1998/10/01 by BNL E871 Collaboration, David A. Ambrose, D. Ambrose +40 · 1 citation
Physics and Astronomy · #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ex
paper · pdf · doi:10.1103/physrevlett.81.4309
published as Phys.Rev.Lett.81:4309-4312,1998 · 9 pages, 3 figures
arxiv created 1998/10/01 · openalex publication_date 1998/11/16 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
In an experiment designed to search for and study very rare two-body decay modes of the KL0, we have observed four examples of the decay KL0\ensuremath→e+e^\ensuremath-, where the expected background is 0.17\ifmmode±\else\textpm\fi0.10 events. This observation translates into a branching fraction of 8.7_\ensuremath-4.1+5.7\ifmmode×\else\texttimes\fi10^\ensuremath-12, consistent with recent theoretical predictions. This result represents by far the smallest branching fraction yet measured in particle physics.