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28 March 2024
 
  » arxiv » hep-ex/9810007

 Article overview


First Observation of the Rare Decay Mode K-long -> e+ e-
BNL E871 Collaboration: D. Ambrose ; C. Arroyo ; M. Bachman ; P. de Cecco ; D. Connor ; M. Eckhause ; K. M. Ecklund ; S. Graessle ; A. D. Hancock ; K. Hartman ; M. Hebert ; C. H. Hoff ; G. W. Hoffmann ; G. M. Irwin ; J. R. Kane ; N. Kanematsu ; Y. Kuang ; K. Lang ; R. Lee ; R. D. Martin ; J. McDonough ; A. Milder ; W. R. Molzon ; M. Pommot-Maia ; P. J. Riley ; J. L. Ritchie ; P. D. Rubin ; V. I. Vassilakopoulos ; C. B. Ware ; R. E. Welsh ; S. G. Wojcicki ; E. Wolin ; S. Worm ;
Date 1 Oct 1998
Journal Phys.Rev.Lett. 81 (1998) 4309-4312
Subject hep-ex
AbstractIn an experiment designed to search for and study very rare two-body decay modes of the K-long, we have observed four examples of the decay K-long -> e+ e-, where the expected background is 0.17+-0.10 events. This observation translates into a branching fraction of 8.7^{+5.7}_{-4.1} X 10^{-12}, consistent with recent theoretical predictions. This result represents by far the smallest branching fraction yet measured in particle physics.
Source arXiv, hep-ex/9810007
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