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Measurement of neutrino oscillation by the K2K experiment

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Measurement of neutrino oscillation by the K2K experiment

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K2K Collaboration; Ahn, M.H.; Burguet Castell, Jordi; Català Pérez, Joan; Cervera Villanueva, Anselmo; Gómez Cadenas, Juan José; Novella Garijo, Pau; Sorel, Michel; Vidal Sitjes, Gabriel; Tornero López, Ana María

Aquest document és un/a article, creat/da en: 2006

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(-8.6)(+9.2) events without oscillation. A distortion of the energy spectrum is also seen in 58 single-ring muonlike events with reconstructed energies. The probability that the observations are explained by the expectation for no neutrino oscillation is 0.0015% (4.3 sigma). In a two-flavor oscillation scenario, the allowed Delta m(2) region at sin(2)2 theta=1 is between 1.9 and 3.5x10(-3) eV(2) at the 90% C.L. with a best-fit value of 2.8x10(-3) eV(2).

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