Neutrino-photon reactions in astrophysics and cosmology

Abstract

At energies above the threshold for $W$ production the process $\nu \gamma \to l{W}^{+}$ is competive with $\nu \nu$ scattering at the same center of mass energies. In a cosmological setting, absorption of ultra high energy neutrinos by the microwave photon background is comparable to absorption by the neutrino background. In passing through matter, the process $\nu \to l{W}^{+}$ will occur in the coulomb field of nuclei. For iron, the interaction rate per nucleon is roughly 20% of the charge current cross-section. The related process, $\antiν_e e^- \to γW^-$ dominates $\antiν_e e^-$ scattering for about a decade in energy above the resonance for $W$ production.

4 pages, revtex, 6 eps figures, submitted to prl

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