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Department of Physics, Kyoto University, Kyoto 606-8502, Japan.
Phys Rev Lett. 2005 Dec 16;95(25):252301. doi: 10.1103/PhysRevLett.95.252301. Epub 2005 Dec 12.
We report the result from a search for charged-current coherent pion production induced by muon neutrinos with a mean energy of 1.3 GeV. The data are collected with a fully active scintillator detector in the K2K long-baseline neutrino oscillation experiment. No evidence for coherent pion production is observed, and an upper limit of is set on the cross section ratio of coherent pion production to the total charged-current interaction at 90% confidence level. This is the first experimental limit for coherent charged pion production in the energy region of a few GeV.
我们报告了对平均能量为1.3 GeV的μ子中微子诱发的带电流相干π介子产生进行搜索的结果。数据是在K2K长基线中微子振荡实验中使用全活性闪烁体探测器收集的。未观察到相干π介子产生的证据，并在90%置信水平下对相干π介子产生与总带电流相互作用的截面比设定了上限。这是在几GeV能量区域内相干带电π介子产生的首个实验限制。
