  In this paper we study the $Z$, $Z+$ jet, $Z+c$ and $Z+c+$ jet production in
$pp$ collisions at the LHC considering different models for an intrinsic charm
content of the proton. We analyse the impact of the intrinsic charm in the
rapidity and transverse momentum distributions for these different processes.
Our results indicated that differently from the other processes, the $Z+c$
cross section is strongly affected by the presence of the intrinsic charm.
Moreover, we propose the analysis of the ratios $R(Z+c/Z) \equiv
\sigma(Z+c)/\sigma(Z)$ and $R(Z+c/Z+\mbox{jet}) \equiv
\sigma(Z+c)/\sigma(Z+\mbox{jet})$ and demonstrate that these observables can be
used as a probe of the intrinsic charm.
