Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1999-05-18
Physics
High Energy Physics
High Energy Physics - Phenomenology
9 pages, Revtex, epsfig, axodraw. Talk given at 34th Rencontres de Moriond: Electroweak Interactions and Unified Theories, Les
Scientific paper
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.
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