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2011-05-30

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

The KLOE CollaborationF. AmbrosinoA. AntonelliM. AntonelliF. ArchilliI. BalwierzG. BencivenniC. BiniC. BloiseS. BocchettaF. BossiP. BranchiniG. CaponT. CapusselaF. CeradiniP. CiambroneE. CzerwinskiE. DeLuciaA. DeSantisP. DeSimoneG. DeZorziA. DenigA. DiDomenicoC. DiDonatoB. DiMiccoM. DreucciG. FeliciS. FioreP. FranziniC. GattiP. GauzziS. GiovannellaE. GrazianiM. JacewiczJ. Lee-FranziniM. MartemianovM. MartiniP. MassarottiS. MeolaS. MiscettiG. MorelloM. MoulsonS. MullerM. NapolitanoF. NguyenM. PalutanA. PasseriV. PateraI. PradoLonghiP. SantangeloB. SciasciaM. SilarskiT. SpadaroC. TacciniL. TortoraG. VenanzoniR. VersaciG. XuJ. Zdebikas members of the KLOE-2 collaborationD. BabusciD. BadoniV. BocciA. BudanoS. A. BulychjevP. CampanaE. DaneG. DeRobertisD. DomeniciO. ErriquezG. FanizziF. GonnellaF. HappacherB. HoistadE. IarocciT. JohanssonV. KulikovA. KupscF. LoddoM. MatsyukR. MessiD. MoriccianiP. MoskalA. RanieriI. SarraM. SchioppaA. SciubbaW. WislickiM. Wolke

所有作者

The KLOE CollaborationF. AmbrosinoA. AntonelliM. AntonelliF. ArchilliI. BalwierzG. BencivenniC. BiniC. BloiseS. BocchettaF. BossiP. BranchiniG. CaponT. CapusselaF. CeradiniP. CiambroneE. CzerwinskiE. DeLuciaA. DeSantisP. DeSimoneG. DeZorziA. DenigA. DiDomenicoC. DiDonatoB. DiMiccoM. DreucciG. FeliciS. FioreP. FranziniC. GattiP. GauzziS. GiovannellaE. GrazianiM. JacewiczJ. Lee-FranziniM. MartemianovM. MartiniP. MassarottiS. MeolaS. MiscettiG. MorelloM. MoulsonS. MullerM. NapolitanoF. NguyenM. PalutanA. PasseriV. PateraI. PradoLonghiP. SantangeloB. SciasciaM. SilarskiT. SpadaroC. TacciniL. TortoraG. VenanzoniR. VersaciG. XuJ. Zdebikas members of the KLOE-2 collaborationD. BabusciD. BadoniV. BocciA. BudanoS. A. BulychjevP. CampanaE. DaneG. DeRobertisD. DomeniciO. ErriquezG. FanizziF. GonnellaF. HappacherB. HoistadE. IarocciT. JohanssonV. KulikovA. KupscF. LoddoM. MatsyukR. MessiD. MoriccianiP. MoskalA. RanieriI. SarraM. SchioppaA. SciubbaW. WislickiM. Wolke

文献摘要

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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