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We study the neutrino-photon processes such as γγ → ν ¯ ν and νγ → νγ in a background magnetic field smaller than the critical magnetic field B c ≡ m 2 e /e. Using Schwinger's proper-time method, we extract leading magnetic-field contributions to the above processes. Our result is valid throughout the kinematic regime where both neutrino and photon energies(More)
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