Strange Quark Mass from Tau Lepton Decays with O(alpha_s^3) Accuracy

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dc.creatorBaikov, P. A.
dc.creatorChetyrkin, K. G.
dc.creatorKühn, J. H.
dc.date2004-12-22
dc.date2005-05-18
dc.date.accessioned2026-07-07T11:04:42Z
dc.date.available2026-07-07T11:04:42Z
dc.descriptionThe first complete calculation of the quadratic quark mass correction to the correlator of the two currents relevant for the strangeness-changing semihadronic tau-decay rate is presented including its real part at the four-loop level. This allows to perform the extraction of the strange quark mass m_s from the decay width of the tau-lepton with full O(alpha_s^3) accuracy. In agreement with previous estimates the newly computed alpha_s^3 term proves to be rather large. This justifies inclusion of the similarly estimated alpha_s^4 term in phenomenological analysis. Combined with an updated value of V_{us} and an ``'improved'' version of the renormalization group improvement of the perturbative series this leads to an increase of the central value of m_s by about 20 % and a partial reduction of the theoretical uncertainty by about 50 %.
dc.description4 pages. References updated. The final version accepted for publication in Physical Review Letters. The complete paper is also available via the www at http://www-ttp.physik.uni-karlsruhe.de/Preprints/
dc.identifierhttps://arxiv.org/abs/hep-ph/0412350
dc.identifierhttp://arxiv.org/abs/hep-ph/0412350
dc.identifierPhys.Rev.Lett.95:012003,2005
dc.identifierdoi:10.1103/PhysRevLett.95.012003
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/188981
dc.subjectHigh Energy Physics - Phenomenology
dc.titleStrange Quark Mass from Tau Lepton Decays with O(alpha_s^3) Accuracy
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