PoS - Proceedings of Science
Volume 398 - The European Physical Society Conference on High Energy Physics (EPS-HEP2021) - T04: Neutrino Physics
Study of tau neutrino production with nuclear emulsion at CERN-SPS
A.T. Neagu
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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 a large systematical $(\sim50\%)$ and statistical $(\sim30\%)$ errors. The main source of systematical error is due to a poor knowledge of the tau neutrino flux. The effective way for the tau neutrino production is the decay of $D_s$ mesons, produced in proton-nucleus interactions. The DsTau experiment at CERN-SPS has been proposed to measure an inclusive differential cross-section of the $D_s$ production with a consecutive decay to tau lepton in p-A interactions. The goal of experiment is to reduce the systematic uncertainty to $10\%$ level. 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 $D_s\rightarrow \tau \rightarrow\ X$. After successful pilot runs and data analysis, CERN approved the DsTau project as a new experiment NA65 in 2019. During the physics runs, $2.3X10^8$ proton interactions will be collected in the tungsten target, and about 1000 $D_s \rightarrow \tau$ decays will be detected. In this talk, the results from the pilot run will be presented and the prospect for physics runs in 2021-2022 will be given.
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