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Search for the t and b' quarks in hadronic decays of the Z0 boson

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Search for the t and b' quarks in hadronic decays of the Z0 boson

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DELPHI Collaboration; Allen, Paul; Alted Abad, Francesc Josep; Benlloch Baviera, José María; Castillo Giménez, María Victoria Perfil; Fez Laso, M. D. M. de; Ferrer Soria, Antonio Perfil; Fuster Verdú, Juan A. Perfil; Hernández Rey, Juan José Perfil; Higón Rodríguez, Emilio Perfil; Lozano Bahilo, José Julio; Sánchez Rojo, María Ester; Sánchez Martínez, Javier; Sanchis Peris, Enrique; Sebastiá Cortés, Angel; Llosá Reig, Rafael; Valls Ferrer, Juan Antonio; Velasco González, Jorge; Vela Buendía, Enrique; Zúñiga Román, Juan

This document is a artículoDate1990

Este documento está disponible también en : http://hdl.handle.net/10550/53678

We present a search for the third generation up type quark t and a possible fourth down type quark b' in hadronic Z 0 decays observed in DELPHI at the LEP collider. For any scenario with a decay through the charged current or into a charged Higgs with a mass at least 6 GeV/ c 2 below the t and 3 GeV c 2 below the b' mass, we set a lower limit for the t quark mass at 44.0 GeV/ c 2 and for the b' mass at 44.5 GeV/ c 2 . For specific scenarios the mass limits are slightly higher, e.g. for charged current decays the limits are 44.5 and 45.0 GeV/ c 2 respectively, where all limits are given at a 95% confidence level.

DELPHI Collaboration Allen, Paul Alted Abad, Francesc Josep Benlloch Baviera, José María Castillo Giménez, María Victoria Fez Laso, M. D. M. de Ferrer Soria, Antonio Fuster Verdú, Juan A. Hernández Rey, Juan José Higón Rodríguez, Emilio Lozano Bahilo, José Julio Sánchez Rojo, María Ester Sánchez Martínez, Javier Sanchis Peris, Enrique Sebastiá Cortés, Angel Llosá Reig, Rafael Valls Ferrer, Juan Antonio Velasco González, Jorge Vela, E. Zúñiga Román, Juan 1990 Search for the t and b' quarks in hadronic decays of the Z0 boson Physics Letters B 242 3-4 536 546

http://dx.doi.org/10.1016/0370-2693(90)91808-O