The R ratio in e+ e-, the determination of alpha(Mz^2) and a possible non-perturbative gluonic contribution

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dc.creatorMartin, A. D.
dc.creatorOuthwaite, J.
dc.creatorRyskin, M. G.
dc.date1999-12-06
dc.date.accessioned2026-07-07T10:53:16Z
dc.date.available2026-07-07T10:53:16Z
dc.descriptionWe review the determination of the QED coupling at the Z pole, which is a crucial parameter for electroweak theory. We include recent e+e- -> hadron data from Novosibirsk and Beijing to re-evaluate alpha (M_Z^2). We find 1/alpha (M_Z^2) = 128.973 +/- 0.035 or 128.934 +/- 0.040 according, respectively, to whether inclusive or exclusive e+e- -> hadron data are used in the interval 1.4 < \sqrt{s} < 2.1 GeV. The error is mainly due to uncertainties in the data in the low energy region, \sqrt{s} < 2.5 GeV. We find that no advantage is obtained by analytic continuation of the dispersion relation into the complex s plane. We show that the hints of structure for \sqrt{s} ~ 2.5 GeV may be evidence of a non-perturbative gluonic contribution to R(s).
dc.descriptionLaTeX, 7 pages, 2 eps figures, proceedings of the UK Phenomenology Workshop on Collider Physics, 19-24 September, Durham 1999, contribution to be published in J. Phys. G
dc.identifierhttps://arxiv.org/abs/hep-ph/9912252
dc.identifierhttp://arxiv.org/abs/hep-ph/9912252
dc.identifierJ.Phys.G26:600-606,2000
dc.identifierdoi:10.1088/0954-3899/26/5/313
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/185426
dc.subjectHigh Energy Physics - Phenomenology
dc.titleThe R ratio in e+ e-, the determination of alpha(Mz^2) and a possible non-perturbative gluonic contribution
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