For the beta=-sqrt(3) 331 model, electroweak precision data allow v3 between roughly 1.5 and 2.3 TeV and can reproduce the CDF W mass shift for v3 in 1.8-2.3 TeV, provided collider bounds on new gauge bosons are model-dependently relaxed.
Constraints from Precision Electroweak Data on Leptoquarks and Bileptons
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Explicit expressions are derived for the oblique parameters $S$ and $T$ in certain extensions of the standard model. In particular, we consider leptoquarks and bileptons, and find phenomenological constraints on their allowed masses. Leptoquarks suggested by the neutral and charged current anomalies at HERA can give improved agreement with both $S$ and $T$. If bileptons are the only new states, the singly-charged one must be heavier than the directly-established lower limit. Finally, we study SU(15) grand unification and show that there are regions of parameter space where the theory is compatible with experimental data.
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Radiative corrections to the $\rm S, T, U$ parameters and their impact on the $W$ boson mass in the 331 model
For the beta=-sqrt(3) 331 model, electroweak precision data allow v3 between roughly 1.5 and 2.3 TeV and can reproduce the CDF W mass shift for v3 in 1.8-2.3 TeV, provided collider bounds on new gauge bosons are model-dependently relaxed.