Table 4.

Observed event counts and predicted numbers of events for each SM background process in the SRs used in the analysis. For two-lepton SRs, background fit results and nominal MC expectations are given for comparison. The “non-prompt” category includes $t\overline{t}$, single top and $Z$+jets processes for the three-lepton SRs SR3A and SR3B. The $p$-value of the observed events for the background only hypothesis ($p_0$) is also shown. The value of $p_0$ is capped at 0.5 if the number of observed events is below the number of expected events

	SR2A	SR2B	SR2C
Data	10	1	2
Fitted total SM	$10.8\pm 1.7$	$2.4\pm 0.9$	$3.5\pm 0.5$
$p_0$	0.50	0.50	0.50
Fitted $t\overline{t}$	$7.3\pm 1.4$	$1.4\pm 0.7$	$2.4\pm 0.4$
Fitted single top	$0.61\pm 0.15$	$0.23\pm 0.17$	$0.{10}_{-0.10}^{+0.13}$
Fitted $Z$+jets	$0.91\pm 0.22$	$0.14\pm 0.06$	$0.16\pm 0.06$
Fitted diboson	$0.46\pm 0.34$	$0.27\pm 0.21$	$0.15\pm 0.12$
Fitted $t\overline{t}V$, $tZ$	$1.0\pm 0.4$	$0.38\pm 0.18$	$0.65\pm 0.23$
Fitted non-prompt	$0.52\pm 0.11$	$<$0.05	$<$0.01
MC exp. total SM	$11.6$	3.0	4.8
MC exp. $t\overline{t}$	8.1	2.0	3.7
MC exp. single top	0.61	0.24	0.14
Data-driven $Z$+jets	0.88	0.13	0.18
MC exp. diboson	0.48	0.28	0.15
MC exp. $t\overline{t}V$, $tZ$	1.0	0.38	0.66
Data-driven non-prompt	0.52	$<$0.05	$<$0.01

	SR3A	SR3B
Data	4	2
Total SM	4.5 $\pm$ 1.4	1.3 $\pm$ 0.4
$p_0$	0.50	0.30
MC exp. $t\overline{t}V$, $tZ$	3.5 $\pm$ 1.2	1.1 $\pm$ 0.4
MC exp. diboson, triboson	0.1 $\pm$ 0.1	0.1 $\pm$ 0.1
MC exp. $Wh$, $Zh$, $t\overline{t}h$	0.1 $\pm$ 0.1	0.04 $\pm$ 0.04
Data-driven non-prompt	0.8 $\pm$ 0.7	$<$0.2