Abstract
With the announcement of new evidence for muon neutrino disappearance observed by the super-Kamiokande experiment, the more than a decade old atmospheric neutrino anomaly moved from a possible indication for neutrino oscillations to an apparently inescapable fact. The evidence is reviewed, and new indications are presented that the oscillations are probably between muon and tau neutrinos. Implications and future directions are discussed.
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References
J Haines et al, Phys. Rev. Lett. 57, 1986 (1986)
IMB Collaboration: R Clark et al, Phys. Rev. Lett. 79, 345 (1997)
R Becker-Szendy et al, Phys. Rev. D46, 3720 (1992)
D Casper et al, Phys. Rev. Lett. 66, 2561 (1991)
Kamiokande Collaboration: Y Oyama et al, hep-ex/9706008 (1997)
K S Hirata et al, Phys. Lett. B205, 416 (1988)
K S Hirata et al, Phys. Lett. B280, 146 (1992)
Y Fukuda et al, Phys. Lett. B335, 237 (1994)
John G Learned, Sandip Pakvasa and Thomas J Weiler, Phys. Lett. B207, 79 (1988)
V Barger and K Whisnant, Phys. Lett. B209, 365 (1988)
K Hidaka, M Honda and S Midorikawa, Phys. Rev. Lett. 61, 1537 (1988)
Paolo Lipari, T K Gaisser and Todor Stanev, Phys. Rev. D58, 73003 (1998) preprint astroph/9803093, and references therein
See also report of Atmospheric Neutrino Working Group, D Casper et al, in these Proceedings
http://www-sk.icrr.u-tokyo.ac.jp/doc/sk/pub/
The super-Kamiokande Collaboration: Y Fukuda et al, Phys. Lett. B433, 9 (1998), preprint hep-ex/9803006
The super-Kamiokande Collaboration: Y Fukuda et al, Phys. Lett. B436, 33 (1998) hep-ex/9805006
The super-Kamiokande Collaboration: T Futagami et al, Phys. Rev. Lett. 82, 5194 (1999) preprint astro-ph/9901139
The super-Kamiokande Collaboration: Y Fukuda et al, Phys. Rev. Lett. 81, 1562 (1998) preprint hep-ex/9807003
Measurement of the flux and zenith-angle distribution of upward through-going muons by super-Kamiokande, The Super-Kamiokande Collaboration: Y Fukuda et al, Phys. Rev. Lett. 82, 2644 (1999) preprint hep-ex/9812014
John W Flanagan, John G Learned and Sandip Pakvasa, Phys. Rev. D57, 2649 (1998) preprint hep-ph/9709438
Also see J W Flanagan dissertation, UH 1997, available at the SK web page
See PhD dissertation of M Messier, BU 1999 for derivation of the correction used for translating observed energy into L/E. This author has used a different form and definition in the past. The figure presented is the SuperK official plot
V Barger, J G Learned, S Pakvasa and T J Weiler, Phys. Rev. Lett. 82, 2640 (1999) preprint astro-ph/9810121
V Barger, J G Learned, P Lipari, M Lusignoli, S Pakvasa and T J Weiler, Phys. Lett. B462, 109 (1999) preprint hep-ph/9907421
P Antonioli et al, to be published in NIM in the Proceedings of the RICH98 Workshop in Israel, preprint CERN-LAA/99-03, 5/5/99, and talk of T Ypsilantis at this Workshop
Nonetheless, this author (personal opinion, not collaboration) suspects that the process pulls the minima slightly towards lower values of δm 2. The reasoning is that the introduced parameters un-weight the effect of R on the fitting, which pulls upwards, while the shape pulls downwards. The author’s bet remains that δm 2 settles at around 5 × 10−3 eV2, whereas the official fits give 2.5 to 3.5
A D Sakharov, JETP Lett. 5, 24 (1967)
V A Kuzmin, JETP Lett. 12, 228 (1970)
Baryogenesis via neutrino oscillations, E Kh Akhmedov, V A Rubakov and A Yu Smirnov, Phys. Rev. Lett. 81, 1359 (1998)
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Learned, J.G. Results from atmospheric neutrinos. Pramana - J Phys 55, 3–18 (2000). https://doi.org/10.1007/s12043-000-0079-0
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DOI: https://doi.org/10.1007/s12043-000-0079-0