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Measurement of the ratio of the leptonic widths $\Gamma_{ee}/\Gamma_{\mu\mu}$ for the $J/\psi$ meson

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arxiv 1311.5005 v4 pith:FR2NSHJS submitted 2013-11-20 hep-ex

classification hep-ex
keywords gammaleptonmesonratiowidthsaccuracyagreementanalysis
verification ladder T0 review T1 audit T2 compute T3 formal
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abstract

The ratio of the electron and muon widths of the $J/\psi$ meson has been measured using direct $J/\psi$ decays in the KEDR experiment at the VEPP-4M electron-positron collider. The result $\Gamma_{ee}(J/\psi)/\Gamma_{\mu\mu}(J/\psi)=1.0022\pm0.0044\pm0.0048\ (0.65\%)$ is in good agreement with the lepton universality. The experience collected during this analysis will be used for a $J/\psi$ lepton width determination with up to 1% accuracy.

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