标题： 多GeV缪子在薄铅靶上的大角度散射 显示英文标题

标题： Large-angle scattering of multi-GeV muons on thin Lead targets

摘要： 多GeV缪子在薄（$t/X_0 \sim 10^{-1}$）铅靶中的大角度散射概率被研究。 这里提出的新的估计基于模拟程序（GEANT4库）和理论计算。 为了验证模拟结果，将其与文献中的实验数据进行了比较。 当应用于CNGS束中微中子的$\nu_\mu^{CC}$相互作用产生的缪子时，这项研究尤其相关。 在这种情况下，所研究的过程代表了在LNGS的OPERA实验中$\tau \to \mu$通道中$\nu_\mu \to \nu_\tau$搜索的主要背景。 最后，我们还在CNGS背景下，研究了缪子光核过程可能的贡献，这些贡献原则上也可能在探测器中产生大角度缪子散射特征。 显示英文摘要

摘要： The probability of large-angle scattering for multi-GeV muons in thin ($t/X_0 \sim 10^{-1}$) lead targets is studied. The new estimates presented here are based both on simulation programs (GEANT4 libraries) and theoretical calculations. In order to validate the results provided by simulation, a comparison is drawn with experimental data from the literature. This study is particularly relevant when applied to muons originating from $\nu_\mu^{CC}$ interactions of CNGS beam neutrinos. In that circumstance the process under study represents the main background for the $\nu_\mu \to \nu_\tau$ search in the $\tau \to \mu$ channel for the OPERA experiment at LNGS. Finally, we also investigate, in the CNGS context, possible contributions from the muon photo-nuclear process which might in principle also produce a large-angle muon scattering signature in the detector.