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arXiv 0909.0055astro-ph.HE
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IceCube中高pT μ子的研究

Study of High pT Muons in IceCube

Lisa Gerhardt, Spencer Klein

摘要:

在宇宙线空气簇射中,通过重夸克的半轻子衰变和高pT的K介子和π介子的衰变,产生了具有高横动量(pT)的μ子。这些高p_T μ子与簇射芯μ子束有很大的横向间距。IceCube非常适合于高p_T μ子的探测。表面簇射阵可以确定宇宙线空气簇射的能量、核心位置和方向,而冰内簇射阵可以重建高p_T μ子的能量和方向。这使得可以在大于150米的距离处测量退相干函数(横向分离光谱)。μ子p_T可以从μ子能量(通过dE/dx测量)和横向间隔来确定。高p_T μ子谱也可以在微扰QCD框架下计算,该谱对宇宙线成分敏感。

英文摘要:

Muons with a high transverse momentum (p_T) are produced in cosmic ray air showers via semileptonic decay of heavy quarks and the decay of high p_T kaons and pions. These high p_T muons have a large lateral separation from the shower core muon bundle. IceCube is well suited for the detection of high p_T muons. The surface shower array can determine the energy, core location and direction of the cosmic ray air shower while the in-ice array can reconstruct the energy and direction of the high p_T muon. This makes it possible to measure the decoherence function (lateral separation spectrum) at distances greater than 150 meters. The muon p_T can be determined from the muon energy (measured by dE/dx) and the lateral separation. The high p_T muon spectrum may also be calculated in a perturbative QCD framework; this spectrum is sensitive to the cosmic-ray composition.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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