Measurement of ν̅μ and νμ charged current inclusive cross sections and their ratio with the T2K off-axis near detector

Abstract

We report a measurement of cross section σðνμ þ nucleus → μ− þ XÞ and the first measurements of the cross section σð¯νμ þ nucleus → μþ þ XÞ and their ratio Rðσð¯νÞ σðνÞÞ at (anti) neutrino energies below 1.5 GeV. We determine the single momentum bin cross section measurements, averaged over the T2K ¯ν=ν-flux, for the detector target material (mainly carbon, oxygen, hydrogen and copper) with phase space restricted laboratory frame kinematics of θμ < 32° and pμ > 500 MeV=c. The results are σð¯νÞ ¼ ð0.900 0.029ðstatÞ 0.088ðsystÞÞ × 10−39 and σðνÞ ¼ ð2.41 0.022ðstatÞ 0.231ðsystÞÞ × 10−39 in units of cm2=nucleon and Rðσð¯νÞ σðνÞÞ ¼ 0.373 0.012ðstatÞ 0.015ðsystÞ.