Measurement of the intrinsic electron neutrino component in the T2K neutrino beam with the ND280 detector

Abstract

The T2K experiment has reported the first observation of the appearance of electron neutrinos in a muon neutrino beam. The main and irreducible background to the appearance signal comes from the presence in the neutrino beam of a small intrinsic component of electron neutrinos originating from muon and kaon decays. In T2K, this component is expected to represent 1.2% of the total neutrino flux. A measurement of this component using the near detector (ND280), located 280 m from the target, is presented. The charged current interactions of electron neutrinos are selected by combining the particle identification capabilities of both the time projection chambers and electromagnetic calorimeters of ND280. The measured ratio between the observed electron neutrino beam component and the prediction is 1.01+-0.10 providing a direct confirmation of the neutrino fluxes and neutrino cross section modeling used for T2K neutrino oscillation analyses. Electron neutrinos coming from muons and kaons decay are also separately measured, resulting in a ratio with respect to the prediction of 0.68+-0.30 and 1.10+-0.14, respectively.

arXiv comment19 pages, 19 figures

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• Characterization of resistive Micromegas detectors for the upgrade of the T2K Near Detector Time Projection Chambers
• Search for neutral-current induced single photon production at the ND280 near detector in T2K
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• Measurement of the single ${\pi }^0$ production rate in neutral current neutrino interactions on water
• The Majorana neutrino mass matrix indicated by the current data
• Investigating the differences between electron and muon neutrino interactions using the T2K near detector
• Measuring the electron anti-neutrino beam component in the T2K near detector ND280