First observation and cross-section measurement of e+e-e+e-

R. C. Allen, V. Bharadwaj, G. A. Brooks, H. H. Chen, P. J. Doe, R. Hausammann, W. P. Lee, H. J. Mahler, M. E. Potter, A. M. Rushton, K. C. Wang, T. J. Bowles, R. L. Burman, R. D. Carlini, D. R.F. Cochran, J. S. Frank, E. Piasetzky, V. D. Sandberg, D. A. Krakauer, R. L. Talaga

Research output: Contribution to journalArticlepeer-review


We report the first observation and cross-section measurement of e+e-e+e-. Using neutrinos of energy less than 53 MeV, we observed 6317 events consistent with +e-+e-, of which 5117 events are assigned to e+e-e+e-. The resulting cross section, {[8.93.2(statistical) 1.5(systematic)]×10-45 cm2/MeV} E, agrees with standard electroweak theory, rules out constructive interference between weak charged-current and neutral-current interactions, and begins to indicate the existence of interference between these two interactions.

Original languageEnglish
Pages (from-to)2401-2404
Number of pages4
JournalPhysical Review Letters
Issue number22
StatePublished - 1985


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