Ae. Nelson et Mj. Strassler, REALISTIC SUPERSYMMETRIC MODEL WITH COMPOSITE QUARKS, Physical review. D. Particles and fields, 56(7), 1997, pp. 4226-4237
We describe a realistic, renormalizable, supersymmetric ''quindecuplet
'' model in which the top quark, left-handed bottom quark, and up-type
Higgs boson are composite, with a compositeness scale similar to 1-3
TeV. The top-quark-Higgs-boson Yukawa coupling is a dynamically genera
ted strong interaction effect, and is naturally much larger than any o
ther Yukawa coupling. The light-quark doublets and right-handed up-typ
e quarks are also composite but at higher energies; the hierarchy of q
uark masses and mixings is due to a hierarchy in the compositeness sca
les. Flavor-changing neutral currents are naturally suppressed, as is
baryon-number violation by Planck-scale dimension-five operators. The
model predicts that the most easily observable effects would be on b-q
uark physics and on the rho parameter. In particular, a small negative
Delta rho= -epsilon leads to Delta R-b> + 2 epsilon. There are effect
s on B-meson mixing and on flavor-changing neutral-current b-quark dec
ays to leptons which might be detectable, but not on b-->s gamma. The
model also suggests the supersymmetry-breaking mass for the right-hand
ed top squark might be considerably larger than that of the left-hande
d top squark.