Abstract:
We give general arguments that no narrow quasi-bound e+ e- state can exist above 2me. We extend the virial theorem of QED to quasi-bound states and show that corrections due to renormalization and due to the fact that a resonance is not an energy eigenstate are small. A "magnetically bound" e+ e- state with energy above 2me would violate this extended virial theorem. © 1988.
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