Photon splitting above the pair creation threshold in a strong magnetic field
M. V. Chistyakov, A. V. Kuznetsov, N. V. Mikheev
Abstract
The process of photon splitting γ γγ in a strong magnetic field is investigated both below and above the pair creation threshold. Contrary to the statement by Baier et al., the ``allowed'' channel is shown not to be a comprehensive description of splitting in the strong field because the ``forbidden'' channel is also essential. The partial amplitudes and the splitting probabilities are calculated taking account of the photon dispersion and large radiative corrections near the resonance.
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