Fig. 2.

Distribution of the distance of the displaced vertex to the interaction region in the transverse plane for data and for a hidden valley model with $m_{{\mathit{\pi }}_v}=35\mathrm{GeV}/{\mathrm{c}}^2$ and ${\mathit{\tau }}_{{\mathit{\pi }}_v}=10\mathrm{ps}$ after the full selection. For visibility, the simulated signal is scaled to 0.62 $\text{fb}{}^{-1}$ assuming a Higgs cross-section of 10 nb and branching fractions of 100 % for $\mathcal{B}(H\to {\mathit{\pi }}_v{\mathit{\pi }}_v)$ and $\mathcal{B}({\mathit{\pi }}_v\to b\overline{b})$. The boundaries of the intervals used in the fit are indicated by the dotted lines. The generated $R_{xy}$ distribution is approximately exponential with an average of about 2 mm