Measurement of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si1.gif" overflow="scroll"><mml:mi>ψ</mml:mi><mml:mo stretchy="false">(</mml:mo><mml:mn>3770</mml:mn><mml:mo stretchy="false">)</mml:mo></mml:math> parameters

В.В. Анашин(Budker Institute of Nuclear Physics), V. Aulchenko(Budker Institute of Nuclear Physics), E. M. Baldin(Budker Institute of Nuclear Physics), A.K. Barladyan(Budker Institute of Nuclear Physics), A. Barnyakov(Budker Institute of Nuclear Physics), M.Yu. Barnyakov(Budker Institute of Nuclear Physics), S.E. Baru(Budker Institute of Nuclear Physics), I.Yu. Basok(Budker Institute of Nuclear Physics), O. Beloborodova(Budker Institute of Nuclear Physics), A. E. Blinov(Budker Institute of Nuclear Physics), V. E. Blinov(Budker Institute of Nuclear Physics), A. V. Bobrov(Budker Institute of Nuclear Physics), V. S. Bobrovnikov(Budker Institute of Nuclear Physics), A. Bogomyagkov(Budker Institute of Nuclear Physics), A. Bondar(Budker Institute of Nuclear Physics), А. Р. Бузыкаев(Budker Institute of Nuclear Physics), S.I. Eidelman(Novosibirsk State University), D. N. Grigoriev(Budker Institute of Nuclear Physics), Yu.M. Glukhovchenko(Budker Institute of Nuclear Physics), V.V. Gulevich(Budker Institute of Nuclear Physics), D.V. Gusev(Budker Institute of Nuclear Physics), S.E. Karnaev(Budker Institute of Nuclear Physics), Г. В. Карпов(Budker Institute of Nuclear Physics), С. Карпов(Budker Institute of Nuclear Physics), T. Kharlamova(Budker Institute of Nuclear Physics), В. А. Киселев(Budker Institute of Nuclear Physics), V. V. Kolmogorov(Budker Institute of Nuclear Physics), S.A. Kononov(Budker Institute of Nuclear Physics), Khristian Kotov(Budker Institute of Nuclear Physics), E. A. Kravchenko(Budker Institute of Nuclear Physics), V. Kulikov(Novosibirsk State University), G.Ya. Kurkin(Novosibirsk State Technical University), E.A. Kuper(Budker Institute of Nuclear Physics), E. Levichev(Budker Institute of Nuclear Physics), D.A. Maksimov(Budker Institute of Nuclear Physics), В. М. Малышев(Budker Institute of Nuclear Physics), A. L. Maslennikov(Budker Institute of Nuclear Physics), A.S. Medvedko(Novosibirsk State University), О. И. Мешков(Budker Institute of Nuclear Physics), S. I. Mishnev(Budker Institute of Nuclear Physics), И. И. Морозов(Budker Institute of Nuclear Physics), N. Yu. Muchnoi(Budker Institute of Nuclear Physics), V.V. Neufeld(Budker Institute of Nuclear Physics), С.А. Никитин(Budker Institute of Nuclear Physics), I. B. Nikolaev(Budker Institute of Nuclear Physics), I.N. Okunev(Budker Institute of Nuclear Physics), A. P. Onuchin(Novosibirsk State Technical University), S.B. Oreshkin(Budker Institute of Nuclear Physics), I.O. Orlov(Budker Institute of Nuclear Physics), A. A. Osipov(Budker Institute of Nuclear Physics), S. V. Peleganchuk(Budker Institute of Nuclear Physics), S.G. Pivovarov(Novosibirsk State Technical University), P. Piminov(Budker Institute of Nuclear Physics), Vladimir Petrov(Budker Institute of Nuclear Physics), A. Poluektov(Budker Institute of Nuclear Physics), V.G. Prisekin(Budker Institute of Nuclear Physics), A.A. Ruban(Budker Institute of Nuclear Physics), V.K. Sandyrev(Budker Institute of Nuclear Physics), G.A. Savinov(Budker Institute of Nuclear Physics), A.G. Shamov(Budker Institute of Nuclear Physics), D. Shatilov(Budker Institute of Nuclear Physics), B.A. Shwartz(Novosibirsk State University), E.A. Simonov(Budker Institute of Nuclear Physics), S. V. Sinyatkin(Budker Institute of Nuclear Physics), A.N. Skrinsky(Budker Institute of Nuclear Physics), Victor Smaluk(Budker Institute of Nuclear Physics), A. Sokolov(Budker Institute of Nuclear Physics), A.M. Sukharev(Budker Institute of Nuclear Physics), Е. В. Старостина(Budker Institute of Nuclear Physics), A.A. Talyshev(Budker Institute of Nuclear Physics), V.A. Tayursky(Budker Institute of Nuclear Physics), V. I. Telnov(Budker Institute of Nuclear Physics), Yu. A. Tikhonov(Novosibirsk State University), K. Yu. Todyshev(Novosibirsk State University), G.M. Tumaikin(Budker Institute of Nuclear Physics), Y. Usov(Budker Institute of Nuclear Physics), A.I. Vorobiov(Budker Institute of Nuclear Physics), A. N. Yushkov(Budker Institute of Nuclear Physics), V. Zhilich(Budker Institute of Nuclear Physics), V.V. Zhulanov(Novosibirsk State University), А. Н. Журавлев(Budker Institute of Nuclear Physics)
Physics Letters B
April 13, 2012
10.1016/j.physletb.2012.04.019
Cited by 32Open Access
Full Text

Abstract

We report the final results of a study of the \psi(3770) meson using a data sample collected with the KEDR detector at the VEPP-4M electron-positron collider. The data analysis takes into account the interference between the resonant and nonresonant $D\bar{D}$ production, where the latter is related to the nonresonant part of the energy-dependent form factor $F_D$. The vector dominance approach and several empirical parameterizations have been tried for the nonresonant $F_D^{\NR}(s)$. Our results for the mass and total width of \psi(3770) are M = 3779.2 ^{+1.8}_{-1.7} ^{+0.5}_{-0.7} ^{+0.3}_{-0.3} MeV, \Gamma =24.9 ^{+4.6}_{-4.0} ^{+0.5}_{-0.6} ^{+0.2}_{-0.9} MeV, where the first, second and third uncertainties are statistical, systematic and model, respectively. For the electron partial width two possible solutions have been found: (1) \Gamma_{ee} = 154 ^{+79}_{-58} ^{+17}_{-9} ^{+13}_{-25} eV, (2) \Gamma_{ee} = 414 ^{+72}_{-80} ^{+24}_{-26} ^{+90}_{-10} eV. Our statistics are insufficient to prefer one solution to another. The solution (2) mitigates the problem of non-$D\bar{D}$ decays but is disfavored by potential models. It is shown that taking into account the resonance--continuum interference in the near-threshold region affects resonance parameters, thus the results presented can not be directly compared with the corresponding PDG values obtained ignoring this effect.

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