ar X iv : h ep - p h / 92 07 24 8 v 1 2 0 Ju l 1 99 2 Flavour Democracy Calls for the Fourth Generation
نویسنده
چکیده
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 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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ar X iv : h ep - p h / 94 07 37 5 v 1 2 6 Ju l 1 99 4 Scaling Relation for Leptonic Constants of Higher Excitations in Heavy Quarkonium
Introduction
متن کاملar X iv : h ep - p h / 94 07 39 7 v 1 2 9 Ju l 1 99 4 Analysis of the anomalous events e + e − → l + l −
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ar X iv : h ep - p h / 98 07 20 1 v 2 3 1 Ju l 1 99 8 UM - P - 97 / 21 Fermion Masses and Mixing in 331 Models with Horizontal Symmetry
The possibility of adding an SU (2) horizontal symmetry to the 331 model is studied. It is found that simple, anomaly-free fermion assignments can be made which lead to plausible results for fermion masses and mixings. In particular, all particles of the first generation are massless at tree-level, and the CKM matrix acquires a realistic form.
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