Some phenomenological aspects of the SU(2)q x SU(2)l x U(1)Y model.

Abstract

We examine the implications of the recently proposed un-unified $\mathrm{SU}{(2)}_{q}\ifmmode\times\else\texttimes\fi{}\mathrm{SU}{(2)}_{l}\ifmmode\times\else\texttimes\fi{}\mathrm{U}{(1)}_{Y}$ model for the extra-gauge-boson decay widths and hadronic production rates, the ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}{\ensuremath{\mu}}^{+}{\ensuremath{\mu}}^{\ensuremath{-}}$ and $b\overline{b}$ asymmetries, the $B$-meson semileptonic branching fraction, ${B}^{0}\ensuremath{-}{\overline{B}}^{0}$ mixing, and the $\mathrm{CP}$-violating parameter $\ensuremath{\epsilon}$. A perturbative requirement gives the bound $sin\ensuremath{\varphi}\ensuremath{\gtrsim}0.22$ on the new mixing angle. Current searches at the Fermilab Tevatron collider for an extra $Z$ boson can place a mass bound ${M}_{{Z}_{H}}\ensuremath{\gtrsim}250$ GeV. The hadronic decays of ${W}_{H}$, ${Z}_{H}$ produced in $\overline{p}p$ collisions may be observable as enhancements in the two-jet invariant-mass distribution. The enhanced low-energy nonleptonic interaction improves the agreement with experiment of the predicted $B$-meson semileptonic branching fraction.