Measurement of J/ψ leptonic width with the KEDR detector

A. G. Shamov (KEDR collaboration)

doi:10.1088/1674-1137/34/6/036

Chinese Physics C> 2010, Vol. 34> Issue(6) : 836-841 DOI: 10.1088/1674-1137/34/6/036

Measurement of J/ψ leptonic width with the KEDR detector

A. G. Shamov (KEDR collaboration)

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

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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: Γ_ee×Γ_ee/Γ=0.3323±0.0064 (stat.)±0.0048(syst.) keV, Γ_ee×Γ_μμ/Γ=0.3318±0.0052 (stat.)±0.0063 (syst.) keV. Assuming eμ universality and using the table value of the branching ratios the leptonic Γ_ll=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.

References

[1]

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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
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沈阳化工大学材料科学与工程学院沈阳 110142

Measurement of J/ψ leptonic width with the KEDR detector

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

Received Date: 2010-02-05

Accepted Date: 1900-01-01

Available Online: 2010-06-05

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: Γ_ee×Γ_ee/Γ=0.3323±0.0064 (stat.)±0.0048(syst.) keV, Γ_ee×Γ_μμ/Γ=0.3318±0.0052 (stat.)±0.0063 (syst.) keV. Assuming eμ universality and using the table value of the branching ratios the leptonic Γ_ll=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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Measurement of J/ψ leptonic width with the KEDR detector

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