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arXiv 0705.3815hep-ex
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用MINOS测量TeV能区大气μ子荷电比

Measurement of the Atmospheric Muon Charge Ratio at TeV Energies with MINOS

MINOS Collaboration

备注：
16 pages, 17 figures
发表信息：
Phys.Rev.D76:052003,2007
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摘要：

自2003年8月初以来，美国明尼苏达州苏丹地下实验室的5.4千吨MINOS远探测器一直在2070米水当量的深度采集电荷分离宇宙线μ子数据。结合正向和反向磁场运行配置的数据，以最大限度地减少地下μ子电荷比测定中的系统误差。当平均时，两个独立的分析发现地下的电荷比为1.374 +/- 0.004（统计）。+0.012 -0.010（系统）。利用苏丹岩石覆盖层的地图，在地下测量的μ介子动量被投影到能量范围为1-7 TeV的地表相应值。在这个范围内的能量在表面上，MINOS的数据是一致的电荷比是能量独立的两个标准偏差水平。当MINOS的结果与较低能量下的测量结果进行比较时，在0.3 - 1.0 TeV的能量范围内电荷比明显上升。定性模型表明，这种上升与kaon衰变对μ子电荷比的贡献增加一致。

英文摘要：

The 5.4 kton MINOS far detector has been taking charge-separated cosmic ray muon data since the beginning of August, 2003 at a depth of 2070 meters-water-equivalent in the Soudan Underground Laboratory, Minnesota, USA. The data with both forward and reversed magnetic field running configurations were combined to minimize systematic errors in the determination of the underground muon charge ratio. When averaged, two independent analyses find the charge ratio underground to be 1.374 +/- 0.004 (stat.) +0.012 -0.010(sys.). Using the map of the Soudan rock overburden, the muon momenta as measured underground were projected to the corresponding values at the surface in the energy range 1-7 TeV. Within this range of energies at the surface, the MINOS data are consistent with the charge ratio being energy independent at the two standard deviation level. When the MINOS results are compared with measurements at lower energies, a clear rise in the charge ratio in the energy range 0.3 -- 1.0 TeV is apparent. A qualitative model shows that the rise is consistent with an increasing contribution of kaon decays to the muon charge ratio.

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