Dynamical QCD Predictions for Ultrahigh Energy Neutrino Cross Sections
Abstract
Neutrino-nucleon total cross sections for neutrino energies up to ultrahigh energies (UHE), E=1012 GeV, are evaluated within the framework of the dynamical (radiative) parton model. The expected uncertainties of these predictions do not exceed the level of about 20 % at the highest energies where contributions of parton distributions in the yet unmeasured region around x 10-8 to 10-9 are non-negligible. This is far more accurate than estimated uncertainties of about 2+-1 due to ad hoc extrapolations of parton distributions to x<10-5 required for calculating UHE cosmic neutrino event rates.
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