论文标题
恢复延伸空气阵雨中的哑光密度的方位角对称性
Restoration of azimuthal symmetry of muon densities in extended air showers
论文作者
论文摘要
在地面上，倾斜的广泛阵雨（EAS）中MUON的方位角分布是不对称的，这主要是由于几何影响。在将二级颗粒的密度从地面到淋浴平面（垂直于淋浴轴）映射到二级颗粒的密度后，构建了对主要颗粒质量敏感的几个EAS。哑光的简单正交投影会在淋浴平面中坐在该平面上的方位角对称性。使用Corsika模拟，我们通过将每个MUON在其传入方向上投射到正常平面上，以纠正这种失真，同时还要考虑到衰减概率。我们表明，除了恢复淋浴轴周围的MUON密度的方位角对称性外，该过程的应用还对MUON生产深度的分布的重建以及其最大值的重建具有重大影响，即$ x _ {\ rm max}^μ$，这是对主要粒子质量敏感的。我们的结果定性地表明，不将其包括在$ x _ {\ rm max}^μ$的重建过程中，可能会引入偏差，从而通过根据Monte Carlo模拟分析实际数据而获得的结果。
At ground level, the azimuthal distribution of muons in inclined Extensive Air Showers (EAS) is asymmetric, mainly due to geometric effects. Several EAS observables sensitive to the primary particle mass, are constructed after mapping the density of secondary particles from the ground plane to the shower plane (perpendicular to the shower axis). A simple orthogonal projection of the muon coordinates onto this plane distorts the azimuthal symmetry in the shower plane. Using CORSIKA simulations, we correct for this distortion by projecting each muon onto the normal plane following its incoming direction, taking also into account the attenuation probability. We show that besides restoring the azimuthal symmetry of muons density around the shower axis, the application of this procedure has a significant impact on the reconstruction of the distribution of the muon production depth and of its maximum, $X_{\rm max}^μ$, which is an EAS observable sensitive to the primary particle mass. Our results qualitatively suggest that not including it in the reconstruction process of $X_{\rm max}^μ$ may introduce a bias in the results obtained by analyzing the actual data on the basis of Monte Carlo simulations.
