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Measurements of the lineshape of the Z(0) and determination of electroweak parameters from its hadronic and leptonic decays

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Measurements of the lineshape of the Z(0) and determination of electroweak parameters from its hadronic and leptonic decays

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dc.contributor.author	DELPHI Collaboration
dc.contributor.author	Ferrer Soria, Antonio
dc.contributor.author	Castillo Giménez, María Victoria
dc.contributor.author	Martí García, Salvador
dc.contributor.author	Cases Ruiz, Ramón
dc.contributor.author	Chrin, J. T. M.
dc.contributor.author	Cortina Gil, Eduardo
dc.contributor.author	Fez Laso, M. D. M. de
dc.contributor.author	Fuster Verdú, Juan A.
dc.contributor.author	García García, Carmen
dc.contributor.author	Gómez Cadenas, Juan José
dc.contributor.author	Hernando Morata, José Ángel
dc.contributor.author	Higón Rodríguez, Emilio
dc.contributor.author	Lacasta Llácer, Carlos
dc.contributor.author	Lozano Bahilo, José Julio
dc.contributor.author	Martínez Vidal, Fernando
dc.contributor.author	Salt Cairols, José
dc.contributor.author	Valls Ferrer, Juan Antonio
dc.contributor.author	Zúñiga Román, Juan
dc.contributor.author	Hernández Rey, Juan José
dc.date.accessioned	2014-09-03T10:22:03Z
dc.date.available	2014-09-03T10:22:03Z
dc.date.issued	1994
dc.identifier.citation	DELPHI Collaboration Ferrer Soria, Antonio Castillo Giménez, María Victoria Martí García, Salvador 1994 Measurements of the lineshape of the Z(0) and determination of electroweak parameters from its hadronic and leptonic decays Nuclear Physics B 417 1-2 3 57
dc.identifier.uri	http://hdl.handle.net/10550/37488
dc.description.abstract	During the LEP running periods in 1990 and 1991 DELPHI has accumulated approximately 450 000 Z 0 decays into hadrons and charged leptons. The increased event statistics coupled with improved analysis techniques and improved knowledge of the LEP beam energies permit significantly better measurements of the mass and width of the Z 0 resonance. Model independent fits to the cross sections and leptonic forward- backward asymmetries yield the following Z 0 parameters: the mass and total width MZ = 91.187 ± 0.009 GeV, ΓZ = 2.486 ± 0.012 GeV, the hadronicf and leptonic partials widths Γhad = 1.725 ± 0.012 GeV, Γℓ = 83.01 ± 0.52 MeV, the invisible width Γinv = 512 ± 10 MeV, the ratio of hadronic to leptonic partial widths Rℓ = 20.78 ± 0.15, and the Born level hadronic peak cross section σ0 = 40.90 ± 0.28 nb. Using these results and the value of αs determined from DELPHI data, the number of light neutrino species is determined to be 3.08 ± 0.05. The individual leptonic widths are found to be: Γe = 82.93 ± 0.70 MeV, Γμ = 83.20 ± 1.11 MeV and Γτ = 82.89 ± 1.31 MeV. Using the measured leptonic forward-backward asymmetries and assuming lepton universality, the squared vector and axial-vector couplings of the Z 0 to charged leptons are found to be gVℓ2 = (1.47 ± 0.51) × 10 -3 and gAℓ2 = 0.2483 ± 0.0016. A full Standard Model fit to the data yields a value of the top mass mt = 115 -82+52 (expt.) -24+52(Higgs) GeV, corresponding to a value of the weak mixing angle sin 2θefflept = 0.2339±0.0015 (expt.) -0.0004+0.0001 (Higgs). Values are obtained for the variables S and T, or ɛ1 and ɛ3 which parameterize electroweak loop effects.
dc.language.iso	eng
dc.relation.ispartof	Nuclear Physics B, 1994, vol. 417, num. 1-2, p. 3-57
dc.subject	Partícules (Física nuclear)
dc.subject	Detectors de radiació
dc.title	Measurements of the lineshape of the Z(0) and determination of electroweak parameters from its hadronic and leptonic decays
dc.type	journal article	es_ES
dc.date.updated	2014-09-03T10:22:03Z
dc.identifier.doi	10.1016/0550-3213(94)90537-1
dc.identifier.idgrec	074578
dc.rights.accessRights	open access	es_ES