Observation of the Rare Η→e+e−e+e− Decay with the KLOE Experiment

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. De Lucia,A. De Santis, P. De Simone,G. De Zorzi, A. Denig, A. Di Domenico, C. Di Donato, B. Di Micco, 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. Mueller, M. Napolitano, F. Nguyen, M. Palutan, A. Passeri, V. Patera, I. Prado Longhi, P. Santangelo, B. Sciascia, M. Silarski, T. Spadaro, C. Taccini, L. Tortora, G. Venanzoni, R. Versaci, G. Xu, J. Zdebik

Physics letters B（2011）

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摘要

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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关键词

e(+)e(-) collisions,Rare eta decays

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