Observation of the East-West Anisotropy of the Atmospheric Neutrino Flux

Futagami, T.; Fukuda, Y.; Hayakawa, T.; Inoue, K.; Ishihara, K.; Ishino, H.; Itow, Y.; Kajita, T.; Kameda, J.; Kasuga, S.; Kobayashi, Kazuyoshi; Kobayashi, Yoshiyuki; Koshio, Y.; Miura, Makoto; Nakahata, M.; Nakayama, S.; Obayashi, Y.; Okada, Atsushi; Okumura, K.; Sakurai, N.; Shiozawa, M.; Suzuki, Y.; Takeuchi, Hideki; Takeuchi, Y.; Totsuka, Y.; Yamada, S.; Earl, M.; Habig, A.; Kearns, E.; Messier, M. D.; Scholberg, K.; Stone, J. L.; Sulak, L.; Walter, C. W.; Goldhaber, M.; Barszczak, T.; Casper, D.; Gajewski, W.; Kropp, W. R.; Mine, S.; Price, L. R.; Smy, M.; Sobel, H. W.; Vagins, M. R.; Ganezer, K. S.; Keig, W. E.; Ellsworth, R. W.; Tasaka, S.; Kibayashi, A.; Learned, J. G.; Matsuno, S.; Stenger, V. J.; Takemori, D.; Ishii, T.; Kanzaki, J.; Kobayashi, T.; Nakamura, K.; Nishikawa, K.; Oyama, Y.; Sakai, Akito; Sakuda, M.; Sasaki, O.; Echigo, S.; Kohama, M.; Haines, T. J.; Blaufuss, E.; Kim, B. K.; Sanford, R.; Svoboda, R.; Chen, M. L.; Goodman, J. A.; Sullivan, G. W.; Hill, J.; Jung, C. K.; Martens, K.; Mauger, C.; McGrew, C.; Sharkey, E.; Viren, B.; Yanagisawa, C.; Doki, W.; Kirisawa, Makoto; Inaba, S.; Miyano, K.; Okazawa, H.; Saji, C.; Takahashi, Miho; Takahata, M.; Higuchi, Koji; Nagashima, Y.; Takita, M.; Yamaguchi, Tomohiro; Yoshida, Masato; Kim, S. B.; Etoh, M.; Hasegawa, T.; Hasegawa, T.; Hatakeyama, S.; Iwamoto, Toshiyuki; Koga, M.; Maruyama, T.; Ogawa, Hiroshi; Shirai, J.; Suzuki, A.; Tsushima, F.; Koshiba, M.; Hatakeyama, Yutaka; Koike, Masafumi; Nemoto, Mariko; Nishijima, K.; Fujiyasu, H.; Hayato, Y.; Kanaya, Yoshio; Kaneyuki, K.; Watanabe, Y.; Kiełczewska, D.; George, Jimin; Stachyra, A. L.; Wai, L.; Wilkes, R. J.; Young, K. K.

doi:10.1103/physrevlett.82.5194

Cited by 79 publications

(20 citation statements)

References 12 publications

(7 reference statements)

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“…Super-K previously measured the directional asymmetry of the neutrino flux (5σ for electron neutrino and 2σ for muon neutrino), known as the east-west effect [4], with a 45 kton·yr exposure of the detector. The asymmetry is caused by the deflection of comic rays in the earth's geo-magnetic field.…”

Section: Measurement Of Atmospheric Neutrino Fluxmentioning

confidence: 99%

Atmospheric Neutrino Results from Super-Kamiokande

Li¹

2017

Proceedings of 38th International Conference on High Energy Physics — PoS(ICHEP2016)

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Recent results of the Super-Kamiokande atmospheric neutrino analysis are presented. SuperKamiokande has measured the flux of atmospheric neutrinos with energies from 100 MeV to 10 TeV, and measured the east-west effect to 8.0 (6.0)σ for electron (muon) neutrinos. The search for tau neutrino appearance from neutrino oscillations has resulted in a 4.6σ deviation from the hypothesis of no tau neutrino appearance. Super-Kamiokande data have a weak preference for normal mass hierarchy (∆χ 2 = χ 2 NH − χ 2 IH = −4.3) including the constraints from the reactor neutrino experiments, and the preference is strengthened (∆χ 2 = χ 2 NH − χ 2 IH = −5.2) after including constraints from the T2K experiment.

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Section: Measurement Of Atmospheric Neutrino Fluxmentioning

confidence: 99%

Atmospheric Neutrino Results from Super-Kamiokande

Li¹

2017

Proceedings of 38th International Conference on High Energy Physics — PoS(ICHEP2016)

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“…Indeed the SuperK data do exhibit significant variation from uniformity while fitting the flux predictions very well, giving one confidence in the modeling [28].…”

Section: Neutrino Flux Dependence Upon Terrestrial Magnetic Fieldmentioning

confidence: 59%

The Atmospheric Neutrino Anomaly: Muon Neutrino Disappearance

Learned¹

2001

Current Aspects of Neutrino Physics

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“…Reducing the vertical extent of the detector revealed the effect to be there. The impact on the observed leptons is however, restricted to a small overall increase in flux and a small but significant improvement in understanding the so-called "east-west effect" seen in the Super-Kamiokande (SK) data [10,11]. Other than this, neither our work nor Battistoni's report a large difference between the 1-D and 3-D approaches.…”

Section: Introductionmentioning

confidence: 57%

A three-dimensional calculation of atmospheric neutrino fluxes

Tserkovnyak¹,

Komar²,

Nally³

et al. 2003

Astroparticle Physics

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We present a three-dimensional calculation of atmospheric neutrino fluxes using accurate models of the geomagnetic field, hadronic interactions, tracking and decays. Results are presented for the Super-Kamiokande (SK) and Sudbury Neutrino Observatory (SNO) sites using the GEANT-FLUKA hadronic code. We make a comparison with previous one-dimensional calculations and other three-dimensional results. The recently reported geometrical enhancement of low energy, horizontal neutrinos is confirmed. The effect on observed leptons is however, restricted to a small overall increase in flux. We report east-west asymmetries for each of the neutrino species.

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Observation of the East-West Anisotropy of the Atmospheric Neutrino Flux

Cited by 79 publications

References 12 publications

Atmospheric Neutrino Results from Super-Kamiokande

Atmospheric Neutrino Results from Super-Kamiokande

The Atmospheric Neutrino Anomaly: Muon Neutrino Disappearance

A three-dimensional calculation of atmospheric neutrino fluxes

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