Abstract :
As described previously, a new massive gauge boson (X) coupling only to the third family produces a tantalizing pattern of deviations away from the standard model. These include increasing ΓbΓh and decreasing the αs(Mz) extracted from ΓhΓl. We review the status of these X-Z mixing effects. We then calculate X boson induced vertex corrextions to Z partial decay widths and to tt production in pp colliders.
