Study of the Dalitz decay ϕ→ηe+e− with the KLOE detector
- D. Babusci
- I. Balwierz-Pytko
- G. Bencivenni
- C. Bloise
- F. Bossi
- P. Branchini
- A. Budano
- L. Caldeira 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 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. Heijkenskjöld
- B. Höistad
- T. Johansson
- D. Kamińska
- 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. Prado Longhi
- A. Ranieri
- P. Santangelo
- I. Sarra
- M. Schioppa
- B. Sciascia
- M. Silarski
- L. Tortora
- G. Venanzoni
- W. Wiślicki
- M. Wolke
Publication date
March 2015
DOI Publisher
Elsevier Journal
issn:0370-2693Abstract
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−1 of 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. Keywords: e+e− collisions, Conversion decay, Transition form facto
Add to ORKG