Fig. 3.

Display of the transverse momentum of the selected charged particles, the two leptons, and the dilepton pair in the transverse plane corresponding to the same event as in Fig. 1. The $p_{\mathrm{T}}$ of the particles is proportional to the length of the arrows and the dashed lines represent the regions that are defined relative to the ${\overrightarrow{p}}_{\mathrm{T}}(\ell \ell )$ direction. For clarity, the $p_{\mathrm{T}}$ of the leptons has been rescaled by a factor of 0.5