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Бадалян, А. М.; Баккер, Б. Л. Г.

doi:10.1016/j.physletb.2006.12.066

Cited by 9 publications

(4 citation statements)

References 38 publications

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“…Since the hyperfine splitting of the 5 3 S 1 level is small, ≤ 6 MeV [13], its mass practically coincides with the centroid mass, M (5S) = 4.70 GeV, calculated here, and lies close to the mass of the Belle resonance Y(4660) [4]. From Table 1 one can see that with exception of the 1P state all other masses are in good agreement with experiment, even for the states above the DD threshold.…”

Section: Vector and Pseudoscalar Decay Constantsmentioning

confidence: 99%

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Di-electron and two-photon widths in charmonium

Бадалян

Danilkin

2009

Phys. Atom. Nuclei

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The vector and pseudoscalar decay constants are calculated in the framework of the Field Correlator Method. Di-electron widths: Γee(J/ψ) = 5.41 keV, Γee(ψ ′ (3686)) = 2.47 keV, Γee(ψ ′′ (3770)) = 0.248 keV, in good agreement with experiment, are obtained with the same coupling, αs = 0.165, in QCD radiative corrections. We show that the larger αs = 0.191±0.004 is needed to reach agreement with experiment for Γγγ (ηc) = 7.22 keV, Γγγ (χ( 3 P0)) = 3.3 keV, Γγγ (χ( 3 P2)) = 0.54 keV, and also for Γ(J/ψ → 3g) = 59.5 keV, Γ(J/ψ → γ2g) = 5.7 keV. Meanwhile even larger αs = 0.238 gives rise to good description of Γ(ψ ′ → 3g) = 52.7 keV, Γ(ψ ′ → γ2g) = 3.5 keV, and provides correct ratio of the branching fractions: B(J/ψ→light hadrons) B(ψ ′ →light hadrons) = 0.24.

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Section: Vector and Pseudoscalar Decay Constantsmentioning

confidence: 99%

“…In [9] these factors are put equal unity: β V = β P = 1.0, i.e. the QCD correction is neglected, while in [10]- [13] their values are almost two times smaller, β V = 0.52 ± 0.06. The reason of this uncertainty partly occurs because the contribution of higher corrections remains unknown.…”

Section: Introductionmentioning

confidence: 99%

Di-electron and two-photon widths in charmonium

Бадалян

Danilkin

2009

Phys. Atom. Nuclei

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“…Just due to such a small value of α hf (m b ), taken in bottomonium, small HFS were obtained in Ref. [12], although their wave functions (w.f.) at the origin gave excellent descriptions of the dielectron widths for Υ(nS)(n = 1, 2, 3) [13].…”

Section: Introductionmentioning

confidence: 97%

“…[4] has demonstrated the importance of the smearing of the δ 3 (r )-function, from which one may * Electronic address: badalian@itep.ru † Electronic address: blg.bakker@few.vu.nl ‡ Electronic address: danilkin@itep.ru expect that for heavy mesons, containing a b-quark, the use of δ 3 (r ) may be a good approximation. For lighter mesons, like D, D s , and charmonium, a nonperturbative spin-spin potential may be essential, giving a contribution ∼ 10% [12]. Here we concentrate on bottomonium and the B q (q = n, s, c) mesons, for which nonperturbative contributions are small, and neglect the smearing effect, in this way avoiding to introduce several unknown parameters.…”

Section: Introductionmentioning

confidence: 99%