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تسجيل مستخدم جديدDsTau: Study of tau neutrino production with 400 GeV protons from the CERN-SPS
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In the DsTau experiment at the CERN SPS, an independent and direct way to measure tau neutrino production following high energy proton interactions was proposed. As the main source of tau neutrinos is a decay of Ds mesons, produced in proton-nucleus interactions, the project aims at measuring a differential cross section of this reaction. The experimental method is based on a use of high resolution emulsion detectors for effective registration of events with short lived particle decays. Here we present the motivation of the study, details of the experimental technique, and the first results of the analysis of the data collected during test runs, which prove feasibility of the full scale study of the process in future.
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The DsTau project proposes to study tau-neutrino production in high-energy proton interactions. The outcome of this experiment are prerequisite for measuring the $ u_tau$ charged-current cross section that has never been well measured. Precisely meas
uring the cross section would enable testing of lepton universality in $ u_tau$ scattering and it also has practical implications for neutrino oscillation experiments and high-energy astrophysical $ u_tau$ observations. $D_s$ mesons, the source of tau neutrinos, following high-energy proton interactions will be studied by a novel approach to detect the double-kink topology of the decays $D_s rightarrow tau u_tau$ and $taurightarrow u_tau X$. Directly measuring $D_srightarrow tau$ decays will provide an inclusive measurement of the $D_s$ production rate and decay branching ratio to $tau$. The momentum reconstruction of $D_s$ will be performed by combining topological variables. This project aims to detect 1,000 $D_s rightarrow tau$ decays in $2.3 times 10^8$ proton interactions in tungsten target to study the differential production cross section of $D_s$ mesons. To achieve this, state-of-the-art emulsion detectors with a nanometric-precision readout will be used. The data generated by this project will enable the $ u_tau$ cross section from DONUT to be re-evaluated, and this should significantly reduce the total systematic uncertainty. Furthermore, these results will provide essential data for future $ u_tau$ experiments such as the $ u_tau$ program in the SHiP project at CERN. In addition, the analysis of $2.3 times 10^8$ proton interactions, combined with the expected high yield of $10^5$ charmed decays as by-products, will enable the extraction of additional physical quantities.
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