Speaker
Description
The DsTau (NA65) experiment at CERN is designed to measure the inclusive differential cross-section for Ds meson production, followed by its decay into a tau lepton and tau neutrino, in proton–nucleus interactions. The DsTau detector, employing the nuclear emulsion technique, offers sub-micron spatial resolution, allowing for highly precise detection of short-lived particles such as charmed hadrons. We present the first results from the analysis of data acquired during the 2018 pilot run, focusing on the reconstruction accuracy of proton interaction vertices under high track density conditions. The experimental results on charged particle multiplicities and angular distributions are compared with predictions from several Monte Carlo event generators. The multiplicity distribution in proton–tungsten (p–W) interactions has been tested for the KNO-G scaling, showing approximate agreement. Furthermore, we report the first measurement of the proton interaction length in tungsten. The current status of the Ds
decay search is also discussed, along with preliminary estimates of the differential Ds production cross-section.