Fig. 4.

Collinear mass distributions in the ${\mathit{\tau }}_{\mathrm{lep}}$ channel: background estimate compared to the events observed in the data in the ${\mathrm{SR}}_{\mathrm{noJets}}$ (top) and ${\mathrm{SR}}_{\mathrm{withJets}}$ (bottom). Left $e\mathit{\mu }$ channel. Right $\mathit{\mu }e$ channel. In these plots, events from the three $f\left(p_{\mathrm{T}}^{\ell {}_2}\right)$ bins are combined, although the fit parameters are different in each $f\left(p_{\mathrm{T}}^{\ell {}_2}\right)$ bin. The signal expected for a $\text{Br}(H\to \mathit{\mu }\mathit{\tau })=1\%$ is shown in the $\mathit{\mu }e$ channel