Prompt neutrinos from atmospheric cc̄ and bb̄ production and the gluon at very small x

A. D. Martin, M. G. Ryskin, Anna Stasto

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Abstract

We improve the accuracy of the extrapolation of the gluon distribution of the proton to very small x, and show that the charm production cross section, needed to calculate the cosmic ray-induced 'atmospheric' flux of ultrahigh energy prompt νμ and ντ neutrinos, may be predicted within perturbative QCD to within about a factor of three. We follow the sequence of interactions and decays in order to calculate the neutrino fluxes as a function of energy up to 109 GeV. We also compute the prompt ντ flux from bb̄ production, hadronization and decay. New cosmic sources of neutrinos will be indicated if more prompt neutrinos are observed than predicted. If fewer neutrinos are observed than predicted, then constraints will be imposed on the nuclear composition of cosmic rays. The advantages of studying ντ neutrinos are emphasized. We provide a simple parametrization of the prediction for the inclusive cross section for c quark production in high energy proton-air collisions.

Original languageEnglish (US)
Pages (from-to)3273-3303
Number of pages31
JournalActa Physica Polonica B
Volume34
Issue number6
StatePublished - Jun 1 2003

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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