Measurement of the φ to π⁰ e^+e^- transition form factor with the KLOE detector

KLOE-2 Collaboration: A. Anastasi , D. Babusci , G. Bencivenni , M. Berlowski , C. Bloise , F. Bossi , P. Branchini , A. Budano

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L. Caldeira Balkest{\aa}hl B. Cao F. Ceradini P. Ciambrone F. Curciarello E. Czerwi\'nski G. D'Agostini E. Dan\`e V. De Leo E. De Lucia A. De Santis P. De Simone A. Di Cicco A. Di Domenico R. Di Salvo D. Domenici A. d'Uffizi A. Fantini G. Felici S. Fiore A. Gajos P. Gauzzi G. Giardina S. Giovannella E. Graziani F. Happacher L. Heijkenskj\"old W. Ikegami Andersson T. Johansson D. Kami\'nska W. Krzemien A. Kupsc S. Loffredo G. Mandaglio M. Martini M. Mascolo R. Messi S. Miscetti G. Morello D. Moricciani P. Moskal M. Papenbrock A. Passeri V. Patera E. Perez del Rio A. Ranieri P. Salabura P. Santangelo I. Sarra M. Schioppa M. Silarski F. Sirghi L. Tortora G. Venanzoni W. Wi\'slicki M. Wolke

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classification ✦ hep-ex hep-ph

keywords measurementdecayeventsfactorformkloetransitionagreement

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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.

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Measurement of the φ to π⁰ e^+e^- transition form factor with the KLOE detector

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