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arXiv 2302.01943astro-ph.HEhep-ph
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银河系中γ射线产生截面的新测定

New determination of the production cross section for $γ$ rays in the Galaxy

Luca Orusa, Mattia Di Mauro, Fiorenza Donato, Michael Korsmeier

AI总结:

本文提出强子碰撞产生γ射线的新解析截面,纳入多种介子与重子道,并给出10 MeV至100 TeV微分截面及不确定度和公开数据工具。

摘要:

Fermi大天区望远镜以前所未有的精度测量了从100 MeV到接近1 TeV的γ射线通量。未来,切伦科夫望远镜阵列将具备测量能量高达100 TeV光子的能力。为准确解释这些数据,需要对产生过程作出精确预测,特别是宇宙线质子和氦与星际介质原子相互作用产生光子的截面。在本研究中,我们确定了新的解析函数,用于描述强子碰撞中γ射线产生的洛伦兹不变截面。我们利用π^0产生道有限的总截面数据,并借助此前对带电π介子产生的分析来推断缺失的细节,以补充这些信息。在此背景下,我们强调需要关于π^0产生的新数据。我们的预测包括所有贡献低至最终截面0.5%水平的产生道截面,即η、K^+、K^-、K^0_S和K^0_L介子以及Λ、Σ和Ξ重子。我们确定了从10 MeV到100 TeV的总微分截面dσ(p+p→γ+X)/dE_γ;在γ射线能量低于10 GeV时,其不确定度为10%,在TeV能量时增至20%。我们提供数值表格和脚本,以便学界获取我们的能量微分截面;这些截面给出的入射质子(原子核)能量范围为0.1至10^7 GeV(GeV/n)。

英文摘要:

The flux of $γ$ rays is measured with unprecedented accuracy by the $\textit{Fermi}$ Large Area Telescope from 100 MeV to almost 1 TeV. In the future, the Cherenkov Telescope Array will have the capability to measure photons up to 100 TeV. To accurately interpret this data, precise predictions of the production processes, specifically the cross section for the production of photons from the interaction of cosmic-ray protons and helium with atoms of the ISM, are necessary. In this study, we determine new analytical functions describing the Lorentz-invariant cross section for $γ$-ray production in hadronic collisions. We utilize the limited total cross section data for $π^0$ production channels and supplement this information by drawing on our previous analyses of charged pion production to infer missing details. In this context, we highlight the need for new data on $π^0$ production. Our predictions include the cross sections for all production channels that contribute down to the 0.5% level of the final cross section, namely $η$, $K^+$, $K^-$, $K^0_S$, and $K^0_L$ mesons as well as $Λ$, $Σ$, and $Ξ$ baryons. We determine the total differential cross section $dσ(p+p\rightarrow γ+X)/dE_γ$ from 10 MeV to 100 TeV with an uncertainty of 10% below 10 GeV of $γ$-ray energies, increasing to 20% at the TeV energies. We provide numerical tables and a script for the community to access our energy-differential cross sections, which are provided for incident proton (nuclei) energies from 0.1 to $10^7$ GeV (GeV/n).

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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