"We report the first observation of the rare eta -> e(+)e(-)e(+)e(-)(gamma) decay based on 1.7 fb(-1) collected by the KLOE experiment at the DA Phi NE 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). (C) 2011 Elsevier B.V. All rights reserved. RI Fiore, Salvatore\/C-9722-2011; Di Domenico, Antonio\/G-6301-2011; De Lucia, Erika\/D-2250-2011; branchini, paolo\/A-4857-2011"
Ambrosino, F., Ceradini, F., DI MICCO, B., PRADO LONGHI, I. (2011). Observation of the rare η → e+e-e+e- decay with the KLOE experiment. PHYSICS LETTERS. SECTION B, 702(5), 324-328 [10.1016/j.physletb.2011.07.033].
Observation of the rare η → e+e-e+e- decay with the KLOE experiment
CERADINI, Filippo;DI MICCO, Biagio;PRADO LONGHI, IVAN
2011-01-01
Abstract
"We report the first observation of the rare eta -> e(+)e(-)e(+)e(-)(gamma) decay based on 1.7 fb(-1) collected by the KLOE experiment at the DA Phi NE 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). (C) 2011 Elsevier B.V. All rights reserved. RI Fiore, Salvatore\/C-9722-2011; Di Domenico, Antonio\/G-6301-2011; De Lucia, Erika\/D-2250-2011; branchini, paolo\/A-4857-2011"I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
