Abstract
The K2K experiment observed indications of neutrino oscillation after 250 km flight of υμ. The observed number of events in the data corresponding to 4.8 x 1019 protons on target is 56, while 80.1 +6.25.4 is expected. Both the decrease of the events and observed spectrum shape distortion are consistent with neutrino oscillation. The probability that the observations are statistical fluctuation of non oscillation is less than 1%. The allowed region of oscillation parameters is consistent with the one obtained from the atmospheric neutrino observation. After the accident of Super-Kamiokande (SK) detector, the reconstruction of SK has finished in 2002 and the K2K experiment resumed in December 2002.
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References
S. H. Ahn et al. Detection of accelerator produced neutrinos at a distance of 250-km. Phys. Lett., B511:178–184, 2001.
Y. Fukuda et al. Evidence for oscillation of atmospheric neutrinos. Phys. Rev. Lett., 81:1562–1567, 1998.
S. Fukuda et al. Determinatio of solar neutrino oscillation parameters using 1496 days of super-kamiokande i data. Phys. Lett., B539:179–187, 2002.
M. H. Ahn et al. Indications of neutrino oscillation in a 250-km long-baseline experiment. Phys. Rev. Lett., 90:041801, 2003.
M. Ieiri et al. Magnetic horn for a long-baseline neutrino oscillation experiment at kek. 1997. Prepared for 11th Symposium on Accelerator Technology and Science, Hyogo, Japan, 21–23 Oct 1997.
A. Suzuki et al. Design, construction, and operation of scifi tracking detector for k2k experiment. Nucl. Instrum. Meth., A453:165–176, 2000.
T. Ishii et al. Near muon range detector for k2k experiment: Construction and performance. Nucl. Instrum. Meth., A482:244–253, 2002.
T. Maruyama. First observation of accelerator origin neutrino beam after passing through 250 km of earth. Ph.D. thesis (Tohoku Unversity), 2000.
T. Kobayashi. Translation from near to far at k2k. J. Phys., G29:1911–1914, 2003.
Y. Fukuda et al. Measurement of a small atmospheric υμ/υe ratio. Phys. Lett., B433:9–18, 1998.
M Yoshida. K2k: Full active scintillator tracker. Talk presented at International Workshop on Nuclear and Particle Physics at 50-GeV PS, 2002 at Kyoto University, http://www-jhf.kek.jp/NP02.
Emilio Radicioni. Harp: A hadron production experiment. 2002.
http://neutrino.kek.jp/jhfnu.
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Kobayashi, T. (2004). Indications of Neutrino Oscillation in a 250 km Long-Baseline Experiment. In: Klapdor-Kleingrothaus, H.V. (eds) Beyond the Desert 2003. Springer Proceedings in Physics, vol 92. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-18534-2_20
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DOI: https://doi.org/10.1007/978-3-642-18534-2_20
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