massive gauge bosons after the $ESB$ i.e., the $W^+$, $W^-$ and $Z^0$, is $G=SU(2)_L \times SU(2)_R$, $H=SU(2)_{L+R}$.

Then the low energy dynamics of the $ESB$ is described by a $SU(2)_L \times U(1)_Y$ gauged non-linear sigma model ($GNLSM$) including an arbitrary large number of terms in the action with different number of derivatives of the $GB$ fields and electroweak gauge bosons. The corresponding couplings (parameters) encode the dynamics of the $ESB$ sector of the $SM$ and must be renormalized to absorb divergences. However, at low enough energies only a small number of terms (and couplings) are needed to eliminate all the divergences. In principle the values of these couplings or parameters could be obtained from the underlying theory or directly by fitting them from future experiments.

In this work we will study the possibilities of the $LHC$ for measuring these parameters and the expected corresponding errors. In particular we will concentrate in events producing $Z^0Z^0$ or $W^{\pm}Z^0$ pairs. As it was mentioned above, the application of the chiral Lagrangian technique to the production of electroweak gauge bosons is not new and has already been considered at the literature [@si]. However, all the applications worked out until now are based in the 