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Measurement of main parameters of the psi(2S) resonance

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arxiv 1109.4215 v2 pith:5KKVGRKK submitted 2011-09-20 hep-ex

Measurement of main parameters of the psi(2S) resonance

V.V.Anashin , V.M.Aulchenko , E.M.Baldin , A.K.Barladyan , A.Yu.Barnyakov , M.Yu.Barnyakov , S.E.Baru , I.Yu.Basok
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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 D.N.Grigoriev 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 E.B.Levichev D.A.Maksimov V.M.Malyshev A.L.Maslennikov A.S.Medvedko 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 S.V.Peleganchuk S.G.Pivovarov P.A.Piminov V.V.Petrov A.O.Poluektov 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 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
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classification hep-ex
keywords widthbranchingelectrongammaassumptionscrossdependenceenergy
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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A high-precision determination of the main parameters of the \psi(2S) resonance has been performed with the KEDR detector at the VEPP-4M e^{+}e^{-} collider in three scans of the \psi(2S) -- \psi(3770) energy range. Fitting the energy dependence of the multihadron cross section in the vicinity of the \psi(2S) we obtained the mass value M = 3686.114 +- 0.007 +- 0.011 ^{+0.002}_{-0.012} MeV and the product of the electron partial width by the branching fraction into hadrons \Gamma_{ee}*B_{h} = 2.233 +- 0.015 +- 0.037 +- 0.020 keV. The third error quoted is an estimate of the model dependence of the result due to assumptions on the interference effects in the cross section of the single-photon e^{+}e^{-} annihilation to hadrons explicitly considered in this work. Implicitly, the same assumptions were employed to obtain the charmonium leptonic width and the absolute branching fractions in many experiments. Using the result presented and the world average values of the electron and hadron branching fractions, one obtains the electron partial width and the total width of the \psi(2S): \Gamma_{ee} =2.282 +- 0.015 +- 0.038 +- 0.021 keV, \Gamma = 296 +- 2 +- 8 +- 3 keV. These results are consistent with and more than two times more precise than any of the previous experiments.

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