Measurement of J/ψ → η_cγ at KEDR

V. V Anashin,V. M Aulchenko,E. M Baldin,A. K Barladyan,A. Yu Barnyakov,M. Yu Barnyakov,S. E Baru,I. V Bedny,O. L Beloborodova,A. E Blinov,V. E Blinov,A. V Bobrov,V. S Bobrovnikov,A. V Bogomyagkov,A. E Bondar,A. R Buzykaev,S. I Eidelman,Yu. M Glukhovchenko,V. V Gulevich,D. V Gusev,S. E Karnaev,G. V Karpov,S. V Karpov, T. A Kharlamova,V. A Kiselev,S. A Kononov,K. Yu Kotov,E. A Kravchenko,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,A. I Milstein,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,S. V Peleganchuk,S. G Pivovarov,P. A Piminov,V. V Petrov,A. O Poluektov,I. N Popkov,G. E Pospelov,V. G Prisekin,A. A Ruban,V. K Sandyrev,G. A Savinov,A. G Shamov,D. N Shatilov,B. A Shwartz,E. A Simonov,S. V Sinyatkin,Yu. I Skovpen,A. N Skrinsky,V. V Smaluk,A. V Sokolov,A. M Sukharev,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,A. N Yushkov,V. N Zhilich, V. V Zhulanov,A. N Zhuravlev

CHINESE PHYSICS C（2010）

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摘要

We present a study of the inclusive photon spectra from 5.9 million J/psi decays collected with the KEDR detector at the VEPP-4M e(+)e(-) collider. We measure the branching fraction of radiative decay J/psi -> eta(c)gamma, eta(c) width and mass. Our preliminary results are: M(eta(c)) = 2979.4 +/- 1.5 +/- 1.9 MeV/c(2), Gamma(eta(c)) = 27.8 +/- 5.1 +/- 3.3 MeV, B(J/psi -> eta(c)gamma) = (2.34 +/- 0.15 +/- 0.40)%.

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关键词

eta(c) meson,full width,mass,radiative decay

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Measurement of J/ψ → ηcγ at KEDR

Measurement of J/ψ → η_cγ at KEDR