arXiv 1902.112712019-02-28hep-phastro-ph.HE

超高能粒子物理

Particle Physics at Ultrahigh Energies

Glennys R. Farrar

备注：: This paper was prepared for the ISVHECRI 2014 proceedings, but never posted to the arXiv through an oversight. A few relevant subsequent citations have been added

摘要：

我们探索粒子物理超越加速器的能量，在天体物理观测中暴露的问题的动机：1）是否有合理的修改LHC调谐强子相互作用模型的标准外推，使高能宇宙线（UHECR）阵雨是很好地描述了一个纯粹的质子的主要组成，而不是需要一个调谐，能量依赖的组成混合物在传统的模型？2)对标准模型进行哪些修改可以解决混合UHECR观测中发现的预测地面信号的不足？我们发现，一个纯质子的组成提供了一个很好的适合淋浴的观察，如果QCD非弹性截面增加更迅速地高于$E_{\rm cm} \approx 60$ TeV比在传统的模型，并推测可能的原因，这可能会发生的“μ子不足”可以治愈相对较小的修改，以粒子比在未经探索的运动学制度低于和高于LHC的能量。

英文摘要：

We explore particle physics beyond accelerator energies, motivated by questions exposed in astroparticle physics observations: 1) Are there reasonable modifications to the standard extrapolations of LHC-tuned hadronic interaction models, so that ultrahigh energy cosmic ray (UHECR) showers are well-described with a purely protonic primary composition rather than requiring a tuned, energy-dependent composition mixture as needed in conventional models? 2) What modifications to standard models can solve the deficiency in the predicted ground signal found in hybrid UHECR observations? We find that a pure proton composition provides an excellent fit to shower observations, if the QCD inelastic cross section increases more rapidly above $E_{\rm cm} \approx 60$ TeV than in conventional models, and speculate as to possible reasons this may happen; the "muon deficiency" can be cured by relatively minor modifications to particle ratios in unexplored kinematic regimes below and above LHC energies.

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