Measurement of B(J/psi->eta_c gamma) at KEDR

V. V. Anashin,V. M. Aulchenko,E. M. Baldin,A. K. Barladyan,A. Yu. Barnyakov,M. Yu. Barnyakov,S. E. Baru,I. Yu. Basok,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,D. N. Shatilov,G. E. Pospelov,V. G. Prisekin,A. A. Ruban,V. K. Sandyrev,G. A. Savinov,A. G. Shamov,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,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

International journal of modern physics Conference series（2010）

Cited 21|Views85

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Abstract

We present a study of the inclusive photon spectrum from 6.3 million J/psi decays collected with the KEDR detector at the VEPP-4M e+e- collider. We measure the branching fraction of the radiative decay J/psi -> eta_c gamma, eta_c width and mass. Taking into account an asymmetric photon line shape we obtain: M(eta_c) = (2978.1 +- 1.4 +- 2.0) MeV/c^2, Gamma(eta_c) = (43.5 +- 5.4 +- 15.8) MeV, B(J/psi->eta_c gamma) = (2.59 +- 0.16 +- 0.31)%$.

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Key words

13.40.hq,radiative decays pacs numbers: 13.20.gd,14.40.pq,charmonium

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