Study of conversion decays phi->etae+e-, eta->e+e-g and eta->pi+pi-e+e- at CMD-2
High Energy Physics - Experiment
2008-11-26 v1
Abstract
Using 15.1 pb^{-1} of data collected by CMD-2 in the phi-meson energy range, the branching ratios of the following conversion decays have been measured: B(\phi\to\eta e^+e^-) = (1.14\pm0.10\pm0.06)\cdot10^{-4}, B(\eta\to e^+e^-\gamma) = (7.10\pm0.64\pm0.46)\cdot10^{-3}, B(\eta\to\pi^+\pi^-e^+e^-) = (3.7^{+2.5}_{-1.8}\pm0.3)\cdot10^{-4}. The upper limits for the following rare conversion decays have been obtained at the 90% confidence level: B(\phi\to\eta\mu^+\mu^-) < 9.4\cdot10^{-6}, B(\eta\to e^+e^-e^+e^-) < 6.9\cdot10^{-5}.
Cite
@article{arxiv.hep-ex/0012039,
title = {Study of conversion decays phi->etae+e-, eta->e+e-g and eta->pi+pi-e+e- at CMD-2},
author = {2 collaboration},
journal= {arXiv preprint arXiv:hep-ex/0012039},
year = {2008}
}
Comments
16 pages, 7 PostScript figures. To be published in Phys. Lett. B