  Gauge boson masses for a minimal $SU(4)_{EW} \otimes U(1)_{B-l}$
model]{Following the general procedure of spontaneous symmetry breaking of a
$SU(4)_{EW} \otimes U(1)_{B-l}$ electroweak gauge group with left-right
symmetry, we obtain the gauge boson masses and currents for the minimal version
of the model. The physical eigenstates for neutral gauge bosons are determined
by introducing two mixing angles $\theta_4$ and $\theta_3$ which are related to
the electroweak mixing angle $\theta_w$ at the unification scale. By
introducing some physical approaches in order to simplify the calculations, we
calculate the charged and neutral currents. Differently from other previous
propositions, the results are obtained from a theoretical constraint upon the
coupling constants as a consequence of embedding the symmetry into the
Pati-Salam electroweak coupling $SU(4)_{EW} \otimes SU(4)_{PS}$.
