Table 1.

Details of the generation of simulated signal and background event samples. For each physics process, the table gives the final states generated, the $H\to ZZ$ final states(s) for which they are used, the generator, the PDF set, and the underlying-event tune. For the background samples, the order in ${\mathit{\alpha }}_{\text{S}}$ used to normalize the event yield is also given; for the signal, the normalization is the parameter of interest in the fit. More details can be found in the text

Physics process	$H\to ZZ$ search final state	Generator	Cross-section normalization	PDF set	Tune
$W/Z$ boson + jets
$Z/{\mathit{\gamma }}^{\ast }\to {\ell }^{+}{\ell }^{-}/\mathit{\nu }\overline{\mathit{\nu }}$	$\ell \ell \ell \ell /\ell \ell \mathit{\nu }\mathit{\nu }$	Alpgen 2.14 [25]	NNLO [47]	CTEQ6L1 [16]	AUET2 [14, 48]
	$\ell \ell q{q}^{\mathrm{a}}/\mathit{\nu }\mathit{\nu }qq$	Sherpa 1.4.1 [24]	NNLO [49, 50]	NLO CT10	Sherpa default
$W\to \ell \mathit{\nu }$	$\ell \ell \mathit{\nu }\mathit{\nu }$	Alpgen 2.14	NNLO [47]	CTEQ6L1	AUET2
	$\mathit{\nu }\mathit{\nu }qq$	Sherpa 1.4.1	NNLO [49, 50]	NLO CT10	Sherpa default
Top quark
$t\overline{t}$	$\ell \ell \ell \ell /\ell \ell qq/\mathit{\nu }\mathit{\nu }qq$	Powheg-Box r2129 [51–53]	NNLO+NNLL	NLO CT10	Perugia2011C [54]
	$\ell \ell \mathit{\nu }\mathit{\nu }$	MC@NLO 4.03 [39]	[55, 56]		AUET2
$s$-channel and $Wt$	$\ell \ell \ell \ell /\ell \ell qq/\mathit{\nu }\mathit{\nu }qq$	Powheg-Box r1556	NNLO+NNLL	NLO CT10	Perugia2011C
	$\ell \ell \mathit{\nu }\mathit{\nu }$	MC@NLO 4.03	[57, 58]		AUET2
$t$-channel	All	AcerMC 3.8 [44]	NNLO+NNLL [59]	CTEQ6L1	AUET2
Dibosons
$q\overline{q}\to ZZ(\ast )$	$\ell \ell qq/\mathit{\nu }\mathit{\nu }qq$	Powheg-Box r1508 [60]	NLO [35, 61]	NLO CT10	AUET2
	$\ell \ell \ell \ell /\ell \ell \mathit{\nu }\mathit{\nu }$	Powheg-Box r1508 [60]	NNLO QCD [31]	NLO CT10	AUET2
			NLO EW [32, 33]
EW $q\overline{q}(\to h)\to$ $ZZ(\ast )+2j$	$\ell \ell \ell \ell$	MadGraph 5 1.3.28 [43]		CTEQ6L1	AUET2
$gg(\to h^{\ast })\to ZZ$	$\ell \ell \ell \ell$	MCFM 6.1 [46]	NNLO [38]	NLO CT10	AU2
	$\ell \ell \mathit{\nu }\mathit{\nu }$	GG2VV 3.1.3 [36, 37]	(for $h\to ZZ$)	NLO CT10	AU2
$q\overline{q}\to WZ$	$\ell \ell \mathit{\nu }\mathit{\nu }/\ell \ell qq/\mathit{\nu }\mathit{\nu }qq$	Powheg-Box r1508	NLO [35, 61]	NLO CT10	AUET2
	$\ell \ell \ell \ell$	Sherpa 1.4.1			Sherpa default
$q\overline{q}\to WW$	All	Powheg-Box r1508	NLO [35, 61]	NLO CT10	AUET2
$m_h=125\mathrm{GeV}$ SM Higgs boson (background)${}^{\mathrm{b}}$
$q\overline{q}\to Zh\to$ ${\ell }^{+}{\ell }^{-}b\overline{b}/\mathit{\nu }\overline{\mathit{\nu }}b\overline{b}$	$\ell \ell qq/\mathit{\nu }\mathit{\nu }qq$	Pythia 8.165	NNLO [62–64]	CTEQ6L	AU2
$gg\to Zh\to$ ${\ell }^{+}{\ell }^{-}b\overline{b}/\mathit{\nu }\overline{\mathit{\nu }}b\overline{b}$	$\ell \ell qq/\mathit{\nu }\mathit{\nu }qq$	Powheg-Box r1508	NLO [65]	CT10	AU2
Signal
$gg\to H\to ZZ(\ast )$	All	Powheg-Box r1508	–	NLO CT10	AU2
$q\overline{q}\to H+2j$; $H\to ZZ(\ast )$	all	Powheg-Box r1508	–	NLO CT10	AU2
$q\overline{q}\to (W/Z)H$; $H\to ZZ(\ast )$	$\ell \ell \ell \ell$	Pythia 8.163	–	CTEQ6L1	AU2

${}^{\mathrm{a}}$ The $H\to ZZ\to {\ell }^{+}{\ell }^{-}q\overline{q}$ VBF search uses Alpgen instead

${}^{\mathrm{b}}$ For the $H\to ZZ\to {\ell }^{+}{\ell }^{-}{\ell }^{+}{\ell }^{-}$ and $H\to ZZ\to {\ell }^{+}{\ell }^{-}\mathit{\nu }\overline{\mathit{\nu }}$ searches, the SM $h\to ZZ$ boson contribution, along with its interference with the continuum $ZZ$ background, is included in the diboson samples