Kink invariant mass $M_{\mu\nu}$ in data (red circles) and Monte-Carlo (black line) for summed particles and antiparticles, integrated over the mother transverse momentum range 0.2 < $p_{\rm{T}}$ < 6.0 GeV/$c$ and $|y| < 0.7$ before (top panel) and after (bottom panel) the topological selections, based mainly on the $q_\mathrm{T}$ and the maximum decay opening angle.