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DELPHI Collaboration; Alemany Fernández, Reyes; Cabrera Urbán, Susana; Castillo Giménez, María Victoria; Cortina Gil, Eduardo; Ferrer Soria, Antonio; Fuster Verdú, Juan A.; García García, Carmen; Gil Botella, Inés; Hernández Rey, Juan José; Higón Rodríguez, Emilio; Martínez Vidal, Fernando; Navas Concha, Sergio; Salt Cairols, José | |||
Aquest document és un/a article, creat/da en: 1999 | |||
Este documento está disponible también en : 10.1007/s100529901074 |
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A search for unstable heavy fermions with the DELPHI detector at LEP is reported. Sequential and non-canonical leptons, as well as excited leptons and quarks, are considered. The data analysed correspond to an integrated luminosity of about 48 pb^{-1} at an e^+e^- centre-of-mass energy of 183 GeV and about 20 pb^{-1} equally shared between the centre-of-mass energies of 172 GeV and 161 GeV. The search for pair-produced new leptons establishes 95% confidence level mass limits in the region between 70 GeV/c^2 and 90 GeV/c^2, depending on the channel. The search for singly produced excited leptons and quarks establishes upper limits on the ratio of the coupling of the excited fermion. | |||
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