Table 2.

Systematic uncertainties in both the searches for $\mathrm{Z}\to \mathrm{J}/\psi \gamma$ and $\mathrm{H}\to \mathrm{J}/\psi \gamma$. In the $\mathrm{Z}\to \mathrm{J}/\psi \gamma$ search, the uncertainties are averaged over all categories. The numbers for uncertainties in the integrated luminosity, theoretical uncertainties, detector simulation and reconstruction correspond to the changes in the expected number of signal and resonant background events. The numbers for the uncertainties in the signal model correspond to the effect on the mean and width of the Gaussian component of the signal models resulting from the object momentum resolutions

Source	$\mathrm{Z}\to \mathrm{J}/\psi \gamma$ channel		$\mathrm{H}\to \mathrm{J}/\psi \gamma$ channel
	Signal	Resonant	Signal	Resonant
		background		background
Integrated luminosity	2.5%
Theoretical uncertainties
Signal cross section (scale)	3.5%	5.0%	+4.6% − 6.7%
Signal cross section (PDF)	1.7%	5.0%	3.2%
Branching fraction	–	5.0%	–	6.0%
Detector simulation, reconstruction
Pileup weight	0.8%	1.8%	0.7%	1.6%
Trigger	4.0%	4.0%	3.9%	4.0%
Muon ident./Isolation	3.0%	3.4%	2.0%	2.5%
Photon identification	1.1%	1.1%	1.2%	1.2%
Electron veto	1.1%	1.1%	1.0%	1.0%
Signal model
$m_{\mu \mu \gamma }$ scale	0.06%	–	0.1%	–
$m_{\mu \mu \gamma }$ resolution	1.0%	–	4.8%	–