Study of Dalitz decay phi -> eta e+e- with KLOE detector

D. Babusci , I. Balwierz-Pytko , G. Bencivenni , C. Bloise , F. Bossi , P. Branchini , A. Budano , L. Caldeira Balkestahl

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F. Ceradini P. Ciambrone F. Curciarello E. Czerwinski E. Dane' V. De Leo E. De Lucia G. De Robertis A. De Santis P. De Simone A. Di Cicco A. Di Domenico R. Di Salvo D. Domenici O. Erriquez G. Fanizzi A. Fantini G. Felici S. Fiore P. Franzini A. Gajos P. Gauzzi G. Giardina S. Giovannella E. Graziani F. Happacher L. Heijkenskjold B. Hoistad T. Johansson D. Kaminska W. Krzemien A. Kupsc J. Lee-Franzini F. Loddo S. Loffredo G. Mandaglio M. Martemianov M. Martini M. Mascolo R. Messi S. Miscetti G. Morello D. Moricciani P. Moskal A. Palladino A. Passeri V. Patera. Prado Longhi A. Ranieri P. Santangelo I. Sarra M. Schioppa B. Sciascia M. Silarski L. Tortora G. Venanzoni W. Wislicki M. Wolke

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classification ✦ hep-ex

keywords decayconversiondetectorfactorkloeagreementclearcollisions

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We have studied the vector to pseudoscalar conversion decay phi -> eta e+e-, with eta -> pi0pi0pi0, with the KLOE detector at DAPHNE. The data set of 1.7 fb-1 of e+e- collisions at sqrt(s)~Mphi contains a clear conversion decay signal of ~31,000 events from which we measured a value of BR(phi -> eta e+e-)=(1.075+-0.007+-0.038)x10-4. The same sample is used to determine the transition form factor by a fit to the e+e- invariant mass spectrum, obtaining b(phi eta) =(1.17 +- 0.10 + 0.07) GeV-2, that improves by a factor of five the precision of the previous measurement and is in good agreement with VMD expectations.

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Study of Dalitz decay phi -> eta e+e- with KLOE detector

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