Measurement of ψ(3770) parameters
Creators: name: Anashin, V. V.
name: Aulchenko, V. M.
name: Baldin, E. M.
name: Barladyan, A. K.
name: Barnyakov, A. Yu.
name: Barnyakov, M. Yu.
name: Baru, S. E.
name: Basok, I. Yu.
name: Beloborodova, O. L.
name: Blinov, A. E.
name: Blinov, V. E.
name: Bobrov, A. V.
name: Bobrovnikov, V. S.
name: Bogomyagkov, A. V.
name: Bondar, A. E.
name: Buzykaev, A. R.
name: Eidelman, S. I.
name: Grigoriev, D. N.
name: Glukhovchenko, Yu. M.
name: Gulevich, V. V.
name: Gusev, D. V.
name: Karnaev, S. E.
name: Karpov, G. V.
name: Karpov, S. V.
name: Kharlamova, T. A.
name: Kiselev, V. A.
name: Kolmogorov, V. V.
name: Kononov, S. A.
name: Kotov, K. Yu.
name: Kravchenko, E. A.
name: Kudryavtsev, V. N.
name: Kulikov, V. F.
name: Kurkin, G. Ya.
name: Kuper, E. A.
name: Levichev, E. B.
name: Maksimov, D. A.
name: Malyshev, V. M.
name: Maslennikov, A. L.
name: Medvedko, A. S.
name: Meshkov, O. I.
name: Mishnev, S. I.
name: Morozov, I. I.
name: Muchnoi, N. Yu.
name: Neufeld, V. V.
name: Nikitin, S. A.
name: Nikolaev, I. B.
name: Okunev, I. N.
name: Onuchin, A. P.
name: Oreshkin, S. B.
name: Orlov, I. O.
name: Osipov, A. A.
name: Peleganchuk, S. V.
name: Pivovarov, S. G.
name: Piminov, P. A.
name: Petrov, V. V.
name: Poluektov, A. O.
name: Prisekin, V. G.
name: Ruban, A. A.
name: Sandyrev, V. K.
name: Savinov, G. A.
name: Shamov, A. G.
name: Shatilov, D. N.
name: Shwartz, B. A.
name: Simonov, E. A.
name: Sinyatkin, S. V.
name: Skrinsky, A. N.
name: Smaluk, V. V.
name: Sokolov, A. V.
name: Sukharev, A. M.
name: Starostina, E. V.
name: Talyshev, A. A.
name: Tayursky, V. A.
name: Telnov, V. I.
name: Tikhonov, Yu. A.
name: Todyshev, K. Yu.
name: Tumaikin, G. M.
name: Usov, Yu. V.
name: Vorobiov, A. I.
name: Yushkov, A. N.
name: Zhilich, V. N.
name: Zhulanov, V. V.
name: Zhuravlev, A. N.
Publisher: name: arXiv
Year: 2011
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences
subject: FOS: Physical sciences

description: We report the final results of a study of the ψ(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 ψ(3770) are M = 3779.2 ^{+1.8}_{-1.7} ^{+0.5}_{-0.7} ^{+0.3}_{-0.3} MeV, Γ=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) Γ_{ee} = 154 ^{+79}_{-58} ^{+17}_{-9} ^{+13}_{-25} eV, (2) Γ_{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.