Observation of the rare eta->e+e-e+e- decay with the KLOE experiment

preprint2011arXivOpen access

The 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. Czerwinski E. DeLucia A. DeSantis P. DeSimone G. DeZorzi A. Denig A. DiDomenico C. DiDonato B. DiMicco M. Dreucci G. Felici S. Fiore P. Franzini C. Gatti P. Gauzzi S. Giovannella E. Graziani M. Jacewicz J. Lee-Franzini M. Martemianov M. Martini P. Massarotti S. Meola S. Miscetti G. Morello M. Moulson S. Muller M. Napolitano F. Nguyen M. Palutan A. Passeri V. Patera I. PradoLonghi P. Santangelo B. Sciascia M. Silarski T. Spadaro C. Taccini L. Tortora G. Venanzoni R. Versaci G. Xu J. Zdebik as members of the KLOE-2 collaboration :D. Babusci D. Badoni V. Bocci A. Budano S. A. Bulychjev P. Campana E. Dane G. DeRobertis D. Domenici O. Erriquez G. Fanizzi F. Gonnella F. Happacher B. Hoistad E. Iarocci T. Johansson V. Kulikov A. Kupsc F. Loddo M. Matsyuk R. Messi D. Moricciani P. Moskal A. Ranieri I. Sarra M. Schioppa A. Sciubba W. Wislicki M. Wolke

hep-ex

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We report the first observation of the rare eta->e+e-e+e- decay based on 1.7 fb^{-1} collected by the KLOE experiment at the DAFNE phi-factory. The selection of the e+e-e+e- final state is fully inclusive of radiation. We have identified 362 +- 29 events resulting in a branching ratio of (2.4 +- 0.2_stat+bckg +- 0.1_syst) x 10^{-5}.

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Observation of the rare eta->e+e-e+e- decay with the KLOE experiment

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