Status of DsTau (NA65) data analysis

The DsTau experiment at CERN-SPS has been proposed to measure an inclusive differential cross-
section of a D_S production with a consecutive decay to tau lepton in p-A interactions. A precise
measurement of the tau neutrino cross section would enable a search for new physics effects such
as testing the Lepton Universality (LU) of Standard Model in neutrino interactions. The detector
is based on nuclear emulsion providing a sub-micron spatial resolution for the detection of short
length and small “kink” decays. Therefore, it is very suitable to search for peculiar decay topologies
(“double kink”) of Ds->τ->X. The physics run in 2021 was successfully done and the emulsion films
are ready for scanning and analysis. In this presentation, the momentum measurement of charged
particles through MCS and the status of data analysis will be presented.