Measurement of neutrino oscillation by the K2K experiment
Measurement of neutrino oscillation by the K2K experiment
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DOI：
10.1103/physrevd.74.072003
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发表时间：
2006-10-01
影响因子：
5
通讯作者：
Zalipska, J.
中科院分区：
文献类型：
--
作者：
Ahn, M. H.;Aliu, E.;Zalipska, J.
我们目前的测量nu（mu）消失在K2 K，KEK神冈长基线中微子振荡实验。在Super-Kamiokande的基准体积中观测到了112个束源中微子事件，预期为158.1（-8.6）（+9.2）个事件，没有振荡。在58个具有重建能量的单环类μ子事件中也可以看到能谱的失真。观测结果被解释为没有中微子振荡的可能性是0.0015%（4.3 sigma）。在双味振荡的情况下，在sin（2）2 θ =1时，允许的Delta m（2）区域在90% C. L.处介于1.9和3.5x10（-3）eV（2）之间。最佳拟合值为2.8x10（-3）eV（2）。
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).