Study of Tau Neutrino Production in NA65 Experiment at CERN SPS

In the DsTau (NA65) experiment at CERN SPS, an independent and direct way to study a tau neutrino production in high energy proton-nucleous interactions was proposed. The experimental method is based on a use of high resolution emulsion detectors for effective registration of events with short lived particle decays. The motivation of the project, details of the experimental technique, and the first results of the analysis of the data collected during test runs are presented.