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A Study of radiactive muon-pair events at Z° energies and limits on an additional Z' gauge boson

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A Study of radiactive muon-pair events at Z° energies and limits on an additional Z' gauge boson

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dc.contributor.author	DELPHI Collaboration
dc.contributor.author	Castillo Giménez, María Victoria
dc.contributor.author	Ferrer Soria, Antonio
dc.contributor.author	Cases Ruiz, Ramón
dc.contributor.author	Higón Rodríguez, Emilio
dc.contributor.author	Chrin, J. T. M.
dc.contributor.author	Cortina Gil, Eduardo
dc.contributor.author	Ferrer Soria, Antonio
dc.contributor.author	Fuster Verdú, Juan A.
dc.contributor.author	García García, Carmen
dc.contributor.author	Gómez Cadenas, Juan José
dc.contributor.author	Hernández Rey, Juan José
dc.contributor.author	Hernando Morata, José Ángel
dc.contributor.author	Lacasta Llácer, Carlos
dc.contributor.author	Lozano Bahilo, José Julio
dc.contributor.author	Martínez Vidal, Fernando
dc.contributor.author	Martí García, Salvador
dc.contributor.author	Navas Concha, Sergio
dc.contributor.author	Salt Cairols, José
dc.contributor.author	Valls Ferrer, Juan Antonio
dc.date.accessioned	2014-05-08T11:33:11Z
dc.date.available	2014-05-08T11:33:11Z
dc.date.issued	1995
dc.identifier.citation	DELPHI Collaboration (Abreu, P. Castillo Giménez, María Victoria Ferrer Soria, Antonio Cases Ruiz, Manuel Ramón Higón Rodríguez, Emilio 1995 A Study of radiactive muon-pair events at Z° energies and limits on an additional Z' gauge boson. Zeitschrift für Physik C-Particles and Fields 65 603 618
dc.identifier.uri	http://hdl.handle.net/10550/35002
dc.description.abstract	An analysis is reported on the channele + e −→μ+μ−(nγ), n=1,2..., using data taken with the DELPHI detector at LEP from 1990 to 1992. Differential cross sections of the radiative photons as a function of photon energy and of the angle between the photon and the muon are presented. No significant deviations from expectations are observed. The data are also used to extract the muon-pair cross section and asymmetry below the Z0 peak by using those events with relatively hard initial state radiative photon(s). The measured cross section and asymmetry show no significant deviation from the Standard Model expectations. These results together with the DELPHI cross section and asymmetry measurements at the LEP energies from the 1990 to 1992 running periods are used to determine limits on the Z0-Z′ gauge boson mixing angle θZ′ and on the Z′ mass. There is no indication of the existence of a Z′; the limits obtained on the mixing angle substantially improve upon existing limits. The 95% confidence level allowed ranges of θZ′ in various models are: −0.0070⩽θZ′⩽0.0078,E6(χ)model,−0.0075⩽θZ′⩽0.0095,E6(ψ)model,−0.029⩽θZ′⩽0.029,E6(η)model,−0.0068⩽θZ′⩽0.0082,L−R(1.)model,−0.0057⩽θZ′⩽0.0077,L−R(2√)model.
dc.relation.ispartof	Zeitschrift für Physik C-Particles and Fields, 1995, vol. 65, p. 603-618
dc.subject	Partícules (Física nuclear)
dc.subject	Detectors de radiació
dc.title	A Study of radiactive muon-pair events at Z° energies and limits on an additional Z' gauge boson
dc.type	journal article	es_ES
dc.date.updated	2014-05-08T11:33:12Z
dc.identifier.doi	10.1007/BF01578669
dc.identifier.idgrec	006566
dc.rights.accessRights	open access	es_ES
dc.identifier.url	10.1007/BF01578669