STUDY OF Ψ(2s) → Μ+μ- DECAY WITH KEDR DETECTOR

V. M. AULCHENKO,E. M. BALDIN,A. K. BARLADYAN,A. Yu. BARNYAKOV, M. Yu. BARNYAKOV,S. E. BARU,I. Yu. BASOK,A. M. BATRAKOV,A. E. BLINOV,V. E. BLINOV,A. V. BOBROV,V. S. BOBROVNIKOV,A. V. BOGOMYAGKOV,A. E. BONDAR,A. R. BUZYKAEV,S. I. EIDELMAN,D. N. GRIGORIEV,V. R. GROSHEV,Yu. M. GLUKHOVCHENKO,V. V. GULEVICH,D. V. GUSEV,S. E. KARNAEV,G. V. KARPOV, S. V. KARPOV,T. A. KHARLAMOVA,V. A. KISELEV,V. V. KOLMOGOROV,S. A. KONONOV,K. Yu. KOTOV,E. A. KRAVCHENKO,V. N. KUDRYAVTSEV,V. F. KULIKOV,G. YA. KURKIN,E. A. KUPER,I. A. KUYANOV,E. B. LEVICHEV,D. A. MAKSIMOV,V. M. MALYSHEV,A. L. MASLENNIKOV,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. O. ORLOV,A. A. OSIPOV,I. V. OVTIN,S. V. PELEGANCHUK,S. G. PIVOVAROV,P. A. PIMINOV,V. V. PETROV,A. O. POLUEKTOV,V. G. PRISEKIN,O. L. REZANOVA,A. A. RUBAN,V. K. SANDYREV,G. A. SAVINOV,A. G. SHAMOV,D. N. SHATILOV,B. A. SHWARTZ,E. A. SIMONOV,S. V. SINYATKIN,A. N. SKRINSKY,A. M. SUKHAREV,A. V. SOKOLOV,E. V. STAROSTINA,A. A. TALYSHEV,V. A. TAYURSKY,V. I. TELNOV,Yu. A. TIKHONOV,K. Yu. TODYSHEV,G. M. TUMAIKIN,Yu. V. USOV,A. I. VOROBIOV,V. N. ZHILICH,V. V. ZHULANOV,A. N. ZHURAVLEV

International journal of modern physics Conference series（2014）

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Abstract

Since 2004 the KEDR detector at the VEPP-4M collider has taken several data sets in the ψ(2S) region, acquiring total luminosity of about 7 pb-1, which corresponds to more than 3.5 × 106ψ(2S). We report the preliminary value of Γee × Γμμ/Γ = 19.4 ± 0.4 ± 1.1 eV for ψ(2S).

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