Disentangling perturbative and power corrections in precision tau decay analysis - INSPIRE

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Disentangling perturbative and power corrections in precision tau decay analysis

D.S. Gorbunov
(
- Moscow, INR
)
,
A.A. Pivovarov
(
- Moscow, INR
)

Oct, 2004

6 pages

Published in:

Phys.Rev.D 71 (2005) 013002

e-Print:

hep-ph/0410196 [hep-ph]

DOI:

10.1103/PhysRevD.71.013002

PDG:

{\mathit {\mathit s}}

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Abstract: (arXiv)

Hadronic tau decay precision data are analyzed with account of both perturbative and power corrections of high orders within QCD. It is found that contributions of high order power corrections are essential for extracting a numerical value for the strange quark mass from the data on Cabibbo suppressed tau decays. We show that with inclusion of new five-loop perturbative corrections in the analysis the convergence of perturbation theory remains acceptable only for few low order moments. We obtain m_s(M_\tau) =130\pm 27 MeV in agreement with previous estimates.

13.35.Dx
14.60.Fg
12.15.Lk
tau: hadronic decay
tau: width
differential cross section
moment
quark: strangeness
quark: mass
quantum chromodynamics: perturbation theory

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