MINOS成果、进展和未来展望
MINOS Results, Progress and Future Prospects
摘要：
MINOS长基线实验自2005年3月以来一直在收集中微子束数据，迄今为止已积累了3 x 10^{20}个质子靶（POT）。MINOS使用费米实验室的NuMI中微子束，由两个钢闪烁体跟踪量热计测量，一个在费米实验室，另一个在明尼苏达州北部下游735公里处。通过观测中微子能谱中的振荡结构，MINOS可以精确测量大气扇区中的中微子振荡参数。根据对第一年数据的分析，对应于1.27 x 10^{20} POT，这些参数被确定为|Δm^2_{32}|=2.74^{+0.44}_{-0.26} × 10^{-3} eV^2，sin^2（2θ_{23}）>0.87（68% C.L.）。MINOS能够通过比较中微子束在其两个探测器中的到达时间来测量中微子速度。使用总共473个远探测器事件，（v-c）/c =（5.1 +/- 2.9）x 10^{-5}（68% C.L.）被测量。此外，我们报告了最近的进展，在中性电流事件的分析，并给出了未来的实验目标的大纲。
英文摘要：
The MINOS long baseline experiment has been collecting neutrino beam data since March 2005 and has accumulated 3 x 10^{20} protons-on-target (POT) to date. MINOS uses Fermilab's NuMI neutrino beam which is measured by two steel-scintillator tracking calorimeters, one at Fermilab and the other 735 km downstream, in northern Minnesota. By observing the oscillatory structure in the neutrino energy spectrum, MINOS can precisely measure the neutrino oscillation parameters in the atmospheric sector. From analysis of the first year of data, corresponding to 1.27 x 10^{20} POT, these parameters were determined to be |Δm^2_{32}|=2.74^{+0.44}_{-0.26} x 10^{-3} eV^2 and sin^2(2θ_{23})>0.87 (68% C.L.). MINOS is able to measure the neutrino velocity by comparing the arrival times of the neutrino beam in its two detectors. Using a total of 473 Far Detector events, (v-c)/c = (5.1 +/- 2.9) x 10^{-5} (68% C.L.) was measured. In addition, we report recent progress in the analysis of neutral current events and give an outline of experimental goals for the future.
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