  We perform a collider search for fatjet signals originating from boosted
heavy neutrinos and heavy leptons with mass around a few hundred GeV to a TeV,
and which originate from the decay of heavy gauge bosons with masses above 4
TeV in a left-right symmetric extension of the Standard Model (SM). The model
includes a universal seesaw mechanism for the generation of all SM fermion
masses. The fatjet signals come naturally in this model due to the presence of
heavy seesaw partners of the SM fermions decaying to SM gauge bosons which
carry large boost. We employ substructure based variables $LSF$ and $LMD$
together with kinematic variables of fatjets to look for fatjet associated with
non-isolated leptons. These variables help in reducing the SM backgrounds while
retaining enough statistics for signal events, which leads to a robust
discovery potential at the HL-LHC.

High Energy Physics - Phenomenology;High Energy Physics - Experiment