Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2001-01-27
Phys.Lett.B513:381-390,2001
Physics
High Energy Physics
High Energy Physics - Phenomenology
12 pages, 2 figures; Discussion on ultra-soft effects included; Some conservative error estimates added; Version to appear in
Scientific paper
10.1016/S0370-2693(01)00611-6
We study the energy spectrum of bottomonium in perturbative QCD, taking alpha_s(Mz)=0.1181 +/- 0.0020 as input and fixing m_b^{MSbar}(m_b^{MSbar}) on the Upsilon(1S) mass. Contrary to wide beliefs, perturbative QCD reproduces reasonably well the gross structure of the spectrum as long as the coupling constant remains smaller than one. We perform a detailed analysis and discuss the size of non-perturbative effects. A new qualitative picture on the structure of the bottomonium spectrum is provided. The lowest-lying (c,cbar) and (b,cbar) states are also examined.
Brambilla Nora
Sumino Yoshio
Vairo Antonio
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