K2K Experiment (English)

In: AIP Conference Proceedings   ;  689 ,  1  ;  35-52  ;  2003

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The K2K, the KEK to Kamioka long baseline neutrino oscillation experiment, observes evidences of neutrino oscillation: a reduction of muon neutrinos together with a distortion of the energy spectrum. Fifty six beam‐originated neutrino events are observed in Super‐Kamiokande with an expectation of 80.1 −5.4 +6.2 events. Among those events, twenty‐nine single‐ring muon‐like events are used to reconstruct the neutrino energy. The measured energy spectrum better matches with the expected one with oscillation. The probability of no oscillation is calculated to be less than 1 %. In a two flavor oscillation scenario, the allowed Δm2 region at sin22θ = 1 is between 1.5 and 3.9 × 10−3 eV2 at the 90 % C.L. The result at K2K is consistent with the oscillation of atmospheric neutrinos reported by Super‐Kamiokande collaboration.

Table of contents – Volume 689, Issue 1

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3
The Radio Ice Cherenkov Experiment
Adams, J. / Baird, A. / Bean, A. / Besson, D. / Byleen‐Higley, K. / Chambers, S. / Drees, J. / Graham, S. / Harris, P. / Kravchenko, I. et al. | 2003
16
Sudbury Neutrino Observatory
Klein, Joshua R. | 2003
32
The Status of the Booster Neutrino Experiment at Fermilab (MiniBooNE)
Mills, Geoffrey B. | 2003
35
K2K Experiment
Nakaya, T. | 2003
53
Neutrino Physics Without Oscillations
Thomas, Anthony W. | 2003
63
Neutrinos under Strong Magnetic Fields
Ferrer, Efrain J. / de la Incera, Vivian | 2003
74
Some Remarks on Neutrino Oscillation and Masses
Zee, A. | 2003
85
Semileptonic and Rare B Decays at B Factories
Emery, Sandrine | 2003
113
Search for New States of Matter with the STAR Experiment at RHIC
Lange, Jens Sören | 2003
126
QCD Factorization in B Decays into ρπ
Guo, X.‐H. / Leitner, O. M. A. / Thomas, A. W. | 2003
137
CP Violation, Dark Matter and Extra Dimensions in the D‐Zero Experiment at the Tevatron
Ratoff, Peter Neil | 2003
150
B Physics (Theory)
Rosner, Jonathan L. | 2003
175
Dark Matter Detection
Caldwell, David O. | 2003
184
Coherent Phase Argument for Inflation
Dodelson, Scott | 2003
197
Dark Energy Present and Future
Frampton, Paul H. | 2003