| Autor: |
M. Berlowski, G. D'Agostini, E. Dané, A. D'Uffizi, Paolo Santangelo, G. Giardina, G. Felici, Wojciech Krzemien, Eryk Czerwiński, A. Passeri, L. Caldeira Balkeståhl, I. Sarra, F. Sirghi, P. Branchini, S. Loffredo, A. Fantini, A. Anastasi, Lena Heijkenskjöld, D. Moricciani, Antonio Budano, Filippo Ceradini, A. Di Cicco, L. Tortora, F. Happacher, Aleksander Gajos, W. Ikegami Andersson, S. Giovannella, Vincenzo Patera, R. Messi, T. Johansson, Daria Kamińska, Andrzej Kupsc, M. Papenbrock, V. De Leo, F. Bossi, E. De Lucia, Paolo Ciambrone, D. Domenici, R. Di Salvo, G. Venanzoni, Giuseppe Mandaglio, F. Curciarello, Wojciech Wiślicki, B. Cao, S. Fiore, E. Perez del Rio, E. Graziani, G. Bencivenni, Magnus Wolke, P. Gauzzi, Piotr Salabura, S. Miscetti, A. De Santis, P. De Simone, M. Mascolo, A. Di Domenico, Michał Silarski, Paweł Moskal, Gianfranco Morello, D. Babusci, Marco Schioppa, C. Bloise, A. Ranieri, M. Martini |
| Přispěvatelé: |
Anastasi, A., Ceradini, Filippo, DI CICCO, Alessandro, Loffredo, Salvatore, Fiore, S. |
| Jazyk: |
angličtina |
| Rok vydání: |
2016 |
| Předmět: |
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| Zdroj: |
Physics Letters B |
| Popis: |
A measurement of the vector to pseudoscalar conversion decay $\phi \to \pi^0 e^+e^-$ with the KLOE experiment is presented. A sample of $\sim 9500$ signal events was selected from a data set of 1.7 fb$^{-1}$ of $e^+e^-$ collisions at $\sqrt{s} \sim m_{\phi}$ collected at the DA$\Phi$NE $e^+e^-$ collider. These events were used to obtain the first measurement of the transition form factor $| F_{\phi \pi^0}(q^2) |$ and a new measurement of the branching ratio of the decay: $\rm{BR}\,(\phi \to \pi^0 e^+e^-) = (\,1.35 \pm 0.05^{\,\,+0.05}_{\,\,-0.10}\,) \times 10 ^{-5}$. The result improves significantly on previous measurements and is in agreement with theoretical predictions.
Comment: 13 pages, 4 figures; matches published version |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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