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D'Agostini, G. Felici, G. Giardina, G. Mandaglio, G. Morello, G. Venanzoni, I. Sarra, KLOE-2 Collaboration: A. Anastasi, L. Caldeira Balkest{\\aa}hl, L. Heijkenskj\\\"old, L. Tortora, M. Berlowski, M. Martini, M. Mascolo, M. Papenbrock, M. Schioppa, M. Silarski, M. Wolke, P. Branchini, P. Ciambrone, P. De Simone, P. Gauzzi, P. Moskal, P. Salabura P. Santangelo, R. Di Salvo, R. Messi, S. Fiore, S. Giovannella, S. Loffredo, S. Miscetti, T. Johansson, V. De Leo, V. Patera, W. Ikegami Andersson, W. Krzemien, W. Wi\\'slicki","submitted_at":"2016-01-25T11:41:14Z","abstract_excerpt":"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: $\\rm{BR}\\,(\\phi \\to \\pi^0 e^+e^-) = (\\,1.35 \\pm 0.05^{\\,\\,+0.05}_{\\,\\,-0.10}\\,) \\times 10 ^{-5}$. 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Budano, A. De Santis, A. Di Cicco, A. Di Domenico, A. d'Uffizi, A. Fantini, A. Gajos, A. Kupsc, A. Passeri, A. Ranieri, B. Cao, C. Bloise, D. Babusci, D. Domenici, D. Kami\\'nska, D. Moricciani, E. Czerwi\\'nski, E. Dan\\`e, E. De Lucia, E. Graziani, E. Perez del Rio, F. Bossi, F. Ceradini, F. Curciarello, F. Happacher, F. Sirghi, G. Bencivenni, G. D'Agostini, G. Felici, G. Giardina, G. Mandaglio, G. Morello, G. Venanzoni, I. Sarra, KLOE-2 Collaboration: A. Anastasi, L. Caldeira Balkest{\\aa}hl, L. Heijkenskj\\\"old, L. Tortora, M. Berlowski, M. Martini, M. Mascolo, M. Papenbrock, M. Schioppa, M. Silarski, M. Wolke, P. Branchini, P. Ciambrone, P. De Simone, P. Gauzzi, P. Moskal, P. Salabura P. Santangelo, R. Di Salvo, R. Messi, S. Fiore, S. Giovannella, S. Loffredo, S. Miscetti, T. Johansson, V. De Leo, V. Patera, W. Ikegami Andersson, W. Krzemien, W. 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