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

Babusci, D. (author)
Balwierz-Pytko, I. (author)
Bencivenni, G. (author)
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Bloise, C. (author)
Bossi, F. (author)
Branchini, P. (author)
Budano, A. (author)
Balkeståhl, Li Caldeira (author)
Ceradini, F. (author)
Ciambrone, P. (author)
Curciarello, F. (author)
Czerwinski, E. (author)
Dane, E. (author)
De Leo, V. (author)
De Luciah, E. (author)
De Robertis, G. (author)
De Santis, A. (author)
De Simone, P. (author)
Di Cicco, A. (author)
Di Domenico, A. (author)
Di Salvo, R. (author)
Domenici, D. (author)
Erriqueza, O. (author)
Fanizzia, G. (author)
Fantinio, A. (author)
Felici, G. (author)
Fiore, S. (author)
Franzini, P. (author)
Gajos, A. (author)
Gauzzi, P. (author)
Giardina, G. (author)
Giovannella, S. (author)
Graziani, E. (author)
Happacher, F. (author)
Heijkenskjöld, Lena (author)
Höistad, Bo (author)
Johansson, Tord (author)
Kaminska, D. (author)
Krzemien, W. (author)
Kupsc, Andrzej (author)
Lee-Franzini, J. (author)
Loddo, F. (author)
Loffredo, S. (author)
Mandaglio, G. (author)
Martemianov, M. (author)
Martini, M. (author)
Mascolo, M. (author)
Messi, R. (author)
Miscetti, S. (author)
Morello, G. (author)
Moricciani, D. (author)
Moskal, P. (author)
Palladino, A. (author)
Passeri, A. (author)
Patera, V. (author)
Longhi, I. Prado (author)
Ranieri, A. (author)
Santangelo, P. (author)
Sarra, I. (author)
Schioppa, M. (author)
Sciascia, B. (author)
Silarski, M. (author)
Tortora, L. (author)
Venanzoni, G. (author)
Wislicki, W. (author)
Wolke, Magnus (author)
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 (publisher)
2015
2015
English.
In: Physics Letters B. - 0370-2693. ; 742, 1-6
  • swepub:Mat__t
Abstract Subject headings
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  • We have studied the vector to pseudoscalar conversion decay phi -> eta e(+)e(-), with.. eta -> pi(0)pi(0)pi(0), with the KLOE detector at DA phi NE. The data set of 1.7 fb(-1) of e(+)e(-) collisions at root s similar to M-phi contains a clear conversion decay signal of similar to 31,000 events from which we measured a value of BR(phi -> eta e(+)e-) = (1.075 +/- 0.007 +/- 0.038) x 10(-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)=( 1.28 +/- 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.

Subject headings

Natural Sciences  (hsv)
Physical Sciences  (hsv)
Naturvetenskap  (hsv)
Fysik  (hsv)

Keyword

e(+)e(-) collisions
Conversion decay
Transition form factor

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