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Ultrahigh energy neutrinos, small x and unitarity
classification
✦ hep-ph
keywords
energyultrahighunitarityarguebreakdownconstraintscouplingcross
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The ultrahigh energy cross section for neutrino interactions with nucleons is reviewed, and unitarity constraints are discussed. We argue that existing QCD extrapolations are self-consistent, and do not imply a breakdown of the perturbative expansion in the weak coupling.
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