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arXiv 0910.3701hep-phastro-ph.HE
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核表面的胶子饱和效应:质子-核超高能Cosmic Ray区的非弹性截面

Gluon Saturation Effects at the Nuclear Surface: Inelastic Cross Section of Proton-Nucleus at Ultra High Energy Cosmic Ray domain

L. Portugal, T. Kodama

摘要:

考虑到核内QCD胶子分布的高能极限,我们用简化的偶极模型计算了质子-核总非弹性截面。我们表明,如果胶子饱和发生在核表面区域,质子-核碰撞的总截面增加更迅速地作为入射能量的函数相比,一个Glauber型的估计。我们讨论了这方面的影响,最近的超高能宇宙射线实验。

英文摘要:

Considering the high-energy limit of the QCD gluon distribution inside a nucleus, we calculate the proton-nucleus total inelastic cross section using a simplified dipole model. We show that, if gluon saturation occurs in the nuclear surface region, the total cross section of proton-nucleus collisions increases more rapidly as a function of the incident energy compared to that of a Glauber-type estimate. We discuss the implications of this with respect to recent ultra-high-energy cosmic ray experiments.

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