标题： 高能中微子天体物理学中的硬庞顿增强级联产生和通量遮蔽效应 显示英文标题

标题： Hard Pomeron Enhanced Cascade Production and Flux Shadowing in High-Energy Neutrino Astrophysics

摘要： 新提出的非微扰的Pomeron启发的小-x中微子-核子结构函数增强对高能中微子天体物理学的各种影响被讨论了。在x大于10^{-5}时，这些函数由微扰QCD给出，而在较低的x时，它们由A. Donnachie和P.V. Landshoff（他们的两组分模型包括硬Pomeron和软Pomeron）提出的F_2^{ep}(x,Q^2)描述的具体推广来确定，适用于中微子-核子散射情况。我们发现i）这种增强导致高能下中微子-核子截面的最快速增长，ii）Pomeron效应可能在未来的巨型探测器中中微子诱导事件的速率中被察觉，iii）高能中微子通量在通过大柱深物质时由于吸收（CC+NC）和再生（NC）引起的演化速率可能受到硬Pomeron的额外影响。求解初始幂律下降的中微子谱的输运方程，我们评估了几种柱深和谱指数的阴影因子。结果与在结构函数平凡的小-x外推下进行的类似计算进行了比较。发现硬Pomeron增强的高能阴影因子比普通微扰QCD得到的要低许多数量级。 显示英文摘要

摘要： Various implications of new, non-perturbative pomeron inspired enhancement of small-x neutrino-nucleon structure functions for high-energy neutrino astrophysics are discussed. At x larger than 10^{-5} these functions are given by perturbative QCD, while at lower x they are determined by a specific generalization of F_2^{ep}(x,Q^2) description, proposed by A. Donnachie and P. V. Landshoff (their two-component model comprises hard and soft pomerons), to neutrino-nucleon scattering case. We found that i) such enhancement causes the most rapid growth of neutrino-nucleon cross-sections at high energies, ii) pomeron effects may be perceptible in the rates of neutrino induced events in future giant detectors and iii) the rate of high-energy neutrino flux evolution (due to absorption (CC+NC) and regeneration (NC)) on its pass through a large column depth of matter may be subjected to additional influence of hard pomeron. Solving transport equations for the initially power-law decreasing neutrino spectra, we have evaluated shadow factors for several column depths and spectrum indices. The results are compared with analogous calculations, performed within a trivial small-x extrapolation of structure functions. Hard pomeron enhanced high-energy shadow factors are found to be many orders of magnitude lower than those obtained within ordinary perturbative QCD.