Study of the Dalitz decay ϕ→ηe

D. Babusci, I. Balwierz-Pytko, G. Bencivenni, C. Bloise, F. Bossih, P. Branchini, A. Budano, Caldeira L. Balkeståhl, F. Ceradini, P. Ciambrone, F. Curciarello, E. Czerwiński, E. Danè, V. De Leo, E. De Lucia, G. De Robertis, A. De Santis, P. De Simone, A. Di Cicco, A. Di DomenicoR. 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. Heijkenskjöld, B. Höistad, T. Johansson, D. Kamińskag, 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, I. PradoLonghi, A. Ranieri, P. Santangelo, I. Sarra, M. Schioppa, B. Sciascia, M. Silarski, L. Tortora, G. Venanzoni, W. Wiślicki, M. Wolke

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We have studied the vector to pseudoscalar conversion decay ϕ→ηe+e-, with η→π0π0π0, with the KLOE detector at DAΦNE. The data set of 1.7 fb-1of e+e-collisions at s~Mϕ contains a clear conversion decay signal of ~31, 000 events from which we measured a value of BR(ϕ→ηe+e-)=(1.075±0.007±0.038)×10-4. The same sample is used to determine the transition form factor by a fit to the e+e-invariant mass spectrum, obtaining bϕη=(1.28±0.10-0.08+0.09) GeV-2, that improves by a factor of five the precision of the previous measurement and is in good agreement with VMD expectations.
Original languageEnglish
Pages (from-to)1 - 6
Number of pages6
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Publication statusPublished - 6 Mar 2015
Externally publishedYes


All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics

Cite this

Babusci, D., Balwierz-Pytko, I., Bencivenni, G., Bloise, C., Bossih, F., Branchini, P., ... Wolke, M. (2015). Study of the Dalitz decay ϕ→ηe. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 742, 1 - 6.