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

R. W. L. Jones | Zendy; M. Ford | Zendy; Gavin P. Salam | Zendy; H. Stenzel | Zendy; Daniel Wicke | Zendy

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

Author(s) -

R. W. L. Jones,

M. Ford,

Gavin P. Salam,

H. Stenzel,

Daniel Wicke

Publication year - 2003

Publication title -

journal of high energy physics

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.998

H-Index - 261

eISSN - 1126-6708

pISSN - 1029-8479

DOI - 10.1088/1126-6708/2003/12/007

Subject(s) - event (particle physics) , observable , physics , hadron , basis (linear algebra) , deep inelastic scattering , statistical physics , jet (fluid) , coupling (piping) , particle physics , scattering , nuclear physics , inelastic scattering , mathematics , quantum mechanics , thermodynamics , geometry , mechanical engineering , engineering

The precision of measurements of the strong coupling constant usingevent-shape variables in e+e- annihilations is limited by theoreticalsystematic uncertainties. The uncertainties are related to missing higherorders in the perturbative predictions for the event-shape distributions. A newmethod is presented for the assessment of theoretical uncertainties in alpha_s.This method evaluates the systematic uncertainty of the parameter alpha_s fromthe uncertainty of the prediction for the distributions from which it isextracted. The perturbative uncertainties are calculated on a purelytheoretical basis, without accessing measured distributions. The method istherefore especially suited for an unbiased combination of results fromdifferent observables or experiments. It is universal and can be applied toother processes like jet production in deep-inelastic ep scattering or inhadron collisions.Comment: 34 pages, 13 figure

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