Hard Pomeron Enhanced Cascade Production and Flux Shadowing in HighEnergy Neutrino Astrophysics
Abstract
Various implications of new, nonperturbative pomeron inspired enhancement of smallx neutrinonucleon structure functions for highenergy 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 twocomponent model comprises hard and soft pomerons), to neutrinonucleon scattering case. We found that i) such enhancement causes the most rapid growth of neutrinonucleon crosssections 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 highenergy 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 powerlaw 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 smallx extrapolation of structure functions. Hard pomeron enhanced highenergy shadow factors are found to be many orders of magnitude lower than those obtained within ordinary perturbative QCD.
 Publication:

arXiv eprints
 Pub Date:
 January 2002
 arXiv:
 arXiv:astroph/0201528
 Bibcode:
 2002astro.ph..1528G
 Keywords:

 Astrophysics;
 High Energy Physics  Phenomenology
 EPrint:
 15 pages, 10 figures. Lecture on the Sixth International SchoolSeminar "Actual Problems of Particle Physics", (Gomel, Belarus, August 716, 2001)