Measurement of J/psi leptonic width with the KEDR detector

V V Anashin,V Aulchenko,E M Baldin,A K Barladyan,A Yu Barnyakov,S E Baru,I Yu Basok,O Beloborodova,A E Blinov,V E Blinov,A Bobrov,V S Bobrovnikov,A V Bogomyagkov,A Bondar,A R Buzykaev,S Eidelman,D N Grigoriev,Yu M Glukhovchenko,V V Gulevich,D V Gusev,S E Karnaev,G V Karpov,Sergey Karpov,T A Kharlamova,V A Kiselev,V V Kolmogorov,S A Kononov,K Yu Kotov,E A Kravchenko,V Kudryavtsev,V F Kulikov,G Ya Kurkin,E A Kuper,E B Levichev,D A Maksimov,V M Malyshev, A L Maslennikov,A S Medvedko,O I Meshkov,S I Mishnev,I I Morozov, N Yu Muchnoi,V V Neufeld,S A Nikitin,I B Nikolaev,I N Okunev,A P Onuchin,S B Oreshkin,I Orlov,A A Osipov,S V Peleganchuk,S G Pivovarov,P A Piminov,V V Petrov,A Poluektov,V G Prisekin,A A Ruban,V K Sandyrev,G A Savinov,A G Shamov,D N Shatilov,B Shwartz,E A Simonov,S V Sinyatkin,A N Skrinsky,V V Smaluk,A V Sokolov,A M Sukharev,E V Starostina,Alexey Talyshev,V A Tayursky,V I Telnov,Yu A Tikhonov,K Yu Todyshev,G M Tumaikin,Y Usov,A I Vorobiov,A N Yushkov,V Zhilich,V Zhulanov,A N Zhuravlev

CHINESE PHYSICS C（2010）

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摘要

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)x Gamma(ee)/Gamma = 0.3323 +/- 0.0064 (stat.) +/- 0.0048 (syst.) keV, Gamma(ee) x Gamma(mu mu)/Gamma= 0.3318 +/- 0.0052 (stat.) +/- 0.0063 (syst.) keV. Assuming e mu universality and using the table value of the branching ratios the leptonic Gamma(11)= 5.59 +/- 0.12 keV width and the total Gamma = 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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关键词

J/psi meson,lepton width,full width

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