$Z \to b {\bar b}$ in a composite model of fermions

Details $Z \to b {\bar b}$ in a composite model of fermions $Z \to b {\bar b}$ in a composite model of fermions

1996-04-09

arxiv.org/abs/hep-ph/9604271v2

Z.Phys. C74 (1997) 561-569

Physics

High Energy Physics

High Energy Physics - Phenomenology

Minor additions and rewordings.To appear in ZPC

Scientific paper

A composite model of fermions is proposed to explain the "anomaly" in $Z \rightarrow b {\bar b}$ and, to a lesser extent, in $Z \rightarrow c {\bar c}$. It contains a {\em nonsequential} fourth family whose mass of one member (the charge -1/3 quark) is constrained to be between 47 GeV and 49 GeV. The charge +2/3 quark is constrained to lie between 67 GeV and 107 GeV. This opens up the exciting prospect for near-future discoveries at LEP2 and possibly at the Tevatron.

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