First Measurement of the Charged Current $\overline{\nu}_{\mu}$ Double Differential Cross Section on a Water Target without Pions in the final state

TL;DR

This paper presents the first measurement of the differential cross section for charged-current antineutrino interactions on water without pions in the final state, providing valuable data for neutrino interaction models.

Contribution

It provides the first differential measurement of the $ar{ u}_$ water interaction cross section without pions, using the T2K detector data.

Findings

Integrated cross section: (1.11 ± 0.18)×10⁻³⁸ cm² per water molecule.

Comparison with nuclear models shows varying degrees of agreement.

First such measurement on water with no pions in the final state.

Abstract

This paper reports the first differential measurement of the charged-current $\overline{\nu}_{\mu}$ interaction cross section on water with no pions in the final state. The unfolded flux-averaged measurement using the T2K off-axis near detector is given in double differential bins of $\mu^+$ momentum and angle. The integrated cross section in a restricted phase space is $\sigma=\left(1.11\pm0.18\right)\times10^{-38}$ cm$^{2}$ per water molecule. Comparisons with several nuclear models are also presented.