"Figure A1a" of "Search for low-mass vector and scalar resonances decaying into a quark-antiquark pair in proton-proton collisions at $\sqrt{s}$ = 13 TeV"

Recast of the 95% CL exclusion limits into the kinetic mixing parameter, $\epsilon^2$, of a dark-photon model ($A'$). The solid (dashed) red lines represent the observed (expected) upper limits from this analysis. The orange and blue lines represent the minimum allowed coupling compatible with the observed DM relic density for representative values of $m_{DM}/m_{M}$. The hatched lines show the direction of the excluded regions.