Sensitive search for resonances in low-energy e+e- scattering

A. L. Hallin, F. P. Calaprice, R. A. McPherson, E. R.J. Saettler

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We have searched for resonances in e+e- scattering in a range of positron kinetic energies from 1.9 to 2.5 MeV (1.75-1.88 MeV invariant energy). Such resonances would exist if the anomalous electron-positron pairs observed in heavy-ion collisions were due to two-body decay of a neutral object. Our 97% confidence limit excludes resonances with an energy-integrated cross section greater than 0.3 to 2.4 beV/sr, depending upon the incident positron energy. For scalar resonances, this corresponds to a lower limit on the lifetime that varies from 8 × 10-14 to 5 × 10-13 sec. These are the most sensitive limits to date.

Original languageEnglish (US)
Pages (from-to)3955-3960
Number of pages6
JournalPhysical Review D
Issue number11
StatePublished - Jan 1 1992

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Physics and Astronomy (miscellaneous)

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    Hallin, A. L., Calaprice, F. P., McPherson, R. A., & Saettler, E. R. J. (1992). Sensitive search for resonances in low-energy e+e- scattering. Physical Review D, 45(11), 3955-3960.