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    The Dispersive Approach to Electroweak Processes in the Background Magnetic Field

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    We propose a new method to compute amplitudes of electroweak processes in the strong background magnetic field, using γe+e\gamma\to e^+e^- as an example. We show that the {\it moments} of γe+e\gamma\to e^+e^- width are proportional to the derivatives of photon polarization function at the zero energy. Hence, the pair-production width can be easily calculated from the latter by the inverse Mellin transform. The prospects of our approach are commented.Comment: 3 pages, talk presented in DPF2000, Aug. 9-12, Ohio State
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