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arXiv 0907.1412hep-phastro-ph.HE
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高能大气轻子通量

Atmospheric lepton fluxes at ultrahigh energies

J. I. Illana, M. Masip, D. Meloni

摘要:

为了估计在中微子望远镜中观测奇异物理的可能性,首先必须了解大气中微子、μ子和双μ子的通量。我们研究高能宇宙射线产生这些轻子。我们确定了能量E > 10^6 GeV的μ子的三个主要来源:粲介子和底介子的弱衰变和无味介子的电磁衰变。与标准假设相反,我们发现,η介子,而不是粲强子的迅速衰变,是在这些能量的大气μ介子的主要来源。我们表明,作为一个结果,中微子和μ子通量之间的比例显着减少。对于双μ子(它可能是中微子望远镜附近产生的长寿命态的背景),我们发现形成大于10^-6 rad的角的E ~ 10^7 GeV的介子对是通过D(80%)或B(10%)介子衰变和Drell-Yan过程(10%)产生的。所有这些过程的频率已使用喷气代码PYTHIA进行了评估。

英文摘要:

In order to estimate the possibility to observe exotic physics in a neutrino telescope, it is essential to first understand the flux of atmospheric neutrinos, muons and dimuons. We study the production of these leptons by high-energy cosmic rays. We identify three main sources of muons of energy E > 10^6 GeV: the weak decay of charm and bottom mesons and the electromagnetic decay of unflavored mesons. Contrary to the standard assumption, we find that eta mesons, not the prompt decay of charm hadrons, are the dominant source of atmospheric muons at these energies. We show that, as a consequence, the ratio between the neutrino and muon fluxes is significantly reduced. For dimuons, which may be a background for long-lived staus produced near a neutrino telescope, we find that pairs of E ~ 10^7 GeV forming an angle above 10^-6 rad are produced through D (80%) or B (10%) meson decay and through Drell-Yan proceses (10%). The frequency of all these processes has been evaluated using the jet code PYTHIA.

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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