Measurement of the tau neutrino cross section in atmospheric neutrino oscillations with Super-Kamiokande

13 September 2018

Abstract: Using 5326 days of atmospheric neutrino data, a search for atmospheric tau neutrino appearance has been performed in the Super-Kamiokande experiment. Super-Kamiokande measures the tau normalization to be $1.47±0.32$ under the assumption of normal neutrino hierarchy, relative to the expectation of unity with neutrino oscillation. The result excludes the hypothesis of no-tau appearance with a significance level of $4.6\sigma$. The inclusive charged-current tau neutrino cross section averaged by the tau neutrino flux at Super-Kamiokande is measured to be $\left(0.94±0.20\right)×{10}^{-38}\text{}\text{}{\mathrm{cm}}^{2}$. The measurement is consistent with the Standard Model prediction, agreeing to within $1.5\sigma$.

Published in: Physical Review D 98 (2018)