Measurement of J/psi leptonic width with the KEDR detector

Details Measurement of J/psi leptonic width with the KEDR detector Measurement of J/psi leptonic width with the KEDR detector

2011-10-03

arxiv.org/abs/1110.0328v1

Chinese Phys. C34 (2010) 836

Physics

High Energy Physics

High Energy Physics - Experiment

Published in proceedings of the PhiPsi 2009 conference

Scientific paper

We report a new precise determination of the leptonic widths of the J/psi meson performed with the KEDR detector at the VEPP-4M $e^{+}e^{-}$ collider. The measured values of the J/psi parameters are: \Gamma_{ee}\times\Gamma_{ee}/\Gamma = 0.3323 \pm 0.0064 (stat.) \pm 0.0048 (syst.) keV \Gamma_{ee}\times\Gamma_{\mu\mu}/\Gamma=0.3318 \pm 0.0052 (stat.) \pm 0.0063 (syst.) keV. Assuming $e\mu$ universality and using the table value of the branching ratios the leptonic \Gamma_{ll}= 5.59 \pm 0.12 keV width and the total \Gamma=94.1 \pm 2.7 keV widths were obtained. We also discuss in detail a method to calculate radiative corrections at a narrow resonance.

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