selection $(\textit{CvsL}>0.4,~\textit{CvsB}<0.2)$. In order to differentiate the TT from HF control regions, further requirements are applied such as a veto on the reconstructed boson mass in the 2L channel, $m_{\ell\ell}\notin [75,120]\GeV$, and the requirement ${\ensuremath{\text{N}^{\text{aj}}_{\text{small-}R}}}\geq2$. The CC control region is defined identically to the signal region, except for inverting the requirement on the mass. The simulated +jets backgrounds are similarly split into four classes depending on the flavour(s) of the additional jet(s) present in the processes: +2 light-flavour quark or gluon jets, [+]{}and 1or 1, +$\PQb\PQb$ or $\PQb\PQc$, and +$\PQc\PQc$ jets.

Separate normalisation scale factors are used to constrain +jets processes in the 0L and 2L channels, while the normalisation scale factors related to +jets processes are shared between the 0L and 1L analysis channels. To constrain the +jets process, on the other hand, each channel relies on its own independent normalisation scale factors. The normalisation scale factors are measured together with the signal strength modifier through a simultaneous fit to data in all control and signal regions for all of the analysis channels. The simulated diboson background is split according to the presence or absence of a boson decaying to a pair of charm quarks, labelling them as [$\PV\PZ(\PZ\to 