Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
2006-06-15
Phys.Rev.D74:072003,2006
Physics
High Energy Physics
High Energy Physics - Experiment
40 pages, 48 figures
Scientific paper
10.1103/PhysRevD.74.072003
We present measurements of nu_mu disappearance in K2K, the KEK to Kamioka long-baseline neutrino oscillation experiment. One hundred and twelve beam-originated neutrino events are observed in the fiducial volume of Super-Kamiokande with an expectation of 158.1^{+9.2}_{-8.6} events without oscillation. A distortion of the energy spectrum is also seen in 58 single-ring muon-like events with reconstructed energies. The probability that the observations are explained by the expectation for no neutrino oscillation is 0.0015% (4.3sigma). In a two flavor oscillation scenario, the allowed Delta m^2 region at sin^2(2theta) is between 1.9 and 3.5 x 10^{-3} eV^2 at the 90% C.L. with a best-fit value of 2.8 x 10^{-3} eV^2.
Ahn Myoung-Hwan
K2K Collaboration
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