Study of Dalitz decay phi -> eta e+e- with KLOE detector
High Energy Physics - Experiment
2015-06-22 v1
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.
Cite
@article{arxiv.1409.4582,
title = {Study of Dalitz decay phi -> eta e+e- with KLOE detector},
author = {D. Babusci and I. Balwierz-Pytko and G. Bencivenni and C. Bloise and F. Bossi and P. Branchini and A. Budano and L. Caldeira Balkestahl and F. Ceradini and P. Ciambrone and F. Curciarello and E. Czerwinski and E. Dane' and V. De Leo and E. De Lucia and G. De Robertis and A. De Santis and P. De Simone and A. Di Cicco and A. Di Domenico and R. Di Salvo and D. Domenici and O. Erriquez and G. Fanizzi and A. Fantini and G. Felici and S. Fiore and P. Franzini and A. Gajos and P. Gauzzi and G. Giardina and S. Giovannella and E. Graziani and F. Happacher and L. Heijkenskjold and B. Hoistad and T. Johansson and D. Kaminska and W. Krzemien and A. Kupsc and J. Lee-Franzini and F. Loddo and S. Loffredo and G. Mandaglio and M. Martemianov and M. Martini and M. Mascolo and R. Messi and S. Miscetti and G. Morello and D. Moricciani and P. Moskal and A. Palladino and A. Passeri and V. Patera. Prado Longhi and A. Ranieri and P. Santangelo and I. Sarra and M. Schioppa and B. Sciascia and M. Silarski and L. Tortora and G. Venanzoni and W. Wislicki and M. Wolke},
journal= {arXiv preprint arXiv:1409.4582},
year = {2015}
}
Comments
13 pages, 6 figures, submitted to PLB