Measurement of atmospheric neutrino oscillation parameters by Super-Kamiokande I

Ashie, Y.; Hosaka, J.; Ishihara, K.; Itow, Y.; Kameda, J.; Koshio, Y.; Minamino, A.; Mitsuda, C.; Miura, M.; Moriyama, S.; Nakahata, M.; Namba, T.; Nambu, R.; Obayashi, Y.; Shiozawa, M.; Suzuki, Yoshihiro; Takeuchi, Y.; Taki, K.; Yamada, S.; Ishitsuka, M.; Kajita, T.; Kaneyuki, K.; Nakayama, S.; Okada, Atsushi; Okumura, K.; Saji, C.; Takenaga, Y.; Clark, S.; Desai, S.; Kearns, E.; Likhoded, S.; Stone, J. L.; Sulak, L.; Wang, W.; Goldhaber, M.; Casper, D.; Cravens, J. P.; Gajewski, W.; Kropp, W. R.; Liu, D. W.; Mine, S.; Smy, M. B.; Sobel, H. W.; Sterner, C. W.; Vagins, M. R.; Ganezer, K. S.; Hill, J.; Keig, W. E.; Jang, J. S.; Kim, J. Y.; Lim, I. T.; Scholberg, K.; Walter, C. W.; Ellsworth, R. W.; Tasaka, S.; Guillian, G.; Kibayashi, A.; Learned, J. G.; Matsuno, S.; Takemori, D.; Messier, M. D.; Hayato, Y.; Ichikawa, A. K.; Ishida, Toru; Ishii, T.; Iwashita, T.; Kobayashi, T.; Maruyama, T.; Nakamura, K.; Nitta, K.; Oyama, Y.; Sakuda, M.; Totsuka, Y.; Hasegawa, M.; Hayashi, Kenji; Kato, I.; Maesaka, H.; Morita, T.; Nakaya, T.; Nishikawa, K.; Sasaki, T.; Ueda, S.; Yamamoto, Shuji; Haines, T. J.; Dazeley, S.; Hatakeyama, S.; Svoboda, R.; Blaufuss, E.; Goodman, J. A.; Sullivan, G. W.; Turčan, D.; Habig, A.; Fukuda, Y.; Jung, C. K.; Kato, Takashi; Kobayashi, Kazuyoshi; Malek, M.; Mauger, C.; McGrew, C.; Sarrat, A.; Sharkey, E.; Yanagisawa, C.; Toshito, T.; Miyano, K.; Tamura, N.; Ishii, Junko; Kuno, Y.; Yoshida, Masato; Kim, S. B.; Yoo, J.; Okazawa, H.; Ishizuka, T.; Choi, Y.; Seo, H.; Gando, Y.; Hasegawa, T.; Inoue, K.; Shirai, J.; Suzuki, A.; Koshiba, M.; Nakajima, Yasuhiro; Nishijima, K.; Harada, Takaaki; Ishino, H.; Watanabe, Y.; Kiełczewska, D.; Zalipska, J.; Berns, H.; Gran, R.; Shiraishi, Kiyoshi; Stachyra, A. L.; Washburn, K.; Wilkes, R. J.

doi:10.1103/physrevd.71.112005

Cited by 792 publications

(584 citation statements)

References 78 publications

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“…Neutrino oscillation was firmly established in the late 1990s with the observation by the Super-Kamiokande (SK) experiment that muon neutrinos produced by cosmic ray interactions in our atmosphere changed their flavor [1]. Measurements from the Sudbury Neutrino Observatory a few years later, in combination with SK data, revealed that neutrino oscillation was responsible for the apparent deficit of electron neutrinos produced in the Sun [2].…”

Section: Introductionmentioning

confidence: 96%

“…The ν e CC selection criteria a-e in Table XIV are based on the information provided by SK event reconstruction software which has been used at SK for atmospheric neutrino and nucleon decay analyses [1] and, as shown in the Table, we reject most of the background events by these selection cuts. The ν e appearance signal purity is 59.3% and the selection efficiency for the signal is 71.8%.…”

Section: B π 0 Rejection With the New Event Reconstruction Algorithmmentioning

confidence: 99%

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Measurements of neutrino oscillation in appearance and disappearance channels by the T2K experiment with6.6×1020protons on target

Abe¹,

Adam²,

Aihara³

et al. 2015

Phys. Rev. D

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We report on measurements of neutrino oscillation using data from the T2K long-baseline neutrino experiment collected between 2010 and 2013. In an analysis of muon neutrino disappearance alone, we find the following estimates and 68% confidence intervals for the two possible mass hierarchies: normal hierarchy∶ sin 2 θ 23 ¼ 0.514 þ0.055 −0.056 and Δm 2 32 ¼ ð2.51 AE 0.10Þ × 10 −3 eV 2 =c 4 and inverted hierarchy∶ sin 2 θ 23 ¼ 0.511 AE 0.055 and Δm 2 13 ¼ ð2.48 AE 0.10Þ × 10 −3 eV 2 =c 4 . The analysis accounts for multinucleon mechanisms in neutrino interactions which were found to introduce negligible bias. We describe our first analyses that combine measurements of muon neutrino disappearance and electron neutrino appearance to estimate four oscillation parameters, jΔm 2 j, sin 2 θ 23 , sin 2 θ 13 , δ CP , and the mass hierarchy. Frequentist and Bayesian intervals are presented for combinations of these parameters, with and without including recent reactor measurements. At 90% confidence level and including reactor measurements, we exclude the region δ CP ¼ ½0.15; 0.83 π for normal hierarchy and δ CP ¼ ½−0.08; 1.09 π for inverted hierarchy. The T2K and reactor data weakly favor the normal hierarchy with a Bayes factor of 2.2. The most probable values and 68% one-dimensional credible intervals for the other oscillation parameters, when reactor data are included, are sin 2 θ 23 ¼ 0.528 þ0.055 −0.038 and jΔm 2 32 j ¼ ð2.51 AE 0.11Þ × 10 −3 eV 2 =c 4 .

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Section: Introductionmentioning

confidence: 96%

Section: B π 0 Rejection With the New Event Reconstruction Algorithmmentioning

confidence: 99%

Measurements of neutrino oscillation in appearance and disappearance channels by the T2K experiment with6.6×1020protons on target

Abe¹,

Adam²,

Aihara³

et al. 2015

Phys. Rev. D

Self Cite

279

376

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“…The full procedure is detailed in the following subsections. More information on reconstruction can be found in papers ( [85]), theses ([46] and [86]), and proceedings ( [87]). …”

Section: Reconstructionmentioning

confidence: 99%

“…Only fully contained events have been used (so far) in T2K analysis, so PC and UPMU events will be ignored for now. For more information on all reduction processes, see [85], [61], [46], and [86].…”

Section: Atmospheric Reductionmentioning

confidence: 99%

“…There are two neutrino interaction generators used for T2K: GENIE (Generates Events for Neutrino Interaction Experiments) [115] and NEUT [116] [117]. NEUT is a generator used for Super-Kamiokande atmospheric neutrino analyses [85], and was used for computing cross-sections and generating events from the beam flux in the T2K MC. GENIE was used as a cross-check for the T2K MC, and for estimating cross-section systematic errors.…”

Section: Neutrino Interactionsmentioning

confidence: 99%

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Indication of Electron Neutrino Appearance from an Accelerator-Produced Off-Axis Muon Neutrino Beam

Abe¹,

Abgrall²,

Ajima³

et al. 2011

Phys. Rev. Lett.

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1,204

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T2K (Tokai to Kamioka) is a long baseline neutrino experiment with the primary goal of measuring the neutrino mixing angle θ 13 . It uses a muon neutrino beam, produced at the J-PARC accelerator facility in Tokai, sent through a near detector complex on its way to the far detector, Super-Kamiokande. Appearance of electron neutrinos at the far detector due to oscillation is used to measure the value of θ 13 .

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2020

Solar Neutrino Physics

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Measurement of atmospheric neutrino oscillation parameters by Super-Kamiokande I

Cited by 792 publications

References 78 publications

Measurements of neutrino oscillation in appearance and disappearance channels by the T2K experiment with6.6×1020protons on target

Measurements of neutrino oscillation in appearance and disappearance channels by the T2K experiment with6.6×1020protons on target

Indication of Electron Neutrino Appearance from an Accelerator-Produced Off-Axis Muon Neutrino Beam

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