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Theoretical uncertainties on alpha_s from event-shape variables in e+e? annihilations.

Research output: Contribution to Journal/MagazineJournal articlepeer-review

<mark>Journal publication date</mark>1/12/2003
<mark>Journal</mark>Journal of High Energy Physics
Issue number12
Number of pages31
Pages (from-to)7-37
Publication StatusPublished
<mark>Original language</mark>English


The precision of measurements of the strong coupling constant using event-shape variables in e +e- annihilations is limited by theoretical systematic uncertainties. The uncertainties are related to missing higher orders in the perturbative predictions for the event-shape distributions. A new method is presented for the assessment of theoretical uncertainties in α s . This method evaluates the systematic uncertainty of the parameter α s from the uncertainty of the prediction for the distributions from which it is extracted. The perturbative uncertainties are calculated on a purely theoretical basis, without accessing measured distributions. The method is therefore especially suited for an unbiased combination of results from different observables or experiments. It is universal and can be applied to other processes like jet production in deep-inelastic ep scattering or in hadron collisions.

Bibliographic note

Jones led the analysis group and was chief author of the paper. This has set the method for subsequent systematic uncertainty determinations; it is referenced beyond the e+e- community. 29 citations (SPIRES). RAE_import_type : Journal article RAE_uoa_type : Physics