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arXiv 0709.4461hep-ph
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超高能带电中微子截面和τ能损失

Charged Current Neutrino Cross Section and Tau Energy Loss at Ultra-High Energies

N. Armesto, C. Merino, G. Parente, E. Zas

摘要:

我们评估的τ轻子的能量损失产生的光核相互作用和中微子带电电流截面在超高能量,与中微子边界与地球掠过τ中微子,使用不同的理论和唯象模型的核子和核结构功能。理论上的不确定性估计采取不同的外推的结构函数F2非常低的值的x,在低和中等Q2范围内的τ轻子相互作用和高Q2的中微子-核非弹性截面。正是在这些极低的x值下,核遮蔽和部分子饱和效应是未知的,并且可能比通常认为的更强。当τ和中微子能量E=10^9 GeV时,我们发现τ能量损失的不确定度为4倍,带电中微子-核截面的不确定度为2倍。

英文摘要:

We evaluate both the tau lepton energy loss produced by photonuclear interactions and the neutrino charged current cross section at ultra-high energies, relevant to neutrino bounds with Earth-skimming tau neutrinos, using different theoretical and phenomenological models for nucleon and nucleus structure functions. The theoretical uncertainty is estimated by taking different extrapolations of the structure function F2 to very low values of x, in the low and moderate Q2 range for the tau lepton interaction and at high Q2 for the neutrino-nucleus inelastic cross section. It is at these extremely low values of x where nuclear shadowing and parton saturation effects are unknown and could be stronger than usually considered. For tau and neutrino energies E=10^9 GeV we find uncertainties of a factor 4 for the tau energy loss and of a factor 2 for the charged current neutrino-nucleus cross section.

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