Abstract
The electron (anti-)neutrino component of the T2K neutrino beam constitutes the largest background in the measurement of electron (anti-)neutrino appearance at the far detector. The electron neutrino scattering is measured directly with the T2K off-axis near detector, ND280. The selection of the electron (anti-)neutrino events in the plastic scintillator target from both neutrino and anti-neutrino mode beams is discussed in this paper. The flux integrated single differential charged-current inclusive electron (anti-)neutrino cross-sections, dσ/dp and dσ/d cos(θ), and the total cross-sections in a limited phase-space in momentum and scattering angle (p > 300 MeV/c and θ ≤ 45°) are measured using a binned maximum likelihood fit and compared to the neutrino Monte Carlo generator predictions, resulting in good agreement.
Highlights
Following the developments in the T2K muon neutrino cross-sections measurements [7,8,9], the differential cross-sections are measured in a model independent way as a function of electron and positron kinematics, the quantities which are measured in the near detector
The neutrino fluxes at the off-axis near detector ND280 in forward horn current (FHC) and reverse horn current (RHC) are shown in figure 1
The RMIP/electromagnetic showers (EM) for high purity control samples (90% or better) is shown in figure 4, where the muon sample comprises cosmic muons and muons produced by neutrino interactions outside ND280 that cross the Entries (a.u.) Entries (a.u.)
Summary
The T2K neutrino beam is produced at the Japan Proton Accelerator Research Complex (JPARC) by colliding 30 GeV protons with a graphite target. The neutrino fluxes at the off-axis near detector ND280 in FHC and RHC are shown in figure 1. The off-axis position of the near detector, from the neutrino beam direction, results in a narrow-band νμ or νμ beam, the same does not occur with νe and νe fluxes due to their production via three-body decays, resulting in broader νe and νe spectra. The mean of the νe energy spectrum at ND280 is 1.28 GeV in FHC and 1.98 GeV in RHC. The mean of the νe energy spectrum in RHC is 0.99 GeV. The total integrated νe flux at ND280 in FHC is ΦFνeHC = (2.67 ± 0.24) × 1011 neutrinos/cm and in RHC is ΦRνeHC = (2.65 ± 0.21) × 1010 neutrinos/cm. The total integrated νe flux at ND280 in RHC is ΦRνeHC = (1.00 ± 0.10) × 1011 anti-neutrinos/cm
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