Improved QCD expansion and the problem of determination of alpha_s and the condensates from the tau decays

Details Improved QCD expansion and the problem of determination of alpha_s and the condensates from the tau decays Improved QCD expansion and the problem of determination of alpha_s and the condensates from the tau decays

1997-09-17

arxiv.org/abs/hep-ph/9709377v1

Nucl.Phys.Proc.Suppl. 64 (1998) 356-359

Physics

High Energy Physics

High Energy Physics - Phenomenology

4 pages Latex, to appear in the Proceedings of the High Energy Physics International Euroconference on Quantum Chromodynamics,

Scientific paper

10.1016/S0920-5632(97)01088-8

The problem of determination of $\alpha_{s}$ and the condensates from the moments of invariant mass distribution in the semileptonic tau decays is considered. It is investigated how the extracted values of alpha_s(m^{2}_{tau}) and the condensates are affected by the the renormalization scheme dependence of the next-to-next-to-leading order perturbative corrections to the spectral moments. A simplified approach is used, in which the nonperturbative contributions are approximated by the terms of dimension six in the SVZ expansion, which arise from the four-quark condensates. \\

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