| Autor: |
Babusci, D., Balwierz Pytko, I., Bencivenni, G., Bloise, C., Bossi, F., Branchini, P., Budano, A., Balkeståhl, L. C., Ceradini, F., Ciambrone, P., Curciarello, Francesca, Czerwiński, E., Danè, E., DE LEO, Veronica, De Lucia, E., De Robertis, G., De Santis, A., De Simone, P., Di Cicco, A., Domenico, A. D., Salvo, R. D., Domenici, D., Erriquez, O., Fanizzi, G., Fantini, A., Felici, G., Fiore, S., Franzini, P., Gajos, A., Gauzzi, P., Giardina, Giorgio 42, Giovannella, S., Graziani, E., Happacher, F., Heijkenskjöld, L., Höistad, B., Johansson, T., Kacprzak, K., Kamińska, D., Krzemien, W., Kupsc, A., Lee Franzini, J., Loddo, F., Loffredo, S., Mandaglio, Giuseppe, Martemianov, M., Martini, M., Mascolo, M., Messi, R., Miscetti, S., Morello, G., Moricciani, D., Moskal, P., Nguyen, F., Palladino, A., Passeri, A., Patera, V., Longhi, I. P., Ranieri, A., Santangelo, P., Sarra, I., Schioppa, M., Sciascia, B., Silarski, M., Tortora, L., Venanzoni, G., Wiślicki, W., Wolke, M., Zdebik, J. |
| Přispěvatelé: |
Fiore, S., Babusci, D., Ceradini, Filippo, DI CICCO, Alessandro, Loffredo, Salvatore, PRADO LONGHI, Ivan |
| Jazyk: |
angličtina |
| Rok vydání: |
2015 |
| Předmět: |
|
| Zdroj: |
Physics Letters B, Vol 742, Iss, Pp 1-6 (2015)
Physics Letters B |
| Popis: |
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 factor |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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