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

Fabio Ambrosino,Angelo Antonelli,Mario Antonelli,Flavio Archilli,Izabela Balwierz,Giorgio Bencivenni,Cesare Bini,Caterina Bloise,Simona Serena Bocchetta,Fabio C. Bossi,Paolo Branchini,G. Capon,Tiziana Capussela,Filippo Ceradini,Paolo Ciambrone,Eryk Czerwiński,Erika De Lucia,Antonio De Santis,Patrizia De Simone,G. De Zorzi,Achim G. Denig,Antonio Di Domenico,Camilla Di Donato,Biagio D. Di Micco,Marco Dreucci,Giuseppe Felici,S. Fiore,Paolo Franzini,Claudio Gatti,Paolo Gauzzi,Simona Giovannella,Enrico Graziani,M. Jacewicz, Juliet Lee-Franzini,Maxim A. Martemianov,Manuele Martini,Paolo Massarotti,Sabino Meola,Stefano Miscetti,Gianfranco Morello,Matthew Moulson,Stefan E. Müller,M. Napolitano,Federico Nguyen,Matteo Palutan,Antonio Passeri,Vincenzo Patera,I. Prado Longhi,P. Santangelo,Barbara Sciascia,Michał Silarski,Tommaso Spadaro,Cecilia Taccini,L. Tortora,Graziano Venanzoni,Roberto Versaci,Guang Xu,Jarosław Zdebik,Danilo Babusci,Davide Badoni,Valerio Bocci,Antonio Budano,S. A. Bulychjev,Pierluigi L. Campana,E. Danè,Giuseppe De Robertis,D. Domenici,O. Erriquez,G. Fanizzi,Francesco Gonnella,F. Happacher,Bo Höistad,E. Iarocci,Tord Gunnar Johansson,Vladimir V. Kulikov,Andrzej Kupść,Flavio Loddo,M. A. Matsyuk,Roberto Messi,Dario Moricciani,Paweł L. Moskal,Antonio Ranieri,I. Sarra,Marco Schioppa,A. Sciubba,Wojciech Wiślicki,Magnus Wolke

Physics Letters B（2011）

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摘要

We report the first observation of the rare η→e+e−e+e−(γ) decay based on 1.7fb−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.

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关键词

e+e− collisions,Rare η decays

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