\PQc \PAQc)$]{}if such a boson decay is present and VV+other otherwise. Whereas in the signal regions the BDT discriminator is used for the final signal extraction, in the control regions the shape of the $\textit{CvsB}$ distribution is used in the TT, HF, and CC regions, while that of $\textit{CvsL}$ is used in the LF region.

Figure \[fig:BDTCR2lepLow\] shows the most representative distributions of the $CvsB$ discriminant for the subleading $\textit{CvsL}$ jet for the HF and CC control regions in the 2L ([$\PZ(\PGm\PGm$)]{}) low-[$\pt(\PV)$]{}, 2L ([$\PZ(\Pe\Pe)$]{}) high-[$\pt(\PV)$]{}, 1L ([$\PW(\mu\nu)$]{}), and 0L channels. The post-fit distributions (for fit details, see Section \[sec:results\]) in Fig. \[fig:BDTCR2lepLow\] show good agreement between the data and the simulation in these two most significant control regions. Moreover, the employment of the full distribution of the $\textit{CvsB}$ score provides a good separation between the +$\PQb\PQb$ and +$\PQc\PQc$ processes that makes it possible to constrain these two backgrounds. The corresponding distributions for the other channels are not shown but are similar in their behaviour.

![Post-fit $\textit{CvsB}_{\text{min}}$ distributions in the CC (left panel) and HF (right panel) control regions for the 2L ([$\PZ(\PGm\PGm$)]{}) low-[$\pt(\PV)$]{}, 2L ([$\PZ(\Pe\Pe)$]{}) high-[$\pt(\PV)$]{}, 1L ([$\PW(\mu\nu)$]{}), and 0L channels.[]{data-label="fig:BDTCR2lepLow"}](Figure_002-a.pdf "fig:"){width="37.50000%"} ![Post-fit $\textit{CvsB}_{\text{min}}$ distributions in the CC (left 