Flavour democracy calls for the fourth generation |
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Authors: | Amitava Datta |
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Institution: | (1) Physics Department, Jadavpur University, 700 032 Calcutta, India |
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Abstract: | It is argued with the help of an illustrative model, that the inter species hierarchy among the fermion masses and the quark
mixing angles can be accommodated naturally in the standard model with (approximate) flavor democracy provided there are three
exactly massless neutrinos and four families of sequential quark-leptons with all members of the fourth family having roughly
equal masses. The special problem of light neutrino masses (if any) and possible solutions are also discussed. |
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Keywords: | Fermion mass hierarchy CKM matrix: fourth generation flavour democracy neutrino mass problem |
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