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Limits for two-photon ande + e − decay widths of positron-electron scattering resonances for√s=1.78 to 1.92 MeV

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Zeitschrift für Physik A Hadrons and Nuclei

Abstract

Motivated by the observation of energy- and momentum-correlatede + e − pairs in heavy ion collisions, a search for resonances ine + e − scattering at the corresponding energies has been made. Thee + e − decay channel is analyzed in a time window from ∼ 10−13 s to ∼ 10−11 s with a set-up optimized for low-background detection of delayede + e − decays. The two-photon decay channel of a hypothetical resonance is investigated by measuring the two-photon annihilation-in-flight excitation function. New upper limits for the partiale + e − decay width Γee of a few meV are derived for total centre-of-mass energies √s between 1.78 and 1.92 MeV, taking into account the dilepton as well as the two-photon decay of a neutral resonance.

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Authors and Affiliations

  1. Institut für Theoretische und Angewandte Physik, Universität Stuttgart, Pfaffenwaldring 57, W-7000, Stuttgart 80, Federal Republic of Germany

    E. Widmann, W. Bauer, J. Major & A. Seeger

  2. Institut für Physik, Max-Planck-Institut für Metallforschung, Heisenbergstrasse 1, W-7000, Stuttgart 80, Federal Republic of Germany

    S. Connell, K. Maier, A. Seeger & H. Stoll

  3. Gesellschaft für Schwerionenforschung, Planckstrasse 1, W-6100, Darmstadt 11, Federal Republic of Germany

    F. Bosch

Authors
  1. E. Widmann
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  2. W. Bauer
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  3. S. Connell
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  4. K. Maier
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  5. J. Major
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  6. A. Seeger
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  7. H. Stoll
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  8. F. Bosch
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Dedicated to P. Armbruster on the occasion of his 60th birthday

We are grateful to the staff of the Stuttgart Pelletron accelerator, headed by W. Decker, for their excellent co-operation. We are very much indebted to Dr. U. Moser, University of Bern and Paul Scherrer Institut, Villigen, for making available the BGO crystals.

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Widmann, E., Bauer, W., Connell, S. et al. Limits for two-photon ande + e − decay widths of positron-electron scattering resonances for√s=1.78 to 1.92 MeV. Z. Physik A - Hadrons and Nuclei 340, 209–218 (1991). https://doi.org/10.1007/BF01303834

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  • DOI: https://doi.org/10.1007/BF01303834

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