Measurement of J/psi leptonic width with the KEDR detector
Measurement of J/psi leptonic width with the KEDR detector
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: ��_{ee}\times��_{ee}/��= 0.3323 \pm 0.0064 (stat.) \pm 0.0048 (syst.) keV ��_{ee}\times��_{����}/��=0.3318 \pm 0.0052 (stat.) \pm 0.0063 (syst.) keV. Assuming $e��$ universality and using the table value of the branching ratios the leptonic ��_{ll}= 5.59 \pm 0.12 keV width and the total ��=94.1 \pm 2.7 keV widths were obtained. We also discuss in detail a method to calculate radiative corrections at a narrow resonance.
Published in proceedings of the PhiPsi 2009 conference
- Siberian Branch of the Russian Academy of Sciences Russian Federation
- Budker Institute of Nuclear Physics Russian Federation
- Physical Sciences Division Russian Federation
High Energy Physics - Experiment (hep-ex), FOS: Physical sciences, High Energy Physics - Experiment
High Energy Physics - Experiment (hep-ex), FOS: Physical sciences, High Energy Physics - Experiment
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