Baryon and Lepton Number as Local Gauge Symmetries
  We investigate a simple theory where Baryon number (B) and Lepton number (L)
are local gauge symmetries. In this theory B and L are on the same footing and
the anomalies are cancelled by adding a single new fermionic generation. There
is an interesting realization of the seesaw mechanism for neutrino masses.
Furthermore, there is a natural suppression of flavour violation in the quark
and leptonic sectors since the gauge symmetries and particle content forbid
tree level flavor changing neutral currents involving the quarks or charged
leptons. Also one finds that the stability of a dark matter candidate is an
automatic consequence of the gauge symmetry. Some constraints and signals at
the Large Hadron Collider are briefly discussed.
