A precise determination of alpha_s from LEP thrust data using effective field theory

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dc.creatorBecher, Thomas
dc.creatorSchwartz, Matthew D.
dc.date2008-03-04
dc.date2008-07-03
dc.date.accessioned2026-07-07T12:24:10Z
dc.date.available2026-07-07T12:24:10Z
dc.descriptionStarting from a factorization theorem in Soft-Collinear Effective Theory, the thrust distribution in e+e- collisions is calculated including resummation of the next-to-next-to-next-to leading logarithms. This is a significant improvement over previous calculations which were only valid to next-to-leading logarithmic order. The fixed-order expansion of the resummed result approaches the exact fixed-order distribution towards the kinematic endpoint. This close agreement provides a verification of both the effective field theory expression and recently completed next-to-next-to-leading fixed order event shapes. The resummed distribution is then matched to fixed order, resulting in a distribution valid over a large range of thrust. A fit to ALEPH and OPAL data from LEP 1 and LEP 2 produces alpha_s(m_Z)= 0.1172 +/- 0.0010 +/- 0.0008 +/-0.0012 +/- 0.0012, where the uncertainties are respectively statistical, systematic, hadronic, and perturbative. This is one of the world's most precise extractions of alpha_s to date.
dc.description37 pages, 12 figures; v2: hadronization discussion and appendices expanded
dc.identifierhttps://arxiv.org/abs/0803.0342
dc.identifierhttp://arxiv.org/abs/0803.0342
dc.identifierJHEP 0807:034,2008
dc.identifierdoi:10.1088/1126-6708/2008/07/034
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/214237
dc.subjectHigh Energy Physics - Phenomenology
dc.titleA precise determination of alpha_s from LEP thrust data using effective field theory
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