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Study of conversion decays φ →ηe+e-, η → e+e-γ and η→π+π-e+e- at CMD-2
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DOI：10.1016/S0370-2693(01)00123-X.png)
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Abstract
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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 --> etae(+)e(-)) = (1.14 +/- 0.10 +/- 0.06) x 10(-4), B(eta --> e(+)e(-)gamma) = (7.10 +/- 0.64 +/- 0.46) x 10(-3), B(eta --> pi (+)pi (-)e(+)e(-)) = (3.7(-1.8)(+2.5) +/- 0.3) x 10(-4). The upper limits for the following rare conversion decays have been obtained at the 90% confidence level: B(phi --> eta mu (+)mu (-)) < 9.4 x 10(-6), B( --> e(+)e(-)e(+)e(-)) < 6.9 x 10(-5). (C) 2001 Published by Elsevier Science B.V.
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