  In an extension of the standard model where baryon number and lepton number
are local gauge symmetries, we analyze the effect of corrections from exotic
fermions and scalars on the oblique parameters $S,\;T,\;U$. Because a light
neutral Higgs $h_0$ with mass around $124-126{\rm GeV}$ strongly constrains the
corresponding parameter space of this model, we also investigate the gluon
fusion process $gg\rightarrow h_0$ and two photon decay of lightest neutral
Higgs $h_0\rightarrow\gamma\gamma$ at the Large Hadron Collider.
