1998/08/11 by A. Abada, Joaquim Matias, J. Matias +1 · 1 citation
Physics and Astronomy · #Astrophysics and Cosmic Phenomena #Neutrino Physics Research #Particle physics theoretical and experimental studies #astro-ph #hep-ph
paper · pdf · doi:10.1016/s0550-3213(98)00790-1
published as Nucl.Phys. B543 (1999) 255-268 · 19 pages, 3 Postscript figures, uses axodraw.sty
arxiv created 1998/08/11 · openalex publication_date 1999/03/01 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
In this paper, we compute the Standard Model polarized amplitudes and cross sections of the processes γν→γγν, γγ→ γνν and νν→ γγγ, for centre-of-mass energies ω within the range of validity of the Fermi theory. By using a large electron-mass expansion of the exact result, we also derive the first correction term to the effective, low-energy (ω< me) formula for γν→γγν. Finally, we discuss possible astrophysical implications of our results and provide simple fits to the exact expressions.