4,398 research outputs found
Relativistic description of the charmonium mass spectrum
The charmonium mass spectrum is considered in the framework of the
constituent quark model with the relativistic treatment of the c quark. The
obtained masses are in good agreement with the existing experimental data
including the mass of eta_c(2S).Comment: 5 page
Charm mass corrections to the bottomonium mass spectrum
The one-loop corrections to the bottomonium mass spectrum due to the finite
charm mass are evaluated in the framework of the relativistic quark model. The
obtained corrections are compared with the results of perturbative QCD.Comment: 6 pages, references added, version to be published in Phys. Rev.
Heavy quark potential and mass spectra of heavy mesons
The relativistic quark model is presented. The quark-antiquark potential for
the Schroedinger-like equation is constructed with the account of retardation
effects and one-loop radiative corrections. It consists of the one-gluon
exchange part and the confining part which is the mixture of the Lorentz scalar
and Lorentz vector contributions. The latter contains both the Dirac and Pauli
terms. In the v^2/c^2 approximation the mass spectra of heavy quarkonia
(charmonium and bottomonium) are calculated in good agreement with experiment.
In the case of heavy-light mesons (B and D) the light quark is treated
completely relativistically and only the expansion in the inverse heavy quark
mass is used. The mass spectra of the ground and excited states of D, D_s, B,
B_s mesons are calculated. They exhibit some features of the so-called ``level
inversion''. The obtained results are generally in accord with experimental
data. Still there exist some discrepancies between measurements of different
collaborations.Comment: 10 pages, plenary talk at the IXth International Conference on Hadron
Spectroscopy (August 25-September 1, 2001) - HADRON 2001, Protvino, Russi
Heavy quarkonium hyperfine structure and leptonic decays
The relation between the hyperfine structure and leptonic decay rates of
heavy quarkonia is considered with the account of relativistic and radiative
corrections. The calculated decay rates agree well with the available
experimental data, while the predicted eta_c(2S) mass is significantly smaller
than the value measured recently by the Belle and BaBar Collaborations.Comment: Invited talk at the XXIII Physics in Collisions Conference (PIC03),
Zeuthen, Germany, June 2003, 3 pages, LaTeX. PSN FRAP0
Hyperfine splitting and leptonic decay rates in heavy quarkonia
The hyperfine splitting in heavy quarkonia is considered in its relation to
the leptonic decay rates with the account of relativistic and radiative
corrections. The calculated decay rates agree well with the available
experimental data, while the predicted \eta_c(2S) mass is significantly smaller
than the value measured recently by the Belle Collaboration.Comment: 4 pages, misprint in Table 2 correcte
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