The DsTau (NA65) experiment at CERN aims to measure the inclusive differential cross-section for the production of $D_s$ mesons decaying into a tau lepton and a tau neutrino in proton–nucleus (p-A) interactions. The DsTau detector employs the nuclear emulsion technique, providing exceptional spatial resolution for detecting short-lived particles such as charmed hadrons.
In this report, we present the initial results from the analysis of the pilot-run data, focusing on the accuracy of proton interaction vertex reconstruction. Achieving high precision in vertex reconstruction enables accurate measurements of the reaction length and charged particle multiplicities, even in high-proton-intensity track density environments.
The data we collected have been compared with several Monte Carlo event generators. The findings from this study can help validate event generators.