  The most recent results on searches in lepton plus jet final states motivated
by different models beyond the standard model are presented, using pp collision
data collected by the ATLAS and CMS detectors during Run I and Run II at the
CERN LHC. Leptoquarks and heavy Majorana neutrinos that arise in the left-right
model are looked for in the final states with two leptons and two jets (ll +
jj; l = e; mu; tau ). Heavy Majorana neutrinos are further investigated by
relying on a composite-fermion scenario, considering two leptons and one
large-radius jet (ll + J; l = e, mu), and in the context of a model with Type-1
seesaw mechanism, requiring two same-sign leptons plus dijet (ll' + jj; l,l' =
e, mu). Finally, models of microscopic black holes with two to six extra
dimensions are tested by analysing the channels with at least one lepton and
two additional jets (l + jj; l = e, mu). In all the searches, the observed data
are in good agreement with the standard model prediction and 95% confidence
level upper limits are set on the parameters of difierent models.
