High energy photon-neutrino interactions

Abstract

A general decomposition of the amplitudes for the $2\to 2$ processes $\gamma \nu \to \gamma \nu$ and $\gamma \gamma \to \nu \bar{\nu }$ is obtained using gauge invariance and Bose symmetry. The restrictions implied by this decomposition are investigated for the reaction $\gamma \gamma \to \nu \bar{\nu }$ by computing the one-loop helicity amplitudes in the standard model. In the center of mass, where $\sqrt{s}=2\omega$, the cross section grows roughly as ${\omega }^6$ up to the threshold for $W$-boson production, $\sqrt{s}=2m_W$. Astrophysical implications of very high energy photon-neutrino interactions are discussed.

11 pages LaTeX, 4 postscript figures included

References in corpus (1)

• Photon-neutrino interactions

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