Photoproduction of Wide-Angle Electron-Positron Pairs at High Energies

J. G. Asbury; William K. Bertram; U. Becker; P. Joos; M. Rohde; A. J. S. Smith; S. Friedlander; C. L. Jordan; Samuel C. C. Ting

doi:10.1103/PhysRev.161.1344

Photoproduction of Wide-Angle Electron-Positron Pairs at High Energies

J. G. Asbury, William K. Bertram, U. Becker, P. Joos, M. Rohde, A. J. S. Smith, S. Friedlander, C. L. Jordan, and Samuel C. C. Ting

Phys. Rev. 161, 1344 – Published 25 September 1967

Abstract

Using the DESY 6.2-GeV electron synchrotron, we have measured the photoproduction on carbon of electron-positron pairs, for a range in the invariant pair mass of 150-550 MeV. To detect the pairs and to discriminate against the intense pion background, a magnetic spectrometer, counters, and fast electronics were used. The results are in agreement with the predictions of first-order quantum electrodynamics, in contradiction with earlier experiments. A comparison of our results with other tests of quantum electrodynamics at small distances is discussed.

Received 2 February 1967

DOI:https://doi.org/10.1103/PhysRev.161.1344

Authors & Affiliations

J. G. Asbury^*, William K. Bertram^*, U. Becker, P. Joos, M. Rohde, and A. J. S. Smith^*

Deutsches Elektronen-Synchrotron DESY, Hamburg, Germany

S. Friedlander, C. L. Jordan, and Samuel C. C. Ting^†

Department of Physics, Columbia University, New York, New York

^*Volkswagen Foundation Fellow at DESY.
^†This work, a DESY-Columbia collaboration, was supported in part by the U. S. Atomic Energy Commission.

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Vol. 161, Iss. 5 — September 1967

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