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

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arxiv hep-ph/0312016 v1 pith:D5TIMQMK submitted 2003-12-01 hep-ph

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

classification hep-ph
keywords uncertaintiestheoreticalalphadistributionsevent-shapemethodannihilationsperturbative
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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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.

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Cited by 4 Pith papers

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