6533b7d8fe1ef96bd126a222

RESEARCH PRODUCT

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

E. De LuciaR. MessiMarco SchioppaA. Di DomenicoFlavio ArchilliA. RanieriV. BocciPaweł MoskalM. MartemianovP. MassarottiVincenzo PateraAndrzej KupscC. BloiseStefan E. MüllerE. IarocciBarbara SciasciaM. MartiniF. CeradiniB. Di MiccoA. SciubbaM. NapolitanoL. TortoraMichał SilarskiP. De SimoneS. MeolaJ. Lee-franziniP. SantangeloG. FeliciO. ErriquezD. DomeniciM. A. MatsyukMarek JacewiczI. BalwierzClaudio GattiF. BossiI. Prado LonghiMagnus WolkeP. GauzziF. LoddoGianfranco MorelloM. MoulsonA. De SantisS. MiscettiSimona Serena BocchettaS. A. BulychjevS. GiovannellaC. Di DonatoG. De RobertisAntonio BudanoT. SpadaroW. WiślickiD. BabusciG. VenanzoniG. XuR. VersaciA. DenigPierluigi CampanaDavide BadoniA. PasseriP. CiambroneG. BencivenniG. De ZorziF. AmbrosinoT. CapusselaMassimo AntonelliEryk CzerwińskiI. SarraCecilia TacciniF. HappacherTord JohanssonA. AntonelliS. FioreBo HöistadE. GrazianiP. FranziniCesare BiniD. MoriccianiJarosław ZdebikE. DanéG. CaponM. PalutanF. GonnellaF. NguyenP. BranchiniM. DreucciG. FanizziV. V. Kulikov

subject

PhysicsNuclear physicsNuclear and High Energy PhysicsParticle physics010308 nuclear & particles physicsBranching fractionElectron–positron annihilation0103 physical sciencesRadiation010306 general physics01 natural sciences

description

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 ± 0.2 stat + bckg ± 0.1 syst ) × 10 − 5 .

yearjournalcountryeditionlanguage
2011-08-01Physics Letters B
https://doi.org/10.1016/j.physletb.2011.07.033