Table 8.

Results in the off-Z search region SR-2j-bveto, in the below-Z range ($20<m_{\ell \ell }<80$ $\mathrm{GeV}$, top) and above-Z range ($m_{\ell \ell }>110$ $\mathrm{GeV}$, bottom). The flavour symmetric, $Z/{\mathit{\gamma }}^{\ast }+\text{jets}$ and fake lepton background components are all derived using data-driven estimates described in the text. All other backgrounds are taken from MC simulation. The first uncertainty is statistical and the second is systematic

	SR-2j-bveto ee	SR-2j-bveto $\mathit{\mu }\mathit{\mu }$	SR-2j-bveto same-flavour combined
Below-Z ($20<m_{\ell \ell }<80$ $\mathrm{GeV}$)
Observed events	30	24	54
Expected background events	$26\pm 4\pm 3$	$24\pm 4\pm 3$	$50\pm 8\pm 5$
Flavour-symmetric backgrounds	$24\pm 4\pm 3$	$22\pm 4\pm 3$	$46\pm 8\pm 4$
$Z/{\mathit{\gamma }}^{\ast }+\text{jets}$	$0.6\pm 0.3\pm 0.7$	$1.6\pm 0.6\pm 1.4$	$2.2\pm 0.7\pm 1.7$
Rare top	$<$0.1	$<$0.1	$<$0.1
WZ / ZZ diboson	$0.6\pm 0.2\pm 0.1$	$0.6\pm 0.2\pm 0.2$	$1.2\pm 0.3\pm 0.2$
Fake leptons	$0.6\pm 0.9\pm 0.1$	$<$0.1	$0.2\pm 0.9\pm 0.1$
Above-Z ($m_{\ell \ell }>110$ $\mathrm{GeV}$)
Observed events	26	29	55
Expected background events	$35\pm 5\pm 4$	$38\pm 4\pm 8$	$73\pm 9\pm 9$
Flavour-symmetric backgrounds	$33\pm 4\pm 4$	$30\pm 4\pm 3$	$63\pm 8\pm 5$
$Z/{\mathit{\gamma }}^{\ast }+\text{jets}$	$0.3\pm 0.2\pm 0.3$	$5.6\pm 0.6\pm 7.5$	$5.9\pm 0.7\pm 7.5$
Rare top	$<$0.1	$<$0.1	$<$0.1
WZ / ZZ diboson	$0.3\pm 0.1\pm 0.1$	$0.6\pm 0.2\pm 0.1$	$0.8\pm 0.2\pm 0.1$
Fake leptons	$1.7\pm 1.1\pm 0.2$	$1.3\pm 1.1\pm 0.5$	$3.0\pm 1.5\pm 0.4$