Dynamical symmetry breaking through preons and the sizes of composite quarks and leptons
1984; American Physical Society; Volume: 30; Issue: 5 Linguagem: Inglês
10.1103/physrevd.30.1144
ISSN1538-4500
Autores Tópico(s)Dark Matter and Cosmic Phenomena
ResumoIt is observed that the assumptions that quarks and leptons are composites and that they acquire masses dynamically through preonic condensates rather than through the vacuum expectation value of a Higgs field lead to a relatively low upper bound of only 1 to 3 TeV for the inverse size of the heaviest family---e.g., the $\ensuremath{\tau}$ family. It is furthermore stressed that the $e$ and $\ensuremath{\mu}$ families, within a large class of models, must, on the other hand, have a relatively large inverse size exceeding about 150 TeV; this is so in order that the limits from rare processes such as ${K}_{L}\ensuremath{\rightarrow}\stackrel{-}{\ensuremath{\mu}}e$ and ${K}^{0}\ensuremath{-}{\stackrel{-}{K}}^{0}$ may be satisfied. Certain theoretical and experimental implications of these two observations are noted.
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