Fig. 8.

Contributions to the predicted primary vertex reconstruction efficiency as a function of the average number of interactions per bunch crossing, $\mathit{\mu }$. The mutually exclusive categories of events are defined in Sect. 5.1. The black circles show the contribution to the efficiency from events categorised as clean, and the blue and red circles show the contributions from events with low and high pile-up contamination respectively. The open crosses show the sum of the contributions from events that are clean and those with low pile-up contamination; the filled crosses show the sum of the contributions from all categories and represent the overall efficiency. The hard-scatter processes considered are Higgs-boson decay into $\mathit{\gamma }\mathit{\gamma }$, $t\overline{t}$ production with a lepton in the decay, and Z-boson decay into $\mathit{\mu }\mathit{\mu }$