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Polarization-operator approach to electron-positron pair production in combined laser and Coulomb fields

MPG-Autoren
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Milstein,  Alexander I.
Prof. Dirk Schwalm, Emeriti, MPI for Nuclear Physics, Max Planck Society;

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Müller,  Carsten
Division Prof. Dr. Christoph H. Keitel, MPI for Nuclear Physics, Max Planck Society;

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Hatsagortsyan,  Karen Zaven
Division Prof. Dr. Christoph H. Keitel, MPI for Nuclear Physics, Max Planck Society;

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Jentschura,  Ulrich David
Division Prof. Dr. Christoph H. Keitel, MPI for Nuclear Physics, Max Planck Society;

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Keitel,  Christoph Helmut
Division Prof. Dr. Christoph H. Keitel, MPI for Nuclear Physics, Max Planck Society;

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Zitation

Milstein, A. I., Müller, C., Hatsagortsyan, K. Z., Jentschura, U. D., & Keitel, C. H. (2006). Polarization-operator approach to electron-positron pair production in combined laser and Coulomb fields. Physical Review A, 73(6): 062106. doi:10.1103/PhysRevA.73.062106.


Zitierlink: http://hdl.handle.net/11858/00-001M-0000-0011-7FDE-4
Zusammenfassung
The optical theorem is applied to the process of electron-positron pair creation in the superposition of a nuclear Coulomb and a strong laser field. We derive representations for the total production rate as twofold integrals, both for circular laser polarization and for the general case of elliptic polarization. Our approach allows us to obtain, by analytical means, the asymptotic behavior of the pair creation rate for various limits of interest. In particular, we consider pair production by two-photon absorption and show that, close to the energetic threshold of this process, the rate obeys a power law in the laser frequency with different exponents for linear and circular laser polarization. With the help of the upcoming x-ray laser sources, our results could be tested experimentally.