of antileptons in an elementary particle reaction. [2]
Similarly, the muons and their neutrinos are assigned a muon number of +1 and the tau leptons are assigned a tau lepton number of +1. The Standard Model predicts that each of these three numbers should be conserved separately in a manner similar to the way baryon number is conserved. These numbers are collectively known as lepton family numbers ...
[1] [2] To this day, it has not been found. [2] [3] [4] The discovery of neutrinoless double beta decay could shed light on the absolute neutrino masses and on their mass hierarchy (Neutrino mass). It would mean the first ever signal of the violation of total lepton number conservation. [5]
The tau (τ), also called the tau lepton, tau particle or tauon, is an elementary particle similar to the electron, with negative electric charge and a spin of 1 / 2 .Like the electron, the muon, and the three neutrinos, the tau is a lepton, and like all elementary particles with half-integer spin, the tau has a corresponding antiparticle of opposite charge but equal mass and spin.
) and n s̅ represents the number of strange antiquarks (s). This quantum number was introduced by Murray Gell-Mann. This definition gives the strange quark a strangeness of −1 for the above-mentioned reason. Charm (C): Defined as C = n c − n c̅, where n c represents the number of charm quarks (c) and n c̅ represents the number of charm ...
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where the two decay products in each process have opposite chirality, u is an up quark, d is a down antiquark, and e + is a positron. A Y boson would have the following three decay modes: [1]: 442 Y + → e + L + u R Y + → d L + u R Y + → d L + ν e R. where u is an up antiquark and ν e is an electron antineutrino.