A SEARCH FOR NEW QUARKS AND LEPTONS FROM Z ° DECAY AT LEP ALEPH Collaboration

A SEARCH FOR NEW QUARKS AND LEPTONS FROM Z ° DECAY AT LEP ALEPH Collaboration

A search for Z0 decays into pairs of possible new heavy quarks (t and b′), new heavy charged leptons (L±), stable heavy neutral leptons (νL) and unstable heavy neutral leptons (L0) is performed on data collected by the ALEPH detector corresponding to 11 550 events of Z0→hadrons. The limits on the ma...

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Veröffentlicht in:Physics letters. B 1990-03, Vol.236 (4), p.511-522
Hauptverfasser: Decamp, D, Deschizeaux, B, Lees, J.-P, Minard, M.-N, Delfino, M, Fernandez, E, Martinez, M, Miquel, R, Orteu, S, Pacheco, A, Tubau, E, De, M, Farilla, A, Iaselli, G, Maggi, G, Natali, S, Nuzzo, S, Ranieri, A, Raso, G, Romano, F, Ruggieri, F, Selvaggi, G, Silvestris, L, Tempesta, P, Zito, G, Hu, H, Huang, D, Lin, J, Ruan, T, Wang, T, Wu, W, Xie, Y, Xu, D, Xu, R, Zhang, J, Zhao, W, Albrecht, H, Bird, F, Blucher, E, Charity, T, Drevermann, H, Garrido, L1, Grab, C, Hagelberg, R, Haywood, S, Jost, B, Kasemann, M, Kellner, G, Knobloch, J, Lacourt, A, Lehraus, I, Lohse, T, Loke, D, Marchioro, A, Mato, P, May, J, Minten, A, Miotto, A, Palazzi, P, Pepe-Altarelli, M, Ranjard, F, Roth, Andrea, Rothberg, J, Rotscheidt, H, Schlatter, D, Takashima, M, Talby, M., Taureg, H, Tejessy, W, Wachsmuth, H, Wheeler, S, Wiedenmann, W, Witzeling, W, Wotschack, J, Henrard, Pierre, Perret, P., Ajaltouni, Ziad Zj, Falvard, Alain, Bardadin-Otwinowska, M., Gay, Pascal, Jousset, J., Michel, B., Montret, Jean-Claude, Pallin, D., Proriol, Joseph, Prulhiere, F., J., Badier, A., Blondel, G., Bonneaud, J., Bourotte, F., Braems, J.C., Brient, M.A., Ciocci, G., Fouque, R., Guirlet, A., Rougé, M., Rumpf, R., Tanaka, H., Videau, Videau, I
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Sprache:eng
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High Energy Physics - Experiment
Physics
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Zusammenfassung:A search for Z0 decays into pairs of possible new heavy quarks (t and b′), new heavy charged leptons (L±), stable heavy neutral leptons (νL) and unstable heavy neutral leptons (L0) is performed on data collected by the ALEPH detector corresponding to 11 550 events of Z0→hadrons. The limits on the masses of the heavy quarks are Mt > 45.8 GeV and Mb′ > 46.0 GeV, allowing for both charged-current and flavor-changing neutral-current decays of the b′. If an L± decays into a stable νL, then for MνL MνL. Finally, while the mass of the stable νL is excluded up to 42.7 GeV, the mass of the unstable L0 is excluded up to 45.7 GeV with the mixing parameters |UℓL0|2 down to 10−13 at this mass. For 25.0 GeV < ML0 < 42.7 GeV, all values of |UℓL0|2 are excluded. All limits are given at 95% CL.
ISSN:0370-2693
DOI:10.1016/0370-2693(90)90392-J