Kinematic reconstruction of atmospheric neutrino events in a large water Cherenkov detector with proton identification

M. Fechner; K. Abe; Y. Hayato; T. Iida; M. Ikeda; J. Kameda; K. Kobayashi; Y. Koshio; M. Miura; S. Moriyama; M. Nakahata; S. Nakayama; Y. Obayashi; H. Ogawa; H. Sekiya; M. Shiozawa; Y. Suzuki; A. Takeda; Y. Takenaga; Y. Takeuchi; K. Ueno; K. Ueshima; H. Watanabe; S. Yamada; S. Hazama; I. Higuchi; C. Ishihara; T. Kajita; K. Kaneyuki; G. Mitsuka; H. Nishino; K. Okumura; N. Tanimoto; M. R. Vagins; F. Dufour; E. Kearns; M. Litos; J. L. Raaf; J. L. Stone; L. R. Sulak; W. Wang; M. Goldhaber; S. Dazeley; R. Svoboda; K. Bayes; D. Casper; J. P. Cravens; W. R. Kropp; S. Mine; C. Regis; M. B. Smy; H. W. Sobel; K. S. Ganezer; J. Hill; W. E. Keig; J. S. Jang; J. Y. Kim; I. T. Lim; K. Scholberg; C. W. Walter; R. Wendell; S. Tasaka; J. G. Learned; S. Matsuno; Y. Watanabe; T. Hasegawa; T. Ishida; T. Ishii; T. Kobayashi; T. Nakadaira; K. Nakamura; K. Nishikawa; Y. Oyama; K. Sakashita; T. Sekiguchi; T. Tsukamoto; A. T. Suzuki; A. Minamino; T. Nakaya; M. Yokoyama; Y. Fukuda; Y. Itow; T. Tanaka; C. K. Jung; G. Lopez; C. McGrew; R. Terri; C. Yanagisawa; N. Tamura; Y. Idehara; M. Sakuda; Y. Kuno; M. Yoshida; S. B. Kim; B. S. Yang; T. Ishizuka; H. Okazawa; Y. Choi; H. K. Seo; Y. Furuse; K. Nishijima; Y. Yokosawa; M. Koshiba; Y. Totsuka; S. Chen; Y. Heng; Z. Yang; H. Zhang; D. Kielczewska; E. Thrane; R. J. Wilkes

doi:10.1103/PhysRevD.79.112010

Kinematic reconstruction of atmospheric neutrino events in a large water Cherenkov detector with proton identification

M. Fechner^*, K. Abe, Y. Hayato, T. Iida, M. Ikeda, J. Kameda, K. Kobayashi, Y. Koshio, M. Miura, S. Moriyama, M. Nakahata, S. Nakayama, Y. Obayashi, H. Ogawa, H. Sekiya, M. Shiozawa, Y. Suzuki, A. Takeda, Y. Takenaga, Y. TakeuchiK. Ueno, K. Ueshima, H. Watanabe, S. Yamada, S. Hazama, I. Higuchi, C. Ishihara, T. Kajita, K. Kaneyuki, G. Mitsuka, H. Nishino, K. Okumura, N. Tanimoto, M. R. Vagins, F. Dufour, E. Kearns, M. Litos, J. L. Raaf, J. L. Stone, L. R. Sulak, W. Wang, M. Goldhaber, S. Dazeley, R. Svoboda, K. Bayes, D. Casper, J. P. Cravens, W. R. Kropp, S. Mine, C. Regis, M. B. Smy, H. W. Sobel, K. S. Ganezer, J. Hill, W. E. Keig, J. S. Jang, J. Y. Kim, I. T. Lim, K. Scholberg, C. W. Walter, R. Wendell, S. Tasaka, J. G. Learned, S. Matsuno, Y. Watanabe, T. Hasegawa, T. Ishida, T. Ishii, T. Kobayashi, T. Nakadaira, K. Nakamura, K. Nishikawa, Y. Oyama, K. Sakashita, T. Sekiguchi, T. Tsukamoto, A. T. Suzuki, A. Minamino, T. Nakaya, M. Yokoyama, Y. Fukuda, Y. Itow, T. Tanaka, C. K. Jung, G. Lopez, C. McGrew, R. Terri, C. Yanagisawa, N. Tamura, Y. Idehara, M. Sakuda, Y. Kuno, M. Yoshida, S. B. Kim, B. S. Yang, T. Ishizuka, H. Okazawa, Y. Choi, H. K. Seo, Y. Furuse, K. Nishijima, Y. Yokosawa, M. Koshiba, Y. Totsuka, S. Chen, Y. Heng, Z. Yang, H. Zhang, D. Kielczewska, E. Thrane, R. J. Wilkes

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

27 Citations (Scopus)

Abstract

We report the development of a proton identification method for the Super-Kamiokande (SK) detector. This new tool is applied to the search for events with a single proton track, a high purity neutral current sample of interest for sterile neutrino searches. After selection using a neural network, we observe 38 events in the combined SK-I and SK-II data corresponding to 2285.1 days of exposure, with an estimated signal-to-background ratio of 1.6 to 1. Proton identification was also applied to a direct search for charged-current quasielastic (CCQE) events, obtaining a high precision sample of fully kinematically reconstructed atmospheric neutrinos, which has not been previously reported in water Cherenkov detectors. The CCQE fraction of this sample is 55%, and its neutrino (as opposed to antineutrino) fraction is 91.7±3%. We selected 78μ-like and 47 e-like events in the SK-I and SK-II data set. With this data, a clear zenith angle distortion of the neutrino direction itself is reported in a sub-GeV sample of μ neutrinos where the lepton angular correlation to the incoming neutrino is weak. Our fit to νμ→ντ oscillations using the neutrino LE distribution of the CCQE sample alone yields a wide acceptance region compatible with our previous results and excludes the no-oscillation hypothesis at 3-sigma.

Original language	English
Article number	112010
Journal	Physical Review D - Particles, Fields, Gravitation and Cosmology
Volume	79
Issue number	11
DOIs	https://doi.org/10.1103/PhysRevD.79.112010
Publication status	Published - 2009 Jun 22
Externally published	Yes

ASJC Scopus subject areas

Nuclear and High Energy Physics
Physics and Astronomy (miscellaneous)

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10.1103/PhysRevD.79.112010

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Fechner, M., Abe, K., Hayato, Y., Iida, T., Ikeda, M., Kameda, J., Kobayashi, K., Koshio, Y., Miura, M., Moriyama, S., Nakahata, M., Nakayama, S., Obayashi, Y., Ogawa, H., Sekiya, H., Shiozawa, M., Suzuki, Y., Takeda, A., Takenaga, Y., ... Wilkes, R. J. (2009). Kinematic reconstruction of atmospheric neutrino events in a large water Cherenkov detector with proton identification. Physical Review D - Particles, Fields, Gravitation and Cosmology, 79(11), [112010]. https://doi.org/10.1103/PhysRevD.79.112010

Fechner, M, Abe, K, Hayato, Y, Iida, T, Ikeda, M, Kameda, J, Kobayashi, K, Koshio, Y, Miura, M, Moriyama, S, Nakahata, M, Nakayama, S, Obayashi, Y, Ogawa, H, Sekiya, H, Shiozawa, M, Suzuki, Y, Takeda, A, Takenaga, Y, Takeuchi, Y, Ueno, K, Ueshima, K, Watanabe, H, Yamada, S, Hazama, S, Higuchi, I, Ishihara, C, Kajita, T, Kaneyuki, K, Mitsuka, G, Nishino, H, Okumura, K, Tanimoto, N, Vagins, MR, Dufour, F, Kearns, E, Litos, M, Raaf, JL, Stone, JL, Sulak, LR, Wang, W, Goldhaber, M, Dazeley, S, Svoboda, R, Bayes, K, Casper, D, Cravens, JP, Kropp, WR, Mine, S, Regis, C, Smy, MB, Sobel, HW, Ganezer, KS, Hill, J, Keig, WE, Jang, JS, Kim, JY, Lim, IT, Scholberg, K, Walter, CW, Wendell, R, Tasaka, S, Learned, JG, Matsuno, S, Watanabe, Y, Hasegawa, T, Ishida, T, Ishii, T, Kobayashi, T, Nakadaira, T, Nakamura, K, Nishikawa, K, Oyama, Y, Sakashita, K, Sekiguchi, T, Tsukamoto, T, Suzuki, AT, Minamino, A, Nakaya, T, Yokoyama, M, Fukuda, Y, Itow, Y, Tanaka, T, Jung, CK, Lopez, G, McGrew, C, Terri, R, Yanagisawa, C, Tamura, N, Idehara, Y, Sakuda, M, Kuno, Y, Yoshida, M, Kim, SB, Yang, BS, Ishizuka, T, Okazawa, H, Choi, Y, Seo, HK, Furuse, Y, Nishijima, K, Yokosawa, Y, Koshiba, M, Totsuka, Y, Chen, S, Heng, Y, Yang, Z, Zhang, H, Kielczewska, D, Thrane, E & Wilkes, RJ 2009, 'Kinematic reconstruction of atmospheric neutrino events in a large water Cherenkov detector with proton identification', Physical Review D - Particles, Fields, Gravitation and Cosmology, vol. 79, no. 11, 112010. https://doi.org/10.1103/PhysRevD.79.112010

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title = "Kinematic reconstruction of atmospheric neutrino events in a large water Cherenkov detector with proton identification",

abstract = "We report the development of a proton identification method for the Super-Kamiokande (SK) detector. This new tool is applied to the search for events with a single proton track, a high purity neutral current sample of interest for sterile neutrino searches. After selection using a neural network, we observe 38 events in the combined SK-I and SK-II data corresponding to 2285.1 days of exposure, with an estimated signal-to-background ratio of 1.6 to 1. Proton identification was also applied to a direct search for charged-current quasielastic (CCQE) events, obtaining a high precision sample of fully kinematically reconstructed atmospheric neutrinos, which has not been previously reported in water Cherenkov detectors. The CCQE fraction of this sample is 55%, and its neutrino (as opposed to antineutrino) fraction is 91.7±3%. We selected 78μ-like and 47 e-like events in the SK-I and SK-II data set. With this data, a clear zenith angle distortion of the neutrino direction itself is reported in a sub-GeV sample of μ neutrinos where the lepton angular correlation to the incoming neutrino is weak. Our fit to νμ→ντ oscillations using the neutrino LE distribution of the CCQE sample alone yields a wide acceptance region compatible with our previous results and excludes the no-oscillation hypothesis at 3-sigma.",

author = "M. Fechner and K. Abe and Y. Hayato and T. Iida and M. Ikeda and J. Kameda and K. Kobayashi and Y. Koshio and M. Miura and S. Moriyama and M. Nakahata and S. Nakayama and Y. Obayashi and H. Ogawa and H. Sekiya and M. Shiozawa and Y. Suzuki and A. Takeda and Y. Takenaga and Y. Takeuchi and K. Ueno and K. Ueshima and H. Watanabe and S. Yamada and S. Hazama and I. Higuchi and C. Ishihara and T. Kajita and K. Kaneyuki and G. Mitsuka and H. Nishino and K. Okumura and N. Tanimoto and Vagins, {M. R.} and F. Dufour and E. Kearns and M. Litos and Raaf, {J. L.} and Stone, {J. L.} and Sulak, {L. R.} and W. Wang and M. Goldhaber and S. Dazeley and R. Svoboda and K. Bayes and D. Casper and Cravens, {J. P.} and Kropp, {W. R.} and S. Mine and C. Regis and Smy, {M. B.} and Sobel, {H. W.} and Ganezer, {K. S.} and J. Hill and Keig, {W. E.} and Jang, {J. S.} and Kim, {J. Y.} and Lim, {I. T.} and K. Scholberg and Walter, {C. W.} and R. Wendell and S. Tasaka and Learned, {J. G.} and S. Matsuno and Y. Watanabe and T. Hasegawa and T. Ishida and T. Ishii and T. Kobayashi and T. Nakadaira and K. Nakamura and K. Nishikawa and Y. Oyama and K. Sakashita and T. Sekiguchi and T. Tsukamoto and Suzuki, {A. T.} and A. Minamino and T. Nakaya and M. Yokoyama and Y. Fukuda and Y. Itow and T. Tanaka and Jung, {C. K.} and G. Lopez and C. McGrew and R. Terri and C. Yanagisawa and N. Tamura and Y. Idehara and M. Sakuda and Y. Kuno and M. Yoshida and Kim, {S. B.} and Yang, {B. S.} and T. Ishizuka and H. Okazawa and Y. Choi and Seo, {H. K.} and Y. Furuse and K. Nishijima and Y. Yokosawa and M. Koshiba and Y. Totsuka and S. Chen and Y. Heng and Z. Yang and H. Zhang and D. Kielczewska and E. Thrane and Wilkes, {R. J.}",

year = "2009",

month = jun,

day = "22",

doi = "10.1103/PhysRevD.79.112010",

language = "English",

volume = "79",

journal = "Physical Review D - Particles, Fields, Gravitation and Cosmology",

issn = "1550-7998",

number = "11",

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TY - JOUR

T1 - Kinematic reconstruction of atmospheric neutrino events in a large water Cherenkov detector with proton identification

AU - Fechner, M.

AU - Abe, K.

AU - Hayato, Y.

AU - Iida, T.

AU - Ikeda, M.

AU - Kameda, J.

AU - Kobayashi, K.

AU - Koshio, Y.

AU - Miura, M.

AU - Moriyama, S.

AU - Nakahata, M.

AU - Nakayama, S.

AU - Obayashi, Y.

AU - Ogawa, H.

AU - Sekiya, H.

AU - Shiozawa, M.

AU - Suzuki, Y.

AU - Takeda, A.

AU - Takenaga, Y.

AU - Takeuchi, Y.

AU - Ueno, K.

AU - Ueshima, K.

AU - Watanabe, H.

AU - Yamada, S.

AU - Hazama, S.

AU - Higuchi, I.

AU - Ishihara, C.

AU - Kajita, T.

AU - Kaneyuki, K.

AU - Mitsuka, G.

AU - Nishino, H.

AU - Okumura, K.

AU - Tanimoto, N.

AU - Vagins, M. R.

AU - Dufour, F.

AU - Kearns, E.

AU - Litos, M.

AU - Raaf, J. L.

AU - Stone, J. L.

AU - Sulak, L. R.

AU - Wang, W.

AU - Goldhaber, M.

AU - Dazeley, S.

AU - Svoboda, R.

AU - Bayes, K.

AU - Casper, D.

AU - Cravens, J. P.

AU - Kropp, W. R.

AU - Mine, S.

AU - Regis, C.

AU - Smy, M. B.

AU - Sobel, H. W.

AU - Ganezer, K. S.

AU - Hill, J.

AU - Keig, W. E.

AU - Jang, J. S.

AU - Kim, J. Y.

AU - Lim, I. T.

AU - Scholberg, K.

AU - Walter, C. W.

AU - Wendell, R.

AU - Tasaka, S.

AU - Learned, J. G.

AU - Matsuno, S.

AU - Watanabe, Y.

AU - Hasegawa, T.

AU - Ishida, T.

AU - Ishii, T.

AU - Kobayashi, T.

AU - Nakadaira, T.

AU - Nakamura, K.

AU - Nishikawa, K.

AU - Oyama, Y.

AU - Sakashita, K.

AU - Sekiguchi, T.

AU - Tsukamoto, T.

AU - Suzuki, A. T.

AU - Minamino, A.

AU - Nakaya, T.

AU - Yokoyama, M.

AU - Fukuda, Y.

AU - Itow, Y.

AU - Tanaka, T.

AU - Jung, C. K.

AU - Lopez, G.

AU - McGrew, C.

AU - Terri, R.

AU - Yanagisawa, C.

AU - Tamura, N.

AU - Idehara, Y.

AU - Sakuda, M.

AU - Kuno, Y.

AU - Yoshida, M.

AU - Kim, S. B.

AU - Yang, B. S.

AU - Ishizuka, T.

AU - Okazawa, H.

AU - Choi, Y.

AU - Seo, H. K.

AU - Furuse, Y.

AU - Nishijima, K.

AU - Yokosawa, Y.

AU - Koshiba, M.

AU - Totsuka, Y.

AU - Chen, S.

AU - Heng, Y.

AU - Yang, Z.

AU - Zhang, H.

AU - Kielczewska, D.

AU - Thrane, E.

AU - Wilkes, R. J.

PY - 2009/6/22

Y1 - 2009/6/22

N2 - We report the development of a proton identification method for the Super-Kamiokande (SK) detector. This new tool is applied to the search for events with a single proton track, a high purity neutral current sample of interest for sterile neutrino searches. After selection using a neural network, we observe 38 events in the combined SK-I and SK-II data corresponding to 2285.1 days of exposure, with an estimated signal-to-background ratio of 1.6 to 1. Proton identification was also applied to a direct search for charged-current quasielastic (CCQE) events, obtaining a high precision sample of fully kinematically reconstructed atmospheric neutrinos, which has not been previously reported in water Cherenkov detectors. The CCQE fraction of this sample is 55%, and its neutrino (as opposed to antineutrino) fraction is 91.7±3%. We selected 78μ-like and 47 e-like events in the SK-I and SK-II data set. With this data, a clear zenith angle distortion of the neutrino direction itself is reported in a sub-GeV sample of μ neutrinos where the lepton angular correlation to the incoming neutrino is weak. Our fit to νμ→ντ oscillations using the neutrino LE distribution of the CCQE sample alone yields a wide acceptance region compatible with our previous results and excludes the no-oscillation hypothesis at 3-sigma.

AB - We report the development of a proton identification method for the Super-Kamiokande (SK) detector. This new tool is applied to the search for events with a single proton track, a high purity neutral current sample of interest for sterile neutrino searches. After selection using a neural network, we observe 38 events in the combined SK-I and SK-II data corresponding to 2285.1 days of exposure, with an estimated signal-to-background ratio of 1.6 to 1. Proton identification was also applied to a direct search for charged-current quasielastic (CCQE) events, obtaining a high precision sample of fully kinematically reconstructed atmospheric neutrinos, which has not been previously reported in water Cherenkov detectors. The CCQE fraction of this sample is 55%, and its neutrino (as opposed to antineutrino) fraction is 91.7±3%. We selected 78μ-like and 47 e-like events in the SK-I and SK-II data set. With this data, a clear zenith angle distortion of the neutrino direction itself is reported in a sub-GeV sample of μ neutrinos where the lepton angular correlation to the incoming neutrino is weak. Our fit to νμ→ντ oscillations using the neutrino LE distribution of the CCQE sample alone yields a wide acceptance region compatible with our previous results and excludes the no-oscillation hypothesis at 3-sigma.

UR - http://www.scopus.com/inward/record.url?scp=67649846478&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=67649846478&partnerID=8YFLogxK

U2 - 10.1103/PhysRevD.79.112010

DO - 10.1103/PhysRevD.79.112010

M3 - Article

AN - SCOPUS:67649846478

SN - 1550-7998

VL - 79

JO - Physical Review D - Particles, Fields, Gravitation and Cosmology

JF - Physical Review D - Particles, Fields, Gravitation and Cosmology

IS - 11

M1 - 112010

ER -

Kinematic reconstruction of atmospheric neutrino events in a large water Cherenkov detector with proton identification

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