"Figure 2b" of "Search for low-mass vector and scalar resonances decaying into a quark-antiquark pair in proton-proton collisions at $\sqrt{s}$ = 13 TeV"

Upper limits at 95% CL on the coupling parameters $g_{q\phi}$ (left vertical axis) and $g_{qA}$ (right vertical axis) of the spin-0 model. The $\phi$ and $A$ bosons couple to quarks with a coupling given by $g_{q\phi}$ or $g_{qA}$ times the SM Yukawa couplings, respectively, and decay dominantly to bottom quark-antiquark pairs. The solid line represents the observed limits. The dashed line and the inner (yellow) and outer (blue) bands represent the median and the regions containing 68% and 95%, respectively, of the distribution of expected limits under the background-only hypothesis.