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arXiv 2011.12769astro-ph.HEhep-ph
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产生高能天体物理中微子的质子能量

On the energy of the protons producing the very high-energy astrophysical neutrinos

Esteban Roulet, Francesco Vissani

摘要:

我们研究的能量分布的质子,可以产生一个天体物理中微子与给定的观察到的能量,在TeV-PeV范围内,无论是通过$pp$或$pγ$相互作用。由于在高质心能量下π介子产生的多重性增加,因此产生的平均质子能量可能比通常使用的近似值$E_p\simeq 20E_ν$大得多。此外,$pγ$过程的阈值可以导致$\langle E_p\rangle /E_ν$值的显著增加,从而降低中微子能量。结果敏感地依赖于假设的质子光谱,因为陡峭的光谱给较低能量的中微子尾的权重较小,这些中微子尾是由大量的低能π介子衰变产生的。在$pγ$方案中,它们还敏感地依赖于目标光子的光谱。这些结果对于将中微子光谱的可能特性与产生它们的相应宇宙射线的特性联系起来特别重要。我们还讨论了相关的生产的伽马射线的来源。

英文摘要:

We study the distribution of the energy of the protons that can produce an astrophysical neutrino with a given observed energy, in the TeV--PeV range, both through $pp$ or $pγ$ interactions. Due to the increasing multiplicity of the pion production at high center of mass energies, the resulting average proton energies can be much larger than the often used approximate value $E_p\simeq 20E_ν$. Also the threshold of the $pγ$ process can lead to a pronounced increase in the values of $\langle E_p\rangle /E_ν$ for decreasing neutrino energies. The results depend sensitively on the assumed proton spectrum, since steeper spectra give less weight to the lower energy neutrino tail resulting from the decays of the abundant low-energy pions. In the $pγ$ scenarios they also depend sensitively on the spectrum of the target photons. The results are in particular relevant to relate possible characteristics of the neutrino spectrum to those of the corresponding cosmic rays that generated them. We also discuss the associated production of gamma rays at the sources.

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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