Measurement of J/ψ leptonic width with the KEDR detector

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A. G. Shamov (KEDR collaboration). Measurement of J/ψ leptonic width with the KEDR detector[J]. Chinese Physics C, 2010, 34(6): 836-841. doi: 10.1088/1674-1137/34/6/036
A. G. Shamov (KEDR collaboration). Measurement of J/ψ leptonic width with the KEDR detector[J]. Chinese Physics C, 2010, 34(6): 836-841.  doi: 10.1088/1674-1137/34/6/036 shu
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Received: 2010-02-05
Revised: 1900-01-01
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Measurement of J/ψ leptonic width with the KEDR detector

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

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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