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arXiv 0906.3726hep-phhep-ex
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地下μ子电荷比的解释

Interpretation of the Underground Muon Charge Ratio

P. A. Schreiner, J. Reichenbacher, M. C. Goodman

摘要:

MINOS实验观测到地下μ介子电荷比$r_μ$ = ${μ^+/μ^-}$的上升。该比率可与${π^+/π^-}$和${K^+/K^-}$的大气产生比率相关。我们的分析表明,研究的相关变量的电荷比+ $\ecos$,而不是$\emu$。我们比较了一个简单的能量依赖的参数化的电荷比的上升与更详细的先前发表的蒙特卡罗模拟和分析计算。我们还估计在这种情况下,以前被忽视的两个影响的大小:在岩石中的dE/dx的电荷符号依赖性,和重原色的能量依赖于派生的${K^+/K^-}$比。

英文摘要:

The MINOS experiment has observed a rise in the underground muon charge ratio $r_μ$ = ${μ^+/μ^-}$. This ratio can be related to the atmospheric production ratios of ${π^+/π^-}$ and ${K^+/K^-}$. Our analysis indicates that the relevant variable for studying the charge ratio+ $\ecos$, rather than $\emu$. We compare a simple energy dependent parameterization of the rise in the charge ratio with more detailed previously published Monte Carlo simulations and an analytical calculation. We also estimate the size of two previously neglected effects in this context: the charge sign dependency of the dE/dx in rock, and the energy dependence of heavy primaries on the derived ${K^+/K^-}$ ratio.

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