Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1998-08-11
Nucl.Phys. B543 (1999) 255-268
Physics
High Energy Physics
High Energy Physics - Phenomenology
19 pages, 3 Postscript figures, uses axodraw.sty
Scientific paper
10.1016/S0550-3213(98)00790-1
In this paper, we compute the Standard Model polarized amplitudes and cross sections of the processes $\gamma\nu\to\gamma\gamma \nu$, $\gamma\gamma \to \gamma\nu\bar\nu$ and $\nu\bar\nu \to \gamma\gamma\gamma$, for centre-of-mass energies $\omega$ 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 ($\omega < m_e$) formula for $\gamma\nu\to\gamma\gamma \nu$. Finally, we discuss possible astrophysical implications of our results and provide simple fits to the exact expressions.
Abada Abdellatif
Matias Joaquim
Pittau Roberto
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