channel of the merged-jet topology analysis, where [$\text{N}^{\text{aj}}_{\text{small-}R}$]{} represents the additional [small-$R$]{} jet multiplicity. This requirement is not needed in the 2L channel of the resolved-jet topology analysis where the top quark background is negligible.

The dominant background that remains after the application of the event selection described above is +jets. Contribution from this background is suppressed by requiring the dijet invariant mass ($m_{\text{jj}}$) to satisfy $50<m_{\text{jj}}<200\GeV$. Contributions from and single top processes remain significant in the 0L and 1L channels because of the presence of at least one boson and because  quarks are often misidentified as  quarks by the tagging algorithms. Contributions from diboson processes are typically small as a result of their small production cross sections. The background originating from bosons decaying into quarks presents kinematic properties similar to those of the signal, with the exception of a higher average energy of neutrinos in jets than in jets. This background is reduced by exploiting dedicated jet flavour taggers, as described in Sections \[sec:resolvedanalysis\] and \[sec:boostedanalysis\].

The details of the resolved-jet topology and merged-jet topology analyses are described in Sections \[sec:resolved\_an\] and \[sec:boosted\_an\], respectively. Section \[sec:systematics\] is dedicated to the treatment of the systematics uncertainties and Section \[sec:results\] presents 