Abstract

The DONUT experiment succeeded in observing tau‐neutrino CC interactions for the first time in 2000. The analysis using total sample is presented in this paper, based on 3.5×1017 protons on target. The number of identified ντ CC interactions is 9 from 581 neutrino interactions located in the emulsion. The result of the first measurement of ντ CC cross section is consistent with the expectation from the Standard Model.

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