Third-order Coulomb corrections to the S-wave Green function, energy levels and wave functions at the origin

Abstract

We obtain analytic expressions for the third-order corrections due to the strong interaction Coulomb potential to the S-wave Green function, energy levels and wave functions at the origin for arbitrary principal quantum number n. Together with the known non-Coulomb correction this results in the complete spectrum of S-states up to order alpha_s^5. The numerical impact of these corrections on the Upsilon spectrum and the top quark pair production cross section near threshold is estimated.

24 pages, LaTeX, v2: eq.(30) corrected (-13/8->-15/8)

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