6533b82efe1ef96bd1293a4b

RESEARCH PRODUCT

Determination of alpha-s in second order QCD from hadronic Z decays

Delphi CollaborationPaul AllenMaría Victoria Castillo GiménezM. D. M. De Fez LasoAntonio Ferrer SoriaJuan A. Fuster VerdúCarmen García GarcíaJuan José Gómez CadenasJuan José Hernández ReyEmilio Higón RodríguezJosé Julio Lozano BahiloCarlos Lacasta LlácerSalvador Martí GarcíaJosé Salt CairolsMaría Ester Sánchez RojoJuan Antonio Valls FerrerJuan Zúñiga Román

subject

High Energy Physics::PhenomenologyHigh Energy Physics::ExperimentFísica nuclear

description

Distributions of event shape variables obtained from 120600 hadronic Z decays measured with the DELPHI detector are compared to the predictions of QCD based event generators. Values of the strong coupling constant alpha(s) are derived as a function of the renormalization scale from a quantitative analysis of eight hadronic distributions. The final result, alpha(s) (M(Z)) = 0.113 +/- 0.007, is based on second order perturbation theory and uses two hadronization corrections, one computed with a parton shower model and the other with a QCD matrix element model.

yearjournalcountryeditionlanguage
1992-01-01
10.1007/bf01881708http://hdl.handle.net/10550/53842