Low-energy neutrino-photon inelastic interactions

Abstract

The computation of the polarized amplitudes and cross section of the processes $\gamma \nu \to \gamma \gamma \nu$, $\gamma \gamma \to \gamma \nu \bar{\nu }$ and $\nu \bar{\nu }\to \gamma \gamma \gamma$ is described. We used an effective lagrangian approach for energies below the threshold for $e^{+}{e}^{-}$ pair production and the complete computation at higher energies for application in supernova dynamics. Leading contributions of physics beyond the SM are also commented.

9 pages, Revtex, epsfig, axodraw. Talk given at 34th Rencontres de Moriond: Electroweak Interactions and Unified Theories, Les Arcs, France, 13-20 Mar 1999