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Determination of alpha(s) for b quarks at the Z0 resonance

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Determination of alpha(s) for b quarks at the Z0 resonance

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dc.contributor.author	DELPHI Collaboration
dc.contributor.author	Allen, Paul
dc.contributor.author	Chrin, J. T. M.
dc.contributor.author	Castillo Giménez, María Victoria
dc.contributor.author	Cortina Gil, Eduardo
dc.contributor.author	Ferrer Soria, Antonio
dc.contributor.author	Fuster Verdú, Juan A.
dc.contributor.author	Fez Laso, M. D. M. de
dc.contributor.author	Gómez Cadenas, Juan José
dc.contributor.author	García García, Carmen
dc.contributor.author	Hernández Rey, Juan José
dc.contributor.author	Higón Rodríguez, Emilio
dc.contributor.author	Lacasta Llácer, Carlos
dc.contributor.author	Lozano Bahilo, José Julio
dc.contributor.author	Martí García, Salvador
dc.contributor.author	Salt Cairols, José
dc.contributor.author	Valls Ferrer, Juan Antonio
dc.contributor.author	Zúñiga Román, Juan
dc.date.accessioned	2016-05-26T12:27:56Z
dc.date.available	2016-05-26T12:27:56Z
dc.date.issued	1993
dc.identifier.citation	DELPHI Collaboration Allen, Paul Chrin, J. T. M. Castillo Giménez, María Victoria Cortina Gil, Eduardo Ferrer Soria, Antonio Fuster Verdú, Juan A. Fez Laso, M. D. M. de Gómez Cadenas, Juan José García García, Carmen Hernández Rey, Juan José Higón Rodríguez, Emilio Lacasta Llácer, Carlos Lozano Bahilo, José Julio Martí García, Salvador Salt Cairols, José Valls Ferrer, Juan Antonio Zúñiga Román, Juan 1993 Determination of alpha(s) for b quarks at the Z0 resonance Physics Letters B 307 1-2 221 236
dc.identifier.uri	http://hdl.handle.net/10550/53830
dc.description.abstract	The strong coupling constant for b quarks has been determined, and its flavour independence, as predicted by QCD, investigated. The analysis involved events with lepton candidates selected from approximately 356 000 hadronic decays of the Z0, collected by the DELPHI detector at LEP in 1990 and 199 1. A method based on a direct comparison of the three-jet fraction in a b enriched sample, selected by requiring leptons with large momenta and transverse momenta, to that of the entire hadronic sample, illustrated the significant effect of the b quark mass on the multi-jet cross section, and verified the flavour independence of the strong coupling constant to an accuracy of +/- 6%. A second procedure based on a fit to the momentum and transverse momentum spectra of the lepton candidates in both two-jet and three (or more)-jet event samples simultaneously determined the b content in each, and, using second order QCD calculations, gave an absolute measurement of alpha(s) for b quarks of 0. 1 18 +/- 0.004 (stat.) +/- 0.003 (syst.) +/- 0.008 (scale). A comparison with a, for all quark flavours, as measured from the three-jet fraction in all hadronic events, further allowed the coupling strength for b quarks to be expressed in terms relative to that for udsc quarks, thereby cancelling certain common systematic uncertainties, and yielded alpha(s)b/alpha(s)udsc = 1.00 +/- 0.04 (stat.) +/- 0.03 (syst.).
dc.language.iso	eng
dc.relation.ispartof	Physics Letters B, 1993, vol. 307, num. 1-2, p. 221-236
dc.subject	Física nuclear
dc.title	Determination of alpha(s) for b quarks at the Z0 resonance
dc.type	journal article	es_ES
dc.date.updated	2016-05-26T12:27:57Z
dc.identifier.doi	10.1016/0370-2693(93)90213-2
dc.identifier.idgrec	070491
dc.rights.accessRights	open access	es_ES