Theoretical uncertainties on αsfrom event-shape variables in e+e−annihilations

2003/12/01 by Roger W. L. Jones, R. W. L. Jones, Matthew Ford +5 · 2 citations
Physics and Astronomy · #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ph

paper · pdf · doi:10.1088/1126-6708/2003/12/007

published as JHEP 0312 (2003) 007 · 34 pages, 13 figures

arxiv created 2003/12/01 · openalex publication_date 2003/12/04 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28

Abstract

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 alpha_s. This method evaluates the systematic uncertainty of the parameter alpha_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.

Citations

• Do the Quark Masses Run? Extractingm¯b(mZ)from CERN LEP Data
• Power corrections to event shape distributions
• A study of the energy evolution of event shape distributions and their means with the DELPHI detector at LEP

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