Table 4.

Numbers of events observed in the SR after the successive application of the selection requirements, as well as the size of the expected SM background

Requirement	Number of events
Two photons, $p_{\mathrm{T}}^{\mathit{\gamma }}>75$	4982
$\mathrm{\Delta }{\mathit{\varphi }}_{\min }(\mathrm{jet},{\mathit{p}}_{\mathrm{T}}^{\mathrm{miss}})>0.5$	4724
$m_{\mathrm{eff}}>1500$ GeV	1
$E_{\text{T}}^{\text{miss}}>175$ GeV	0
Expected SM background	$0.{27}_{-0.10}^{+0.22}$