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ISSN - 03702693, Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 2012, vol. 711, p. 292-300

Measurement of ψ(3770) parameters

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

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 interference between the resonant and nonresonant DD - 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 FDNR(s).Our results for the mass and total width of ψ(3770) are. M=3779.2-1.7+1.8-0.7+0.5-0.3+0.3MeV,Γ=24.9-4.0+4.6-0.6+0.5-0.9+0.2MeV, 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)Γee=154-58+79-9+17-25+13eV,(2)Γee=414-80+72-26+24-10+90eV. Our statistics are insufficient to prefer one solution to another. The Solution (2) mitigates the problem of non-. DD - 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 cannot be directly compared with the corresponding PDG values obtained ignoring this effect. © 2012.