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arXiv 1408.0288hep-phastro-ph.HE
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cosmic ray研究中反质子产生截面的新估算

A new evaluation of the antiproton production cross section for cosmic ray studies

Mattia di Mauro, Fiorenza Donato, Andreas Goudelis, Pasquale Dario Serpico

摘要:

目前对宇宙反质子光谱的理论预测达不到相应的实验精度。不确定性的主要来源之一是宇宙线非弹性相互作用中的反质子产生截面。我们分析了现有的数据反质子生产的$pp$散射,包括第一次由NA 49合作进行的测量。我们计算的反质子谱发现,在能量范围内的数据可用(反质子能量约4-550 GeV)不同的方法导致几乎相同的结果,与10- 20%的不确定性。在这个区域之外的外推导致不同的估计,不确定性达到$1$ TeV附近的50%水平,降低了这些能量下反质子通道的诊断能力。我们还评论的不确定性的反质子生产源项来自重于质子的核和中子产生的$pp$散射,并指出需要专门的实验活动的所有过程中涉及的反质子生产的轻核碰撞。

英文摘要:

Theoretical predictions for the cosmic antiproton spectrum currently fall short of the corresponding experimental level of accuracy. Among the main sources of uncertainty are the antiproton production cross sections in cosmic ray inelastic interactions. We analyse existing data on antiproton production in $pp$ scattering, including for the first time the measurements performed by the NA49 Collaboration. We compute the antiproton spectrum finding that in the energy range where data are available (antiproton energies of about 4-550 GeV) different approaches lead to almost equivalent results, with an uncertainty of 10-20\%. Extrapolations outside this region lead to different estimates, with the uncertainties reaching the 50\% level around $1$ TeV, degrading the diagnostic power of the antiproton channel at those energies. We also comment on the uncertainties in the antiproton production source term coming from nuclei heavier than protons and from neutrons produced in $pp$ scatterings, and point out the need for dedicated experimental campaigns for all processes involving antiproton production in collisions of light nuclei.

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