Measurement of J/ψ leptonic width with the KEDR detector

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2010 Chinese Physical Society and the Institute of High Energy Physics of the Chinese Academy of Sciences and the Institute of Modern Physics of the Chinese Academy of Sciences and IOP Publishing Ltd
, , Citation A. G. Shamov and (KEDR collaboration) 2010 Chinese Phys. C 34 836 DOI 10.1088/1674-1137/34/6/036

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A.G.Shamov@inp.nsk.su

Author affiliations

1 Budker Institute of Nuclear Physics, 11, Lavrentiev prospect, Novosibirsk, 630090, Russia

Dates

  1. Received 26 January 2010
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1674-1137/34/6/836

Abstract

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: Γee×Γee/Γ = 0.3323±0.0064(stat.) ±0.0048 (syst.) keV,Γee×Γμμ/Γ = 0.3318±0.0052(stat.) ±0.0063 (syst.) keV. Assuming eμ universality and using the table value of the branching ratios the leptonic Γll = 5.59±0.12 keV width and the total Γ = 94.1±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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10.1088/1674-1137/34/6/036