Measurement of J/psi to eta_c gamma at KEDR

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

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Measurement of J/psi to eta_c gamma at KEDR

Authors: A. A Osipov
A. A Ruban
A. A Talyshev
A. E Blinov
A. E Bondar
A. G Shamov
A. I Milstein
A. I Vorobiov
A. K Barladyan
A. L Maslennikov
A. M Sukharev
A. N Skrinsky
A. N Yushkov
A. N Zhuravlev
A. O Poluektov
A. P Onuchin
A. R Buzykaev
A. S Medvedko
A. V Bobrov
A. V Bogomyagkov
A. V Sokolov
A. Yu Barnyakov
Anashin V
B. A Shwartz
Beilin V A
D. A Maksimov
D. N Shatilov
D. V Gusev
E. A Kravchenko
E. A Kuper
E. A Simonov
E. B Levichev
E. M Baldin
E. V Starostina
G. A Savinov
G. E Pospelov
G. M Tumaikin
G. V Karpov
G. Ya Kurkin
I. B Nikolaev
I. I Morozov
I. N Okunev
I. N Popkov
I. O Orlov
I. V Bedny
K. Yu Kotov
K. Yu Todyshev
M. Yu Barnyakov
N. Yu Muchnoi
O. I Meshkov
O. L Beloborodova
P. A Piminov
S. A Kononov
S. A Nikitin
S. B Oreshkin
S. E Baru
S. E Karnaev
S. G Pivovarov
S. I Eidelman
S. I Mishnev
S. V Karpov
S. V Peleganchuk
S. V Sinyatkin
T. A Kharlamova
V. A Kiselev
V. A Tayursky
V. E Blinov
V. F Kulikov
V. G Prisekin
V. I Telnov
V. K Sandyrev
V. M Aulchenko
V. M Malyshev
V. N Zhilich
V. S Bobrovnikov
V. V Anashin
V. V Gulevich
V. V Neufeld
V. V Petrov
V. V Smaluk
V. V Zhulanov
Yu. A Tikhonov
Yu. I Skovpen
Yu. M Glukhovchenko
Yu. V Usov
Publication date: 17 March 2010
Publisher: 'IOP Publishing'
Doi

Abstract

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 to eta_c gamma, eta_c width and mass. Our preliminary results are: M(eta_c) = 2979.4+-1.5+-1.9 MeV, G(eta_c) = 27.8+-5.1+-3.3 MeV, B(J/psi to eta_c gamma) = (2.34+-0.15+-0.40)%.Comment: To be published in Proceedings of the PhiPsi09, Oct. 13-16, 2009, Beijing, Chin

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