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Measurement of J/psi to eta_c gamma at KEDR

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arxiv 1002.2071 v2 pith:UROEZIAJ submitted 2010-02-10 hep-ex

Measurement of J/psi to 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.V. Bedny
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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.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
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keywords gammakedrbranchingcollectedcolliderdecaydecaysdetector
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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)%.

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    Proposes new photon line shape and branching fraction extraction method for J/psi to gamma eta_c, claiming compatibility between PDG data correlations and lattice QCD widths via profile scan.