Search for ν_μ→ν_τ oscillation

在1994-1997年期间，CHORUS探测器的杀伤目标从CERN-SPS向宽带中性束提出。大约170，000个神经元的相互作用成功地位于沼泽地。在自动仿真扫描系统中的改进和不同标准的应用允许用于研究Charm生产的位置事件的示例。我们根据25，693个地点的Nyu、Mucharged和当前（CC）交互分析的Sofar的生产率的测量。在垂直区域的事件拓扑重建后，有283个D 0年观测到9.2 K 0和Λ年估计的背景。交叉比率·D 0生产和Nyu节·mu CC相互作用已被找到（l.99+·9.13（stat.）+·0.17（Syst.）^ 10·2 at 27 GeV average nyu·mu energy。

During the years 1994-1997,the emulsion target of the CHORUS detector was exposed to the wide band neutrino Beam from the CERN-SPS. About 170000 neutrino interactions were successfully located in the emulsion. Improvements in the automatic emulsion scanning systems and application of different criteria allowed the sample of located events to used for studies of charm production. We present a measurement of the production rate of D0 measons based on a sample of 25693 located nyu・mu charged・current(CC)interactions analyzed sofar. After reconstruction of the event topology in the vertex region,283 D0 decays were observed with an estimated background of 9.2K0 and Λ decays. The ratio of cross・section of D0 production and nyu・mu CC interactions is found to be(l.99+・9.13(stat.)+・0.17(syst.))^*10・2 at 27GeV average nyu・mu energy.