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

A.Antonelli; A.Budano; A.Denig; A.DeSantis; A.DiDomenico; A.Kupsc; A.Passeri; A.Ranieri; A.Sciubba; as members of the KLOE-2 collaboration: D.Babusci

arxiv: 1105.6067 · v3 · pith:XSQEHB47new · submitted 2011-05-30 · ✦ hep-ex

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

The KLOE Collaboration: F.Ambrosino , A.Antonelli , M.Antonelli , F.Archilli , I.Balwierz , G.Bencivenni , C.Bini , C.Bloise

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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

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classification ✦ hep-ex

keywords decayeta-experimentkloeobservationrarebckgbranching

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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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