Table 1.

Summary of MC sample information for signal and background processes used in this search. The columns from left to right give the process of interest, generator, matrix-element order, parton shower program, and PDF utilized

Process	Generator	Order	Parton Shower / Hadronization	PDF
$q\overline{q}\to Z/{\mathit{\gamma }}^{\ast }\to {\ell }^{+}{\ell }^{-}$	Powheg [26]	NLO	Pythia 8.165 [28]	CT10 [27]
$\mathit{\gamma }\mathit{\gamma }/\mathit{\gamma }q/\mathit{\gamma }\overline{q}\to {\ell }^{+}{\ell }^{-}$	Pythia 8.165 [28]	LO	Pythia 8.165 [28]	MRST2004QED [32]
$t\overline{t}\to \ell X$, $Wt\to X$	MC@NLO 4.06 [33]	NLO	Jimmy 4.31 [34] $+$ Herwig 6.520 [35]	CT10 [27]
$WW,WZ,ZZ\to \ell X/\ell \mathit{\nu }/\ell \ell$	Herwig 6.520 [35]	LO	Herwig 6.520 [35]	CTEQ6L1 [37]
CI: $q\overline{q}\to {\ell }^{+}{\ell }^{-}$	Pythia 8.165 [28]	LO	Pythia 8.165 [28]	MSTW2008LO [30, 31]
ADD: $q\overline{q}/gg\to G^{\ast }\to {\ell }^{+}{\ell }^{-}$	Sherpa 1.3.1 [7]	LO (multi-leg)	Sherpa 1.3.1 [7]	CTEQ6L1 [37]