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A precise measurement of the Z resonance parameters through its hadronic decays

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A precise measurement of the Z resonance parameters through its hadronic decays

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dc.contributor.author	DELPHI Collaboration
dc.contributor.author	Allen, Paul
dc.contributor.author	Alted Abad, Francesc Josep
dc.contributor.author	Benlloch Baviera, José María
dc.contributor.author	Castillo Giménez, María Victoria
dc.contributor.author	Contreras González, José Luis
dc.contributor.author	Fez Laso, M. D. M. de
dc.contributor.author	Ferrer Soria, Antonio
dc.contributor.author	Fuster Verdú, Juan A.
dc.contributor.author	Hernández Rey, Juan José
dc.contributor.author	Higón Rodríguez, Emilio
dc.contributor.author	Llosá Reig, Rafael
dc.contributor.author	Lozano Bahilo, José Julio
dc.contributor.author	Sánchez Rojo, María Ester
dc.contributor.author	Sanchis Peris, Enrique
dc.contributor.author	Sebastiá Cortés, Angel
dc.contributor.author	Valls Ferrer, Juan Antonio
dc.contributor.author	Velasco González, Jorge
dc.contributor.author	Vela Buendía, Enrique
dc.contributor.author	Zúñiga Román, Juan
dc.date.accessioned	2016-05-27T10:23:54Z
dc.date.available	2016-05-27T10:23:54Z
dc.date.issued	1990
dc.identifier.citation	DELPHI Collaboration Allen, Paul Alted Abad, Francesc Josep Benlloch Baviera, José María Castillo Giménez, María Victoria Contreras González, José Luis Fez Laso, M. D. M. de Ferrer Soria, Antonio Fuster Verdú, Juan A. Hernández Rey, Juan José Higón Rodríguez, Emilio Llosá Reig, Rafael Lozano Bahilo, José Julio Sánchez Rojo, María Ester Sanchis Peris, Enrique Sebastiá Cortés, Angel Valls Ferrer, Juan Antonio Velasco González, Jorge Vela Buendía, Enrique Zúñiga Román, Juan 1990 A precise measurement of the Z resonance parameters through its hadronic decays Physics Letters B 241 3 435 448
dc.identifier.uri	http://hdl.handle.net/10550/53858
dc.description.abstract	A measurement of the cross section for e +e - --> hadrons using 11 000 hadronic decays of the Z boson at ten different center-of-mass energies is presented. A three-parameter fit gives the following values for the Z mass Mz, the total width Gammaz, the product of the electronic and hadronic partial widths GammaeGammah, and the unfolded pole cross section sigma 0: MZ=91.171±0.030(stat)±0.030 (beam) GeV, GammaZ=2.511±0.065 GeV, GammaeGammah=0.148±0.006 (stat.)±0.004 (syst.) GeV 2, sigma0=41.6±0.7(stat.)±1.1 (syst.) nb, Good agreement with the predictions of the standard model is observed. From a two-parameter fit the number of massless neutrino generations is found to be Nnu = 2.97±0.26. Thus the hypothesis of a fourth neutrino with mass less than 40 GeV is excluded with 95% confidence level. Combining the cross section measurements with the ratio {Gamma l}/{Gamma h} reported in another DELPHI paper [Phys. Lett. B 241 (1990) 425], the hadronic, leptonic and invisible widths are found to be Gammah=1741±61 MeV, Gammal=85.1±2.9 MeV, {Gamma h}/{Gamma l}=20.45±0.98 , Gammainv=515±54 MeV, in good agreement with the standard model.
dc.language.iso	eng
dc.relation.ispartof	Physics Letters B, 1990, vol. 241, num. 3, p. 435-448
dc.subject	Física nuclear
dc.title	A precise measurement of the Z resonance parameters through its hadronic decays
dc.type	journal article	es_ES
dc.date.updated	2016-05-27T10:23:55Z
dc.identifier.doi	10.1016/0370-2693(90)91668-2
dc.identifier.idgrec	070952
dc.rights.accessRights	open access	es_ES