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

Abstract

We have studied the vector to pseudoscalar conversion decay phi -> eta e+e-, with eta -> pi0pi0pi0, with the KLOE detector at DAPHNE. The data set of 1.7 fb-1 of e+e- collisions at sqrt(s)~Mphi contains a clear conversion decay signal of ~31,000 events from which we measured a value of BR(phi -> eta e+e-)=(1.075+-0.007+-0.038)x10-4. 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) =(1.17 +- 0.10 + 0.07) GeV-2, that improves by a factor of five the precision of the previous measurement and is in good agreement with VMD expectations.

13 pages, 6 figures, submitted to PLB

References in corpus (7)

• Searching for the light dark gauge boson in GeV-scale experiments
• Limit on the production of a light vector gauge boson in phi meson decays with the KLOE detector
• Dilepton Spectra from Decays of Light Unflavored Mesons
• Data handling, reconstruction, and simulation for the KLOE experiment
• Electromagnetic transition form factors of light vector mesons
• Measurement of the DA$\Phi$NE luminosity with the KLOE detector using large angle Bhabha scattering
• Study of conversion decays phi->etae+e-, eta->e+e-g and eta->pi+pi-e+e- at CMD-2

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