Performances of the Reconstruction of the Primary Proton Vertices along the Beam Axis in the NA65(DsTau) Experiment

The NA65 (DsTau) experiment studies the tau neutrino production in accelerator beams, following the sequential $${{D}_{s}}$$ decays. For registering short lived particles, produced in high energy proton-nuclear interactions, the experiment uses a set-up based on nuclear tracking emulsion detectors.The present report shows the capabilities of the reconstruction of the primary proton interactions in the detector, in a pile-up of $${{10}^{5}}{\text{--}}{{10}^{6}}$$ particles/cm2.