Search for electron neutrino appearance in a 250 km long-baseline experiment

M. H. Ahn; S. Aoki; Y. Ashie; H. Bhang; S. Boyd; D. Casper; J. H. Choi; S. Fukuda; Y. Fukuda; R. Gran; T. Hara; M. Hasegawa; T. Hasegawa; K. Hayashi; Y. Hayato; J. Hill; A. K. Ichikawa; A. Ikeda; T. Inagaki; T. Ishida; T. Ishii; M. Ishitsuka; Y. Itow; T. Iwashita; H. I. Jang; J. S. Jang; E. J. Jeon; K. K. Joo; C. K. Jung; C. O. Kim; S. B. Kim; K. Kobayashi; T. Kobayashi; T. Maruyama; K. Miyano; T. Morita; K. Nakamura; S. Nakayama; H. Park; T. Sasaki; M. Sekiguchi; K. K. Shiraishi; A. Suzuki; Y. Suzuki; M. Tanaka; S. Ueda; W. Wang; S. Yamada; S. Yamamoto; M. Yoshida

doi:10.1103/PhysRevLett.93.051801

Search for electron neutrino appearance in a 250 km long-baseline experiment

M. H. Ahn, S. Aoki, Y. Ashie, H. Bhang, S. Boyd, D. Casper, J. H. Choi, S. Fukuda, Y. Fukuda, R. Gran, T. Hara, M. Hasegawa, T. Hasegawa, K. Hayashi, Y. Hayato, J. Hill, A. K. Ichikawa, A. Ikeda, T. Inagaki, T. IshidaT. Ishii, M. Ishitsuka, Y. Itow, T. Iwashita, H. I. Jang, J. S. Jang, E. J. Jeon, K. K. Joo, C. K. Jung, C. O. Kim, S. B. Kim, K. Kobayashi, T. Kobayashi, T. Maruyama, K. Miyano, T. Morita, K. Nakamura, S. Nakayama, H. Park, T. Sasaki, M. Sekiguchi, K. K. Shiraishi, A. Suzuki, Y. Suzuki, M. Tanaka, S. Ueda, W. Wang, S. Yamada, S. Yamamoto, M. Yoshida

Engineering Science for Advanced energy system

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Abstract

The search for electron neutrino appearance from accelerator-produced muon neutrinos in the K2K 250 km long-baseline neutrino experiment was described. It was observed that one electron event was found in the data corresponding to an exposure of 4.8 × 10¹⁹ protons on target. The number of expected background neutrino events in the absence of neutrino oscillations was found to be 2.4±0.6 events and was found to be dominated by misidentification of events from neutral current production. The probability density function of the expected number of electron events was evaluated from the the Poisson distribution, which was convoluted with systematic uncertainty.

Original language	English
Article number	051801
Pages (from-to)	051801-1-051801-5
Journal	Physical review letters
Volume	93
Issue number	5
DOIs	https://doi.org/10.1103/PhysRevLett.93.051801
Publication status	Published - Jul 30 2004

All Science Journal Classification (ASJC) codes

Physics and Astronomy(all)

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10.1103/PhysRevLett.93.051801

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Ahn, M. H., Aoki, S., Ashie, Y., Bhang, H., Boyd, S., Casper, D., Choi, J. H., Fukuda, S., Fukuda, Y., Gran, R., Hara, T., Hasegawa, M., Hasegawa, T., Hayashi, K., Hayato, Y., Hill, J., Ichikawa, A. K., Ikeda, A., Inagaki, T., ... Yoshida, M. (2004). Search for electron neutrino appearance in a 250 km long-baseline experiment. Physical review letters, 93(5), 051801-1-051801-5. Article 051801. https://doi.org/10.1103/PhysRevLett.93.051801

Ahn, MH, Aoki, S, Ashie, Y, Bhang, H, Boyd, S, Casper, D, Choi, JH, Fukuda, S, Fukuda, Y, Gran, R, Hara, T, Hasegawa, M, Hasegawa, T, Hayashi, K, Hayato, Y, Hill, J, Ichikawa, AK, Ikeda, A, Inagaki, T, Ishida, T, Ishii, T, Ishitsuka, M, Itow, Y, Iwashita, T, Jang, HI, Jang, JS, Jeon, EJ, Joo, KK, Jung, CK, Kim, CO, Kim, SB, Kobayashi, K, Kobayashi, T, Maruyama, T, Miyano, K, Morita, T, Nakamura, K, Nakayama, S, Park, H, Sasaki, T, Sekiguchi, M, Shiraishi, KK, Suzuki, A, Suzuki, Y, Tanaka, M, Ueda, S, Wang, W, Yamada, S, Yamamoto, S & Yoshida, M 2004, 'Search for electron neutrino appearance in a 250 km long-baseline experiment', Physical review letters, vol. 93, no. 5, 051801, pp. 051801-1-051801-5. https://doi.org/10.1103/PhysRevLett.93.051801

@article{99ecd41745b549caad6a14f234edc8c0,

title = "Search for electron neutrino appearance in a 250 km long-baseline experiment",

abstract = "The search for electron neutrino appearance from accelerator-produced muon neutrinos in the K2K 250 km long-baseline neutrino experiment was described. It was observed that one electron event was found in the data corresponding to an exposure of 4.8 × 1019 protons on target. The number of expected background neutrino events in the absence of neutrino oscillations was found to be 2.4±0.6 events and was found to be dominated by misidentification of events from neutral current production. The probability density function of the expected number of electron events was evaluated from the the Poisson distribution, which was convoluted with systematic uncertainty.",

author = "Ahn, {M. H.} and S. Aoki and Y. Ashie and H. Bhang and S. Boyd and D. Casper and Choi, {J. H.} and S. Fukuda and Y. Fukuda and R. Gran and T. Hara and M. Hasegawa and T. Hasegawa and K. Hayashi and Y. Hayato and J. Hill and Ichikawa, {A. K.} and A. Ikeda and T. Inagaki and T. Ishida and T. Ishii and M. Ishitsuka and Y. Itow and T. Iwashita and Jang, {H. I.} and Jang, {J. S.} and Jeon, {E. J.} and Joo, {K. K.} and Jung, {C. K.} and Kim, {C. O.} and Kim, {S. B.} and K. Kobayashi and T. Kobayashi and T. Maruyama and K. Miyano and T. Morita and K. Nakamura and S. Nakayama and H. Park and T. Sasaki and M. Sekiguchi and Shiraishi, {K. K.} and A. Suzuki and Y. Suzuki and M. Tanaka and S. Ueda and W. Wang and S. Yamada and S. Yamamoto and M. Yoshida",

note = "Funding Information: We thank the KEK and ICRR Directorates for their strong support and encouragement. K2K is made possible by the inventiveness and the diligent efforts of the KEK-PS machine and beam channel groups. We thankfully appreciate discussions on the statistical treatment with Dr. Louis Lyons. We gratefully acknowledge the cooperation of the Kamioka Mining and Smelting Company. This work has been supported by the Ministry of Education, Culture, Sports, Science and Technology, Government of Japan and its grants for Scientific Research, the Japan Society for Promotion of Science, the U.S. Department of Energy, the Korea Research Foundation, the Korea Science and Engineering Foundation, the CHEP in Korea, and Polish KBN Grant No. 5P03B06531.",

year = "2004",

month = jul,

day = "30",

doi = "10.1103/PhysRevLett.93.051801",

language = "English",

volume = "93",

pages = "051801--1--051801--5",

journal = "Physical review letters",

issn = "0031-9007",

publisher = "American Physical Society",

number = "5",

}

TY - JOUR

T1 - Search for electron neutrino appearance in a 250 km long-baseline experiment

AU - Ahn, M. H.

AU - Aoki, S.

AU - Ashie, Y.

AU - Bhang, H.

AU - Boyd, S.

AU - Casper, D.

AU - Choi, J. H.

AU - Fukuda, S.

AU - Fukuda, Y.

AU - Gran, R.

AU - Hara, T.

AU - Hasegawa, M.

AU - Hasegawa, T.

AU - Hayashi, K.

AU - Hayato, Y.

AU - Hill, J.

AU - Ichikawa, A. K.

AU - Ikeda, A.

AU - Inagaki, T.

AU - Ishida, T.

AU - Ishii, T.

AU - Ishitsuka, M.

AU - Itow, Y.

AU - Iwashita, T.

AU - Jang, H. I.

AU - Jang, J. S.

AU - Jeon, E. J.

AU - Joo, K. K.

AU - Jung, C. K.

AU - Kim, C. O.

AU - Kim, S. B.

AU - Kobayashi, K.

AU - Kobayashi, T.

AU - Maruyama, T.

AU - Miyano, K.

AU - Morita, T.

AU - Nakamura, K.

AU - Nakayama, S.

AU - Park, H.

AU - Sasaki, T.

AU - Sekiguchi, M.

AU - Shiraishi, K. K.

AU - Suzuki, A.

AU - Suzuki, Y.

AU - Tanaka, M.

AU - Ueda, S.

AU - Wang, W.

AU - Yamada, S.

AU - Yamamoto, S.

AU - Yoshida, M.

N1 - Funding Information: We thank the KEK and ICRR Directorates for their strong support and encouragement. K2K is made possible by the inventiveness and the diligent efforts of the KEK-PS machine and beam channel groups. We thankfully appreciate discussions on the statistical treatment with Dr. Louis Lyons. We gratefully acknowledge the cooperation of the Kamioka Mining and Smelting Company. This work has been supported by the Ministry of Education, Culture, Sports, Science and Technology, Government of Japan and its grants for Scientific Research, the Japan Society for Promotion of Science, the U.S. Department of Energy, the Korea Research Foundation, the Korea Science and Engineering Foundation, the CHEP in Korea, and Polish KBN Grant No. 5P03B06531.

PY - 2004/7/30

Y1 - 2004/7/30

N2 - The search for electron neutrino appearance from accelerator-produced muon neutrinos in the K2K 250 km long-baseline neutrino experiment was described. It was observed that one electron event was found in the data corresponding to an exposure of 4.8 × 1019 protons on target. The number of expected background neutrino events in the absence of neutrino oscillations was found to be 2.4±0.6 events and was found to be dominated by misidentification of events from neutral current production. The probability density function of the expected number of electron events was evaluated from the the Poisson distribution, which was convoluted with systematic uncertainty.

AB - The search for electron neutrino appearance from accelerator-produced muon neutrinos in the K2K 250 km long-baseline neutrino experiment was described. It was observed that one electron event was found in the data corresponding to an exposure of 4.8 × 1019 protons on target. The number of expected background neutrino events in the absence of neutrino oscillations was found to be 2.4±0.6 events and was found to be dominated by misidentification of events from neutral current production. The probability density function of the expected number of electron events was evaluated from the the Poisson distribution, which was convoluted with systematic uncertainty.

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U2 - 10.1103/PhysRevLett.93.051801

DO - 10.1103/PhysRevLett.93.051801

M3 - Article

AN - SCOPUS:69349106870

SN - 0031-9007

VL - 93

SP - 051801-1-051801-5

JO - Physical review letters

JF - Physical review letters

IS - 5

M1 - 051801

ER -

Search for electron neutrino appearance in a 250 km long-baseline experiment

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