flavours. Tagging jets is more difficult than tagging jets because they are less distinct from light-flavour quark or gluon jets () in regard to mass, decay length of charmed hadrons produced in the hadronisation process, and multiplicity of tracks inside the jet. The resolved- and merged-jet topology analyses use different strategies for tagging jets. More details on tagging are presented below in Sections \[sec:resolvedanalysis\] and \[sec:boostedanalysis\].

The missing transverse momentum vector is computed as the negative vector  sum of all the PF candidates in an event, and its magnitude is denoted  [@Sirunyan:2019kia]. The magnitude and direction of are modified to account for corrections to the energy scale of the reconstructed jets in the event.

Baseline selection {#sec:selection}
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The search uses the leptonic decays of the vector bosons to define three mutually exclusive channels based on the charged-lepton multiplicity in the final state, namely: “0L” channel as referring to the [$\PZ(\PGn\PGn)\PH(\ccbar)$]{}signal process, “1L” channel as referring to the [$\PW(\ell\PGn)\PH(\ccbar)$]{}signal process, and “2L” channel as referring to the [$\PZ(\ell\ell)\PH(\ccbar)$]{}signal process. The 1L and 2L channels are further subdivided based on lepton flavour. Only electrons and muons are considered in this search.

Events in the 0L channel are collected with a  trigger, 