Abstract
Two new flavor quantum numbers D and U for down and up quarks, respectively, are introduced, and then quark quantum number H is proposed as the sum of the flavor quantum numbers of quarks. Moreover, lepton quark-like quantum number HL and finally fermion quantum number F are brought forward. Old and new additive quantum numbers are conserved at three different levels in weak interaction, and F builds up a clear relationship to the electric charge of fermions.
Highlights
Is conserved in weak interaction including only part of fermions; at the first level, F is conserved in weak interaction including all fermions
It is well-known that conservation of one quantum number corresponds to one type of gauge symmetry
Because conservation of F is conserved in electromagnetic interaction, strong interaction and weak interaction, including all fermions, F corresponds to fermion gauge symmetry in all interactions
Summary
Each of generation of quarks includes one u-type quark and one d-type quark. I, I3 , B and four flavor quantum numbers are additive quantum numbers. The other additive quantum numbers are conserved in strong interaction, but not conserved in weak interaction. Leptons have the Lepton quantum number L which is equal to +1 for all six flavors of leptons, and −1 for all antileptons. L is an additive quantum number and conserved in weak interaction. It has been noticed that quarks and leptons have different additive quantum numbers and, except for B, additive quantum numbers of quarks are not conserved in weak interaction. Some new additive quantum numbers of quarks are introduced, leptons and fermions, and the corresponding conservations, are investigated
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