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Observation of the rare η→e+e−e+e− decay with the KLOE experiment

Authors :
Ambrosino, F.
Antonelli, A.
Antonelli, M.
Archilli, F.
Balwierz, I.
Bencivenni, G.
Bini, C.
Bloise, C.
Bocchetta, S.
Bossi, F.
Branchini, P.
Capon, G.
Capussela, T.
Ceradini, F.
Ciambrone, P.
Czerwiński, E.
De Lucia, E.
De Santis, A.
De Simone, P.
De Zorzi, G.
Denig, A.
Di Domenico, A.
Di Donato, C.
Di Micco, B.
Dreucci, M.
Felici, G.
Fiore, S.
Franzini, P.
Gatti, C.
Gauzzi, P.
Giovannella, S.
Graziani, E.
Jacewicz, M.
Lee-Franzini, J.
Martemianov, M.
Martini, M.
Massarotti, P.
Meola, S.
Miscetti, S.
Morello, G.
Moulson, M.
Müller, S.
Napolitano, M.
Nguyen, F.
Palutan, M.
Passeri, A.
Patera, V.
Prado Longhi, I.
Santangelo, P.
Sciascia, B.
Silarski, M.
Spadaro, T.
Taccini, C.
Tortora, L.
Venanzoni, G.
Versaci, R.
Xu, G.
Zdebik, J.
Babusci, D.
Badoni, D.
Bocci, V.
Budano, A.
Bulychjev, S.A.
Campana, P.
Dané, E.
De Robertis, G.
Domenici, D.
Erriquez, O.
Fanizzi, G.
Gonnella, F.
Happacher, F.
Höistad, B.
Iarocci, E.
Johansson, T.
Kulikov, V.
Kupsc, A.
Loddo, F.
Matsyuk, M.
Messi, R.
Moricciani, D.
Moskal, P.
Ranieri, A.
Sarra, I.
Schioppa, M.
Sciubba, A.
Wiślicki, W.
Wolke, M.
Source :
Physics Letters B. (5):324-328
Publisher :
Elsevier B.V.

Abstract

We report the first observation of the rare η→e+e−e+e−(γ) decay based on 1.7 fb−1 collected by the KLOE experiment at the DAΦNE ϕ-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±0.2stat+bckg±0.1syst)×10−5.

Subjects

Subjects :
e+e− collisions
Rare η decays

Details

Language :
English
ISSN :
03702693
Issue :
5
Database :
OpenAIRE
Journal :
Physics Letters B
Accession number :
edsair.core.ac.uk....25e659f825bb1ebf6264e9c9684fcb27
Full Text :
https://doi.org/10.1016/j.physletb.2011.07.033
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