Study of tau neutrino production with nuclear emulsion at CERN-SPS
March 23, 2022
The data on tau neutrino is very scarce, only a few experiments have detected its interactions. At FNAL, the beam dump experiment DONUT, the tau neutrino interaction cross-section was directly measured with large systematical (∼50%) and statistical (∼30%) errors. The main source of systematical errors is due to a poor knowledge of the tau neutrino flux. The effective way for the tau neutrino production is the decay of Ds mesons, produced in proton-nucleus interactions. The DsTau experiment at CERN-SPS has been proposed to measure an inclusive differential cross-section of the Ds production with a consecutive decay to tau lepton in p-A interactions. The goal for this experiment is to reduce the systematic uncertainty to 10% level. After successful pilot runs and data analysis, CERN approved the DsTau project as a new experiment NA65 in 2019. During the physics runs, 2.3×10^8 proton interactions will be collected in the tungsten target, and about 1000 Ds->tau decays will be detected. In this talk, the results from the pilot run will be presented and the prospect for physics run in 2021-2022 will be given.
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