Measurement of inclusive double-differential $\nu_\mu$ charged-current cross section with improved acceptance in the T2K off-axis near detector

TL;DR

This paper presents an improved measurement of the inclusive muon neutrino charged-current cross section on carbon, with enhanced angular acceptance and higher statistics, providing more precise data for neutrino interaction models.

Contribution

The study provides the first double-differential cross section measurements with increased angular acceptance and larger data sample in the T2K experiment.

Findings

Total flux-integrated cross section measured as (6.950 ± 0.662) × 10^{-39} cm^2 per nucleon.

Results are consistent with the simulation predictions.

Enhanced angular acceptance improves the precision of neutrino interaction measurements.

Abstract

We report a measurement of the flux-integrated cross section for inclusive muon neutrino charged-current interactions on carbon. The double differential measurements are given as function of the muon momentum and angle. Relative to our previous publication on this topic, these results have an increased angular acceptance and higher statistics. The data sample presented here corresponds to $5.7 \times 10^{20}$ protons-on-target. The total flux-integrated cross section is measured to be $(6.950 \pm 0.662) \times 10^{-39}$ cm$^2$nucleon$^{-1}$ and is consistent with our simulation.