Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10725170 | Physics Letters B | 2011 | 5 Pages |
Abstract
We report the first observation of the rare ηâe+eâe+eâ(γ) decay based on 1.7fbâ1 collected by the KLOE experiment at the DAΦNE Ï-factory. The selection of the e+eâe+eâ final state is fully inclusive of radiation. We have identified 362±29 events resulting in a branching ratio of (2.4±0.2stat+bckg±0.1syst)Ã10â5.
Keywords
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Nuclear and High Energy Physics
Authors
KLOE Collaboration KLOE Collaboration, F. Ambrosino, A. Antonelli, M. Antonelli, F. Archilli, I. Balwierz, G. Bencivenni, C. Bini, C. Bloise, S. Bocchetta, F. Bossi, P. Branchini, G. Capon, T. Capussela, F. Ceradini, P. Ciambrone, E. CzerwiÅski,