Tau Neutrinos Favored over Sterile Neutrinos in Atmospheric Muon Neutrino Oscillations

Fukuda, Seisuke; Fukuda, Y.; Ishitsuka, M.; Itow, Y.; Kajita, T.; Kameda, J.; Kaneyuki, K.; Kobayashi, Kazuyoshi; Koshio, Y.; Miura, M.; Moriyama, S.; Nakahata, M.; Nakayama, S.; Obayashi, Y.; Okada, Atsushi; Okumura, K.; Sakurai, N.; Shiozawa, M.; Suzuki, Y.; Takeuchi, Hideki; Takeuchi, Y.; Toshito, T.; Totsuka, Y.; Yamada, S.; Earl, M.; Habig, A.; Kearns, E.; Messier, M. D.; Scholberg, K.; Stone, James 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.; Takemori, D.; Hayato, Y.; Ishii, T.; Kobayashi, T.; Nakamura, K.; Oyama, Y.; Sakai, Akito; Sakuda, M.; Sasaki, O.; Kohama, M.; Inagaki, T.; Nishikawa, K.; Haines, T. J.; Blaufuss, E.; Kim, B. K.; Sanford, R.; Svoboda, R.; Chen, M. L.; Goodman, J. A.; Guillian, G.; Sullivan, G. W.; Hill, J.; Jung, C. K.; Martens, K.; Malek, M.; Mauger, C.; McGrew, C.; Sharkey, E.; Viren, B.; Yanagisawa, C.; Kirisawa, Makoto; Inaba, S.; Mitsuda, C.; Miyano, K.; Okazawa, H.; Saji, C.; Takahashi, Miho; Takahata, M.; Nagashima, Y.; Nitta, K.; Takita, M.; Yoshida, Masato; Kim, S. B.; Ishizuka, T.; Etoh, M.; Gando, Y.; Hasegawa, T.; Inoue, K.; Ishihara, K.; Maruyama, T.; Shirai, J.; Suzuki, A.; Koshiba, M.; Hatakeyama, Yutaka; Ichikawa, Yasumasa; Koike, Masafumi; Nishijima, K.; Fujiyasu, H.; Ishino, H.; Morii, M.; Watanabe, Y.; Golebiewska, Urszula; Kiełczewska, D.; Boyd, S.; Stachyra, A. L.; Wilkes, R. J.; Young, K. K.

doi:10.1103/physrevlett.85.3999

Cited by 633 publications

(207 citation statements)

References 19 publications

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“…The disappearance probability reduces to the two neutrino case P (ν µ → ν µ ) = 1−sin 2 2θ 23 sin 2 ∆ being controlled by θ 23 , ∆m 2 31 , which we call leading parameters. These parameters have already been measured by atmospheric neutrino experiments [14,15,16] and will be determined better by conventional long baseline experiments [17,18,19,20]. A neutrino factory will allow precision measurements of θ 23 and ∆m 2 31 and the result will be limited mainly by systematical errors.…”

Section: Classification Of Oscillation Parametersmentioning

confidence: 99%

Systematic exploration of the neutrino factory parameter space including errors and correlations

2001

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We discuss in a systematic way the extraction of neutrino masses, mixing angles and leptonic CP violation at neutrino factories. Compared to previous studies we put a special emphasis on improved statistical methods and on the multidimensional nature of the combined fits of the ν e → ν µ ,ν e →ν µ appearance and ν µ → ν µ ,ν µ →ν µ disappearance channels. Uncertainties of all involved parameters and statistical errors are included. We find previously ignored correlations in the multidimensional parameter space, leading to modifications in the physics reach, which amount in some cases to one order of magnitude. Including proper statistical errors we determine for all parameters the improved sensitivity limits for various baselines, beam energies, neutrino fluxes and detector masses. Our results allow a comparison of the physics potential for different choices of baseline and beam energy with regard to all involved parameters. In addition we discuss in more detail the problem of parameter degeneracies in measurements of δ CP .

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Section: Classification Of Oscillation Parametersmentioning

confidence: 99%

Systematic exploration of the neutrino factory parameter space including errors and correlations

2001

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“…not just < P µ > = (U/D) µ from the multi-GeV muons above) gives < P µ > = 0.50 ± 0.04 whereby 0.36 < ∼ |U µ3 | 2 < ∼ 0.64 (68% CL), certainly consistent with |U µ3 | 2 = 1/2 and twofold maximal mixing. Independent evidence for strong ν τ mixing comes from the observation of a substantive charged-current ν τ appearance signal, statistically separated from the neutral-current sample in SUPER-K [18].…”

Section: The Trend Of the Datamentioning

confidence: 99%

Tri-bimaximal mixing and the neutrino oscillation data

2002

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Following recent results from the SNO solar neutrino experiment and the K2K long-baseline neutrino experiment, the combined existing data on neutrino oscillations now point strongly to a specific form for the lepton mixing matrix, with effective bimaximal mixing of ν µ and ν τ at the atmospheric scale and effective trimaximal mixing for ν e with ν µ and ν τ at the solar scale (hence 'tri-bimaximal' mixing). We give simple mass-matrices leading to tri-bimaximal mixing, and discuss its relation to the Fritzsch-Xing democratic ansatz.

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“…For example, one may reason in the framework of 2+2 four-neutrino schemes 6 (see [7,20,21,22,23] and references therein), where transitions of active in sterile neutrinos is predicted in solar or atmospheric neutrino experiments. Since no such transitions have been seen in atmospheric neutrino experiments [60,61], one could consider reasonable the null hypothesis that the solar neutrino problem is due to practically pure ν e → ν s transitions 7 .…”

Section: Rates Analysismentioning

confidence: 99%

Bayesian view of solar neutrino oscillations

Garzelli

Giunti

2001

J. High Energy Phys.

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We present the results of a Bayesian analysis of solar neutrino data in terms of ν e → ν µ,τ and ν e → ν s oscillations, where ν s is a sterile neutrino. We perform a Rates Analysis of the rates of solar neutrino experiments, including the first SNO CC result, and spectral data of the CHOOZ experiment, and a Global Analysis that takes into account also the Super-Kamiokande day and night electron energy spectra. We show that the Bayesian analysis of solar neutrino data does not suffer any problem from the inclusion of the numerous bins of the CHOOZ and Super-Kamiokande electron energy spectra and allows to reach the same conclusions on the favored type of neutrino transitions and on the determination of the most favored values of the oscillation parameters in both the Rates and Global Analysis. Our Bayesian analysis shows that ν e → ν s transitions are strongly disfavored with respect to ν e → ν µ,τ transitions. In the case of ν e → ν µ,τ oscillations, the Large Mixing Angle region is favored by the data (86% probability), the LOW region has some small chance (13% probability), the Vacuum Oscillation region is almost excluded (1% probability) and the Small Mixing Angle region is practically excluded (0.01% probability). We calculate also the marginal posterior probability distributions for tan 2 ϑ and ∆m 2 in the case of ν e → ν µ,τ oscillations and we show that the data imply large mixing almost with certainty and large values of ∆m 2 are favored (2 × 10 −6 eV 2 < ∆m 2 < 10 −3 eV 2 with 86% probability). We present also the results of a standard least-squares analysis of solar neutrino data and we show that the standard goodness of fit test is not able to reject pure ν e → ν s transitions. The likelihood ratio test, which is insensitive to the number of bins of the CHOOZ and Super-Kamiokande energy spectra, allows to reject pure ν e → ν s transitions in favor of ν e → ν µ,τ transitions only in the Global Analysis.

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Tau Neutrinos Favored over Sterile Neutrinos in Atmospheric Muon Neutrino Oscillations

Cited by 633 publications

References 19 publications

Systematic exploration of the neutrino factory parameter space including errors and correlations

Systematic exploration of the neutrino factory parameter space including errors and correlations

Tri-bimaximal mixing and the neutrino oscillation data

Bayesian view of solar neutrino oscillations

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