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Searches for the heavy neutrinos from Z-decays

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Searches for the heavy neutrinos from Z-decays

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dc.contributor.author	DELPHI Collaboration
dc.contributor.author	Allen, Paul
dc.contributor.author	Benlloch Baviera, José María
dc.contributor.author	Castillo Giménez, María Victoria
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	García García, Carmen
dc.contributor.author	Gómez Cadenas, Juan José
dc.contributor.author	Hernández Rey, Juan José
dc.contributor.author	Higón Rodríguez, Emilio
dc.contributor.author	Lozano Bahilo, José Julio
dc.contributor.author	Lacasta Llácer, Carlos
dc.contributor.author	Martí García, Salvador
dc.contributor.author	Sánchez Rojo, María Ester
dc.contributor.author	Llosá Reig, Rafael
dc.contributor.author	Salt Cairols, José
dc.contributor.author	Valls Ferrer, Juan Antonio
dc.contributor.author	Zúñiga Román, Juan
dc.date.accessioned	2016-05-27T09:22:52Z
dc.date.available	2016-05-27T09:22:52Z
dc.date.issued	1992
dc.identifier.citation	DELPHI Collaboration Allen, Paul Benlloch Baviera, José María Castillo Giménez, María Victoria Fez Laso, M. D. M. de Ferrer Soria, Antonio Fuster Verdú, Juan A. García García, Carmen Gómez Cadenas, Juan José Hernández Rey, Juan José Higón Rodríguez, Emilio Lozano Bahilo, José Julio Lacasta Llácer, Carlos Martí García, Salvador Sánchez Rojo, María Ester Llosá Reig, Rafael Salt Cairols, José Valls Ferrer, Juan Antonio Zúñiga Román, Juan 1992 Searches for the heavy neutrinos from Z-decays Physics Letters B 274 2 230 238
dc.identifier.uri	http://hdl.handle.net/10550/53844
dc.description.abstract	We have searched for possible fourth family heavy neutrinos, pair produced in Z0 decays, in a sample of about 112 000 hadronic Z0 final states collected with the DELPHI detector. For all mixing matrix elements we exclude a new Dirac neutrino lighter than 44.5 GeV at a 95% confidence level, if the neutrino couples to the electron or muon family, and lighter than 44.0 GeV, if the neutrino couples to the tau family. Depending on the values of the mixing element and to which lepton family the neutrino couples, we obtain mass limits up to 46.2 GeV. For all mixing matrix elements we exclude a new Majorana neutrino lighter than 39.0 GeV, if it couples to the electron or the muon family, and lighter than 38.2 GeV, if it couples to the tau family. Depending on the values of the mixing matrix element and to which lepton family the neutrino couples, we obtain mass limits up to 44.7 GeV. We also exclude stable new Dirac neutrinos lighter than 45.0 GeV and new Majorana neutrinos lighter than 39.5 GeV.
dc.language.iso	eng
dc.relation.ispartof	Physics Letters B, 1992, vol. 274, num. 2, p. 230-238
dc.subject	Física nuclear
dc.title	Searches for the heavy neutrinos from Z-decays
dc.type	journal article	es_ES
dc.date.updated	2016-05-27T09:22:53Z
dc.identifier.doi	10.1016/0370-2693(92)90528-C
dc.identifier.idgrec	070947
dc.rights.accessRights	open access	es_ES