Table 10.

Event selection and categorization in the $\text{Z}$ 4$\ell$ category

Subcategories	Selection
Global selection
—	$p_{\text{T}}{}_1>25\text{Ge}\text{V}$, $p_{\text{T}}{}_2>15\text{Ge}\text{V}$, $p_{\text{T}}{}_3>10\text{Ge}\text{V}$, $p_{\text{T}}{}_4>10\text{Ge}\text{V}$
	${\text{Q}}_{4\ell }=0$, $min(m_{\ell \ell })>12\text{Ge}\text{V}$, $|m_{\ell \ell }-m_{\text{Z}}|<15\text{Ge}\text{V}$
	No b-tagged jet with $p_{\text{T}}>20\text{Ge}\text{V}$
Signal region
XSF	Same-flavor X pair, $m_{4\ell }>140\text{Ge}\text{V}$
	$10<m_{\ell \ell }^{\text{X}}<60\text{Ge}\text{V}$, $p_{\text{T}}^{\text{miss}}>35\text{Ge}\text{V}$
XDF	Different-flavor X pair, $10<m_{\ell \ell }^{\text{X}}<70\text{Ge}\text{V}$
	$p_{\text{T}}^{\text{miss}}>20\text{Ge}\text{V}$
Control region
$\text{Z}$	$75<m_{\ell \ell }^{\text{X}}<105\text{Ge}\text{V}$, $p_{\text{T}}^{\text{miss}}<35\text{Ge}\text{V}$