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We consider a model in which each family transforms under a different SU(3)color group. The low-energy effective theory is an extension of the StandardModel, with additional color octet gauge bosons $G_H$ with mass $M$ that couplepreferentially to the third family quarks. We show that there are two distinctregions of the model's parameter space in which we can simultaneously evade allthe current experimental constraints, one with $M \approx 250$ GeV and theother with $M \gtrsim 600$ GeV. Within each allowed region, we can obtain acorrection to the $Zb\overline{b}$ vertex that is consistent with the slightlyhigh value of $R_b$ observed at LEP. We show that there are $\Delta B = 1$operators in our model that can suppress the $B$-meson semileptonic branchingratio $B_{SL}$ and the charm multiplicity per decay $n_c$ by enough toreconcile the spectator parton model predictions with the experimental data. Inthe non-supersymmetric version of our model, we can only obtain the desiredcorrections to $R_b$, $B_{SL}$ and $n_c$ in different regions of the allowedparameter space, while in the supersymmetric version, we can obtain all threecorrections simultaneously. We also discuss a strong-coupling limit of ourmodel in which the third-family quarks become composite.Comment: LaTeX File, 24 pp., 3 Figures (in a uuencoded, compressed PostScript  file

physical review. d. particles, fields, gravitation, and cosmology/physical review. d. particles and fields

Third-family flavor physics in an SU(3<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mo>)</mml:mo></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msup></mml:mrow></mml:math>×SU(2<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mo>)</mml:mo></mml:mrow><mml:mrow><mml:mi mathvariant="italic">L</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math>×U(1<mml:math xmlns:mml="…

Third-family flavor physics in an SU(3)3×SU(2)L×U(1