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Measurement of psi(3770) parameters | | V. V. Anashin
; V. M. Aulchenko
; E. M. Baldin
; A. K. Barladyan
; A. Yu. Barnyakov
; M. Yu. Barnyakov
; S. E. Baru
; I. Yu. Basok
; 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
; | | Date: |
20 Sep 2011 | | 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 $Dar{D}$ 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) assuming psi(2S)
dominance in $F_D^{NR}(s)$, are M = 3779.1 ^{+1.8}_{-1.7} +-0.6 ^{+0.2}_{-0.3}
MeV/c^2, Gamma =25.2 ^{+4.6}_{-4.1} +-0.5 ^{+0.5}_{-0.2} 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} = 147 ^{+97}_{-62} +- 13 ^{+11}_{-10} eV, (2)
Gamma_{ee} = 415 ^{+59}_{-58} +- 38 ^{+160}_{-10} eV. Our statistics are
insufficient to prefer one solution to another. The solution (2) is strongly
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. | | Source: | arXiv, 1109.4205 | | Services: | Forum | Review | PDF | Favorites | |
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