References - Bogoliubov Laboratory of Theoretical Physics - JINR

y f ν V = f l V = f u V = f d gz
V = − gY sW ,wheregz≡g and gY is the standard model U(1)Y
B−L
charge. We see that Z ′ couples universally with all fermions. For the flipped model these
couplings are more complicated and we shall show them elsewhere [10]. We recall that
the difference among models with additional U(1)’s groups not inspired in unified theories
and those we are considering here is that the neutral current parameters in the latter case
must satisfy some relations [9] that do not exist in the former.
Similar analysis has been done for the Z ′ bosons of the 3-3-1 models [11] and we shall
show elsewhere [10].
This work was fully supported by FAPESP (ECFSF) under the process 07/59398-2
and partially by CNPq under the process 307807/2006-1 (JCM) and 302102/2008-6 (VP).
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