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18 April 2024

» arxiv » 1409.4582

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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 ; 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 ;
Date:	16 Sep 2014
Abstract:	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.
Source:	arXiv, 1409.4582
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