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Measurement of atmospheric neutrino flux consistent with tau neutrino appearance |
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| Authors: | Abe K Hayato Y Iida T Ishihara K Kameda J Koshio Y Minamino A Mitsuda C Miura M Moriyama S Nakahata M Obayashi Y Ogawa H Shiozawa M Suzuki Y Takeda A Takeuchi Y Ueshima K Higuchi I Ishihara C Ishitsuka M Kajita T Kaneyuki K Mitsuka G Nakayama S Nishino H Okumura K Saji C Takenaga Y Totsuka Y Clark S Desai S Dufour F Kearns E Likhoded S Litos M Raaf J L Stone J L Sulak L R Wang W Goldhaber M Casper D Cravens J P Kropp W R Liu D W Mine S Regis C Smy M B Sobel H W Vagins M R Ganezer K S Hill J E Keig W E Jang J S Kim J Y Lim I T Scholberg K Tanimoto N Walter C W Wendell R Ellsworth R W Tasaka S |
| Affiliation: | Kamioka Observatory, Institute for Cosmic Ray Research, University of Tokyo, Kamioka, Gifu 506-1205, Japan. |
| Abstract: | A search for the appearance of tau neutrinos from nu(mu) <--> nu(tau) oscillations in the atmospheric neutrinos has been performed using 1489.2 days of atmospheric neutrino data from the Super-Kamiokande-I experiment. A best fit tau neutrino appearance signal of 138+/-48(stat)-32(+15)(syst) events is obtained with an expectation of 78+/-26(syst). The hypothesis of no tau neutrino appearance is disfavored by 2.4 sigma. |
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