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Longitudinal spin polarization in multiphoton Bethe-Heitler pair production

MPS-Authors
http://pubman.mpdl.mpg.de/cone/persons/resource/persons30832

Müller,  Tim-Oliver
Division Prof. Dr. Christoph H. Keitel, MPI for Nuclear Physics, Max Planck Society;
Physik Department, Technische Universität München, D-85747 Garching, Germany;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons30828

Müller,  Carsten
Division Prof. Dr. Christoph H. Keitel, MPI for Nuclear Physics, Max Planck Society;
Institut für Theoretische Physik, Heinrich-Heine-Universität Düsseldorf, D-40225 Düsseldorf, Germany;

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Citation

Müller, T.-O., & Müller, C. (2012). Longitudinal spin polarization in multiphoton Bethe-Heitler pair production. Physical Review A, 86(2): 022109, pp. 1-10. doi:10.1103/PhysRevA.86.022109.


Cite as: http://hdl.handle.net/11858/00-001M-0000-000F-EA5B-0
Abstract
Helicity transfer in electron-positron pair production by a relativistic proton colliding with an intense laser beam of circular polarization is studied. The pairs are produced nonlinearly via absorption of few laser photons. Our approach relies on the laser-dressed description of the leptons by relativistic Volkov states and the spin-projection formalism. We calculate spin-resolved production rates, differential in the energy and emission angle of one of the created leptons. The degree of longitudinal polarization is shown to depend on the number of laser photons involved, even when the total energy and momentum absorbed from the laser field is kept constant.