# Measurement of the electron neutrino charged-current interaction rate on water with the T2K ND280 pi-zero detector

Abe, K. and Adam, J. and Aihara, H. and Andreopoulos, C. and Aoki, S. and Ariga, A. and Assylbekov, S. and Autiero, D. and Barbi, M. and Barker, G. J. and Barr, G. and Bartet-Friburg, P. and Bass, M. and Batkiewicz, M. and Bay, F. and Berardi, V. and Berger, B. E. and Berkman, S. and Bhadra, S. and Blaszczyk, F. d. M. and Blondel, A. and Bolognesi, S. and Bordoni, S. and Boyd, S. B. and Brailsford, D. and Bravar, A. and Bronner, C. and Buchanan, N. and Calland, R. G. and Rodríguez, J. Caravaca and Cartwright, S. L. and Castillo, R. and Catanesi, M. G. and Cervera, A. and Cherdack, D. and Chikuma, N. and Christodoulou, G. and Clifton, A. and Dealtry, T. and Finch, A. J. and Grant, N. and Kormos, L. L. and Lamont, I. and Lawe, M. and Nowak, J. and O'Keeffe, H. M. and Ratoff, P. N. and Reeves, M. and Shaw, D. and Southwell, L. (2015) Measurement of the electron neutrino charged-current interaction rate on water with the T2K ND280 pi-zero detector. Physical Review D, 91 (11). ISSN 1550-7998

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1503.08815v4 - Accepted Version

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PhysRevD.91.112010.pdf - Published Version

## Abstract

This paper presents a measurement of the charged current interaction rate of the electron neutrino beam component of the beam above $1.5$~GeV using the large fiducial mass of the T2K $\pi^0$ detector. The predominant poriton of the $\nu_e$ flux ($\sim$85 %) at these energies comes from kaon decays. The measured ratio of the observed beam interaction rate to the predicted rate in the detector with water targets filled is 0.89 $\pm$ 0.08 (stat.) $\pm$ 0.11 (sys.), and with the water targets emptied is 0.90 $\pm$ 0.09 (stat.) $\pm$ 0.13 (sys.). The ratio obtained for the interactions on water only from an event subtraction method is 0.87 $\pm$ 0.33 (stat.) $\pm$ 0.21 (sys.). This is the first measurement of the interaction rate of electron neutrinos on water, which is particularly of interest to experiments with water Cherenkov detectors.

Item Type:
Journal Article
Journal or Publication Title:
Physical Review D