  We investigate the potential of LHC resonance searches in leptonic final
states to probe the $Z'$ in the minimal $U(1)_{B-L}$ model. Considering the
current constraints on the $Z'$ in terms of its mass $m_{Z'}$ and the
associated gauge coupling $g_{B-L}$ as well as constraints in the Higgs sector,
we analyse the potential of dilepton and four lepton final states for $Z'$
production. This includes Drell-Yan production, Higgs mediated decays and final
state radiation processes concentrating only on the ATLAS and CMS detectors at
the LHC. We show that the four-lepton final state is sensitive to $m_{Z'}$ as
low as 0.25 GeV. Furthermore, setting the Higgs mixing to $\sin\alpha = 0.3$,
this final state has a strong sensitivity and it probes regions of parameter
space where the $Z'$ is long-lived. We demonstrate the sensitivity at the High
Luminosity LHC and comment on the potential of probing displaced vertices due
to long-lived $Z'$. Finally, we also comment on the strength of $Z'$ and Higgs
mediated heavy neutrino processes by taking into account the constraints
derived.
