Contribution from Duality Violations to the theoretical error on alpha_s

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dc.creatorCata, O.
dc.creatorGolterman, M.
dc.creatorPeris, S.
dc.date2009-04-28
dc.date.accessioned2026-07-07T13:11:13Z
dc.date.available2026-07-07T13:11:13Z
dc.descriptionDuality Violations (DVs) is a nickname for the failure of the Operator Product Expansion to describe QCD correlators on the physical axis. Using a physically motivated ansatz, a fit to the spectral functions allows us to get a quantitative estimate for the amount of DVs present in tau data. The quality of the fit turns out to be better than expected. Since DVs have not been included in the past in the determination of alpha_s, they amount to an additional theoretical error which we estimate could be δalpha_s(m_{tau}) \sim 0.003-0.010 . Our ansatz satisfies, in particular, the 1st Weinberg sum rule, which shows that this sum rule is not enough to force DVs to vanish.
dc.description7 pages, 3 figures. Contribution to the proceedings of the Int. Workshop on Effective Field Theories: from the pion to the upsilon. Feb. 2009. Valencia, Spain
dc.identifierhttps://arxiv.org/abs/0904.4443
dc.identifierhttp://arxiv.org/abs/0904.4443
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/229221
dc.subjectHigh Energy Physics - Phenomenology
dc.subjectHigh Energy Physics - Lattice
dc.subjectNuclear Theory
dc.titleContribution from Duality Violations to the theoretical error on alpha_s
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