A search for new quarks and leptons from Z0 decay at LEP

D. Decamp; B. Deschizeaux; J. P. Lees; M. N. Minard; J. M. Crespo; M. Delfino; E. Fernandez; M. Martinez; R. Miquel; Ll M. Mir; S. Orteu; A. Pacheco; J. A. Perlas; E. Tubau; M. G. Catanesi; M. De Palma; A. Farilla; G. Iaselli; G. Maggi; S. Natali; S. Nuzzo; A. Ranieri; G. Raso; F. Romano; F. Ruggieri; G. Selvaggi; L. Silvestris; P. Tempesta; G. Zito; H. Hu; D. Huang; J. Lin; T. Ruan; T. Wang; W. Wu; Y. Xie; D. Xu; R. Xu; J. Zhang; W. Zhao; H. Albrecht; W. B. Atwood; F. Bird; E. Blucher; T. H. Burnett; T. Charity; H. Drevermann; Ll Garrido; C. Grab; R. Hagelberg; S. Haywood; B. Jost; M. Kasemann; G. Kellner; J. Knobloch; A. Lacourt; I. Lehraus; T. Lohse; D. Lüke; A. Marchioro; P. Mato; J. May; A. Minten; A. Miotto; P. Palazzi; M. Pepe-Altarelli; F. Ranjard; A. Roth; J. Rothberg; H. Rotscheidt; W. Von Rüden; R. St. Denis; D. Schlatter; M. Takashima; M. Talby; H. Taureg; W. Tejessy; H. Wachsmuth; S. Wheeler; W. Wiedenmann; W. Witzeling; J. Wotschack; Z. Ajaltouni; M. Bardadin-Otwinowska; A. Falvard; P. Gay; P. Henrard; J. Jousset; B. Michel; J. C. Montret; D. Pallin; P. Perret; J. Proriol; F. Prulhière; J. D. Hansen; J. R. Hansen; P. H. Hansen; R. Møllerud; G. Petersen; E. Simopoulou; A. Vayaki; 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; I. Videau; D. J. Candlin; A. Conti; G. Parrini; M. Corden; C. Georgiopoulos; J. H. Goldman; M. Ikeda; J. Lannutti; D. Levinthal; M. Mermikides; L. Sawyer; G. Stimpfl; A. Antonelli; R. Baldini; G. Bencivenni; G. Bologna; F. Bossi; P. Campana; G. Capon; V. Chiarella; G. De Ninno; B. D'Ettorre-Piazzoli; G. Felici; P. Laurelli; G. Mannocchi; F. Murtas; G. P. Murtas; G. Nicoletti; P. Picchi; P. Zografou; B. Altoon; O. Boyle; A. W. Halley; I. Ten Have; J. L. Hearns; I. S. Hughes; J. G. Lynch; W. T. Morton; C. Raine; J. M. Scarr; K. Smith; A. S. Thompson; B. Brandl; O. Braun; R. Geiges; C. Geweniger; P. Hanke; V. Hepp; E. E. Kluge; Y. Maumary; M. Panter; A. Putzer; B. Rensch; A. Stahl; K. Tittel; M. Wunsch; A. T. Belk; R. Beuselinck; D. M. Binnie; W. Cameron; M. Cattaneo; P. J. Dornan; S. Dugeay; R. W. Forty; A. M. Greene; J. F. Hassard; S. J. Patton; J. K. Sedgbeer; G. Taylor; I. R. Tomalin; A. G. Wright; P. Girtler; D. Kuhn; G. Rudolph; C. K. Bowdery; T. J. Brodbeck; A. J. Finch; F. Foster; G. Hughes; N. R. Keemer; M. Nuttall; B. S. Rowlingson; T. Sloan; S. W. Snow; T. Barczewski; L. A.T. Bauerdick; K. Kleinknecht; B. Renk; S. Roehn; H. G. Sander; M. Schmelling; F. Steeg; J. P. Albanese; J. J. Aubert; C. Benchouk; A. Bonissent; D. Courvoisier; F. Etienne; E. Matsinos; S. Papalexiou; P. Payre; B. Pietrzyk; Z. Qian; W. Blum; P. Cattaneo; G. Cowan; B. Dehning; H. Dietl; M. Fernandez-Bosman; D. Hauff; A. Jahn; E. Lange; G. Lütjens; G. Lutz; W. Männer; H. G. Moser; Y. Pan; R. Richter; A. S. Schwarz; R. Settles; U. Stiegler; U. Stierlin; J. Thomas; G. Waltermann; V. Bertin; G. De Bouard; J. Boucrot; O. Callot; X. Chen; A. Cordier; M. Davier; G. Ganis; J. F. Grivaz; Ph Heusse; P. Janot; V. Journé; D. W. Kim; J. Lefrançois; A. M. Lutz; J. J. Veillet; F. Zomer; S. R. Amendolia; G. Bagliesi; G. Batignani; L. Bosisio; U. Bottigli; C. Bradaschia; I. Ferrante; F. Fidecaro; L. Foà; E. Focardi; F. Forti; A. Giassi; M. A. Giorgi; F. Ligabue; A. Lusiani; E. B. Mannelli; P. S. Marrocchesi; A. Messineo; F. Palla; G. Sanguinetti; S. Scapellato; J. Steinberger; R. Tenchini; G. Tonelli; G. Triggiani; J. M. Carter; M. G. Green; P. V. March; T. Medcalf; M. R. Saich; J. A. Strong; R. M. Thomas; T. Wildish; D. R. Botterill; R. W. Clifft; T. R. Edgecock; M. Edwards; S. M. Fisher; J. Harvey; T. J. Jones; P. R. Norton; D. P. Salmon; J. C. Thompson; E. Aubourg; B. Bloch-Devaux; P. Colas; C. Klopfenstein; E. Lançon; E. Locci; S. Loucatos; L. Mirabito; E. Monnier; P. Perez; F. Perrier; J. Rander; J. F. Renardy; A. Roussarie; J. P. Schuller; J. G. Ashman; C. N. Booth; F. Combley; M. Dinsdale; J. Martin; D. Parker; L. F. Thompson; S. Brandt; H. Burkhardt; C. Grupen; H. Meinhard; E. Neugebauer; U. Schäfer; H. Seywerd; B. Gobbo; F. Liello; E. Milotti; F. Ragusa; L. Rolandi; L. Bellantoni; J. F. Boudreau; D. Cinabro; J. S. Conway; D. F. Cowen; Z. Feng; J. L. Harton; J. Hilgart; R. C. Jared; R. P. Johnson; B. W. Leclaire; Y. B. Pan; T. Parker; J. R. Pater; Y. Saadi; V. Sharma; J. A. Wear; F. V. Weber; Lan Wu Sau Lan Wu; S. T. Xue; G. Zobernig

doi:10.1016/0370-2693(90)90392-J

A search for new quarks and leptons from Z⁰ decay at LEP

D. Decamp, B. Deschizeaux, J. P. Lees, M. N. Minard, J. M. Crespo, M. Delfino, E. Fernandez, M. Martinez, R. Miquel, Ll M. Mir, S. Orteu, A. Pacheco, J. A. Perlas, E. Tubau, M. G. Catanesi, M. De Palma, A. Farilla, G. Iaselli, G. Maggi, S. NataliS. Nuzzo, A. Ranieri, G. Raso, F. Romano, F. Ruggieri, G. Selvaggi, L. Silvestris, P. Tempesta, G. Zito, H. Hu, D. Huang, J. Lin, T. Ruan, T. Wang, W. Wu, Y. Xie, D. Xu, R. Xu, J. Zhang, W. Zhao, H. Albrecht, W. B. Atwood, F. Bird, E. Blucher, T. H. Burnett, T. Charity, H. Drevermann, Ll Garrido, C. Grab, R. Hagelberg, S. Haywood, B. Jost, M. Kasemann, G. Kellner, J. Knobloch, A. Lacourt, I. Lehraus, T. Lohse, D. Lüke, A. Marchioro, P. Mato, J. May, A. Minten, A. Miotto, P. Palazzi, M. Pepe-Altarelli, F. Ranjard, A. Roth, J. Rothberg, H. Rotscheidt, W. Von Rüden, R. St. Denis, D. Schlatter, M. Takashima, M. Talby, H. Taureg, W. Tejessy, H. Wachsmuth, S. Wheeler, W. Wiedenmann, W. Witzeling, J. Wotschack, Z. Ajaltouni, M. Bardadin-Otwinowska, A. Falvard, P. Gay, P. Henrard, J. Jousset, B. Michel, J. C. Montret, D. Pallin, P. Perret, J. Proriol, F. Prulhière, J. D. Hansen, J. R. Hansen, P. H. Hansen, R. Møllerud, G. Petersen, E. Simopoulou, A. Vayaki, 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, I. Videau, D. J. Candlin, A. Conti, G. Parrini, M. Corden, C. Georgiopoulos, J. H. Goldman, M. Ikeda, J. Lannutti, D. Levinthal, M. Mermikides, L. Sawyer, G. Stimpfl, A. Antonelli, R. Baldini, G. Bencivenni, G. Bologna, F. Bossi, P. Campana, G. Capon, V. Chiarella, G. De Ninno, B. D'Ettorre-Piazzoli, G. Felici, P. Laurelli, G. Mannocchi, F. Murtas, G. P. Murtas, G. Nicoletti, P. Picchi, P. Zografou, B. Altoon, O. Boyle, A. W. Halley, I. Ten Have, J. L. Hearns, I. S. Hughes, J. G. Lynch, W. T. Morton, C. Raine, J. M. Scarr, K. Smith, A. S. Thompson, B. Brandl, O. Braun, R. Geiges, C. Geweniger, P. Hanke, V. Hepp, E. E. Kluge, Y. Maumary, M. Panter, A. Putzer, B. Rensch, A. Stahl, K. Tittel, M. Wunsch, A. T. Belk, R. Beuselinck, D. M. Binnie, W. Cameron, M. Cattaneo, P. J. Dornan, S. Dugeay, R. W. Forty, A. M. Greene, J. F. Hassard, S. J. Patton, J. K. Sedgbeer, G. Taylor, I. R. Tomalin, A. G. Wright, P. Girtler, D. Kuhn, G. Rudolph, C. K. Bowdery, T. J. Brodbeck, A. J. Finch, F. Foster, G. Hughes, N. R. Keemer, M. Nuttall, B. S. Rowlingson, T. Sloan, S. W. Snow, T. Barczewski, L. A.T. Bauerdick, K. Kleinknecht, B. Renk, S. Roehn, H. G. Sander, M. Schmelling, F. Steeg, J. P. Albanese, J. J. Aubert, C. Benchouk, A. Bonissent, D. Courvoisier, F. Etienne, E. Matsinos, S. Papalexiou, P. Payre, B. Pietrzyk, Z. Qian, W. Blum, P. Cattaneo, G. Cowan, B. Dehning, H. Dietl, M. Fernandez-Bosman, D. Hauff, A. Jahn, E. Lange, G. Lütjens, G. Lutz, W. Männer, H. G. Moser, Y. Pan, R. Richter, A. S. Schwarz, R. Settles, U. Stiegler, U. Stierlin, J. Thomas, G. Waltermann, V. Bertin, G. De Bouard, J. Boucrot, O. Callot, X. Chen, A. Cordier, M. Davier, G. Ganis, J. F. Grivaz, Ph Heusse, P. Janot, V. Journé, D. W. Kim, J. Lefrançois, A. M. Lutz, J. J. Veillet, F. Zomer, S. R. Amendolia, G. Bagliesi, G. Batignani, L. Bosisio, U. Bottigli, C. Bradaschia, I. Ferrante, F. Fidecaro, L. Foà, E. Focardi, F. Forti, A. Giassi, M. A. Giorgi, F. Ligabue, A. Lusiani, E. B. Mannelli, P. S. Marrocchesi, A. Messineo, F. Palla, G. Sanguinetti, S. Scapellato, J. Steinberger, R. Tenchini, G. Tonelli, G. Triggiani, J. M. Carter, M. G. Green, P. V. March, T. Medcalf, M. R. Saich, J. A. Strong, R. M. Thomas, T. Wildish, D. R. Botterill, R. W. Clifft, T. R. Edgecock, M. Edwards, S. M. Fisher, J. Harvey, T. J. Jones, P. R. Norton, D. P. Salmon, J. C. Thompson, E. Aubourg, B. Bloch-Devaux, P. Colas, C. Klopfenstein, E. Lançon, E. Locci, S. Loucatos, L. Mirabito, E. Monnier, P. Perez, F. Perrier, J. Rander, J. F. Renardy, A. Roussarie, J. P. Schuller, J. G. Ashman, C. N. Booth, F. Combley, M. Dinsdale, J. Martin, D. Parker, L. F. Thompson, S. Brandt, H. Burkhardt, C. Grupen, H. Meinhard, E. Neugebauer, U. Schäfer, H. Seywerd, B. Gobbo, F. Liello, E. Milotti, F. Ragusa, L. Rolandi, L. Bellantoni, J. F. Boudreau, D. Cinabro, J. S. Conway, D. F. Cowen, Z. Feng, J. L. Harton, J. Hilgart, R. C. Jared, R. P. Johnson, B. W. Leclaire, Y. B. Pan, T. Parker, J. R. Pater, Y. Saadi, V. Sharma, J. A. Wear, F. V. Weber, Lan Wu Sau Lan Wu, S. T. Xue, G. Zobernig

Research output: Contribution to journal › Article › peer-review

76 Scopus citations

Abstract

A search for Z⁰ decays into pairs of possible new heavy quarks (t and b′), new heavy charged leptons (L^±), stable heavy neutral leptons (ν_L) 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 M_t > 45.8 GeV and M_b′ > 46.0 GeV, allowing for both charged-current and flavor-changing neutral-current decays of the b′. If an L^± decays into a stable ν_L, then for M_νL<42.7 GeV, the mass of L^± is excluded for all values of M_L^± > M_νL. Finally, while the mass of the stable ν_L is excluded up to 42.7 GeV, the mass of the unstable L⁰ is excluded up to 45.7 GeV with the mixing parameters |U_ℓL⁰|² down to 10^-13 at this mass. For 25.0 GeV < M_L⁰ < 42.7 GeV, all values of |U_ℓL⁰|² are excluded. All limits are given at 95% CL.

Original language	English (US)
Pages (from-to)	511-522
Number of pages	12
Journal	Physics Letters B
Volume	236
Issue number	4
DOIs	https://doi.org/10.1016/0370-2693(90)90392-J
State	Published - Mar 1 1990

All Science Journal Classification (ASJC) codes

Nuclear and High Energy Physics

Access to Document

10.1016/0370-2693(90)90392-J

Cite this

Decamp, D., Deschizeaux, B., Lees, J. P., Minard, M. N., Crespo, J. M., Delfino, M., Fernandez, E., Martinez, M., Miquel, R., Mir, L. M., Orteu, S., Pacheco, A., Perlas, J. A., Tubau, E., Catanesi, M. G., De Palma, M., Farilla, A., Iaselli, G., Maggi, G., ... Zobernig, G. (1990). A search for new quarks and leptons from Z⁰ decay at LEP. Physics Letters B, 236(4), 511-522. https://doi.org/10.1016/0370-2693(90)90392-J

@article{85cc79489a284af3a66ffab337dbd477,

title = "A search for new quarks and leptons from Z0 decay at LEP",

abstract = "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<42.7 GeV, the mass of L± is excluded for all values of ML± > 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.",

author = "D. Decamp and B. Deschizeaux and Lees, {J. P.} and Minard, {M. N.} and Crespo, {J. M.} and M. Delfino and E. Fernandez and M. Martinez and R. Miquel and Mir, {Ll M.} and S. Orteu and A. Pacheco and Perlas, {J. A.} and E. Tubau and Catanesi, {M. G.} and {De Palma}, M. and A. Farilla and G. Iaselli and G. Maggi and S. Natali and S. Nuzzo and A. Ranieri and G. Raso and F. Romano and F. Ruggieri and G. Selvaggi and L. Silvestris and P. Tempesta and G. Zito and H. Hu and D. Huang and J. Lin and T. Ruan and T. Wang and W. Wu and Y. Xie and D. Xu and R. Xu and J. Zhang and W. Zhao and H. Albrecht and Atwood, {W. B.} and F. Bird and E. Blucher and Burnett, {T. H.} and T. Charity and H. Drevermann and Ll Garrido and C. Grab and R. Hagelberg and S. Haywood and B. Jost and M. Kasemann and G. Kellner and J. Knobloch and A. Lacourt and I. Lehraus and T. Lohse and D. L{\"u}ke and A. Marchioro and P. Mato and J. May and A. Minten and A. Miotto and P. Palazzi and M. Pepe-Altarelli and F. Ranjard and A. Roth and J. Rothberg and H. Rotscheidt and {Von R{\"u}den}, W. and {St. Denis}, R. and D. Schlatter and M. Takashima and M. Talby and H. Taureg and W. Tejessy and H. Wachsmuth and S. Wheeler and W. Wiedenmann and W. Witzeling and J. Wotschack and Z. Ajaltouni and M. Bardadin-Otwinowska and A. Falvard and P. Gay and P. Henrard and J. Jousset and B. Michel and Montret, {J. C.} and D. Pallin and P. Perret and J. Proriol and F. Prulhi{\`e}re and Hansen, {J. D.} and Hansen, {J. R.} and Hansen, {P. H.} and R. M{\o}llerud and G. Petersen and E. Simopoulou and A. Vayaki and J. Badier and A. Blondel and G. Bonneaud and J. Bourotte and F. Braems and Brient, {J. C.} and Ciocci, {M. A.} and G. Fouque and R. Guirlet and A. Roug{\'e} and M. Rumpf and R. Tanaka and H. Videau and I. Videau and Candlin, {D. J.} and A. Conti and G. Parrini and M. Corden and C. Georgiopoulos and Goldman, {J. H.} and M. Ikeda and J. Lannutti and D. Levinthal and M. Mermikides and L. Sawyer and G. Stimpfl and A. Antonelli and R. Baldini and G. Bencivenni and G. Bologna and F. Bossi and P. Campana and G. Capon and V. Chiarella and {De Ninno}, G. and B. D'Ettorre-Piazzoli and G. Felici and P. Laurelli and G. Mannocchi and F. Murtas and Murtas, {G. P.} and G. Nicoletti and P. Picchi and P. Zografou and B. Altoon and O. Boyle and Halley, {A. W.} and {Ten Have}, I. and Hearns, {J. L.} and Hughes, {I. S.} and Lynch, {J. G.} and Morton, {W. T.} and C. Raine and Scarr, {J. M.} and K. Smith and Thompson, {A. S.} and B. Brandl and O. Braun and R. Geiges and C. Geweniger and P. Hanke and V. Hepp and Kluge, {E. E.} and Y. Maumary and M. Panter and A. Putzer and B. Rensch and A. Stahl and K. Tittel and M. Wunsch and Belk, {A. T.} and R. Beuselinck and Binnie, {D. M.} and W. Cameron and M. Cattaneo and Dornan, {P. J.} and S. Dugeay and Forty, {R. W.} and Greene, {A. M.} and Hassard, {J. F.} and Patton, {S. J.} and Sedgbeer, {J. K.} and G. Taylor and Tomalin, {I. R.} and Wright, {A. G.} and P. Girtler and D. Kuhn and G. Rudolph and Bowdery, {C. K.} and Brodbeck, {T. J.} and Finch, {A. J.} and F. Foster and G. Hughes and Keemer, {N. R.} and M. Nuttall and Rowlingson, {B. S.} and T. Sloan and Snow, {S. W.} and T. Barczewski and Bauerdick, {L. A.T.} and K. Kleinknecht and B. Renk and S. Roehn and Sander, {H. G.} and M. Schmelling and F. Steeg and Albanese, {J. P.} and Aubert, {J. J.} and C. Benchouk and A. Bonissent and D. Courvoisier and F. Etienne and E. Matsinos and S. Papalexiou and P. Payre and B. Pietrzyk and Z. Qian and W. Blum and P. Cattaneo and G. Cowan and B. Dehning and H. Dietl and M. Fernandez-Bosman and D. Hauff and A. Jahn and E. Lange and G. L{\"u}tjens and G. Lutz and W. M{\"a}nner and Moser, {H. G.} and Y. Pan and R. Richter and Schwarz, {A. S.} and R. Settles and U. Stiegler and U. Stierlin and J. Thomas and G. Waltermann and V. Bertin and {De Bouard}, G. and J. Boucrot and O. Callot and X. Chen and A. Cordier and M. Davier and G. Ganis and Grivaz, {J. F.} and Ph Heusse and P. Janot and V. Journ{\'e} and Kim, {D. W.} and J. Lefran{\c c}ois and Lutz, {A. M.} and Veillet, {J. J.} and F. Zomer and Amendolia, {S. R.} and G. Bagliesi and G. Batignani and L. Bosisio and U. Bottigli and C. Bradaschia and I. Ferrante and F. Fidecaro and L. Fo{\`a} and E. Focardi and F. Forti and A. Giassi and Giorgi, {M. A.} and F. Ligabue and A. Lusiani and Mannelli, {E. B.} and Marrocchesi, {P. S.} and A. Messineo and F. Palla and G. Sanguinetti and S. Scapellato and J. Steinberger and R. Tenchini and G. Tonelli and G. Triggiani and Carter, {J. M.} and Green, {M. G.} and March, {P. V.} and T. Medcalf and Saich, {M. R.} and Strong, {J. A.} and Thomas, {R. M.} and T. Wildish and Botterill, {D. R.} and Clifft, {R. W.} and Edgecock, {T. R.} and M. Edwards and Fisher, {S. M.} and J. Harvey and Jones, {T. J.} and Norton, {P. R.} and Salmon, {D. P.} and Thompson, {J. C.} and E. Aubourg and B. Bloch-Devaux and P. Colas and C. Klopfenstein and E. Lan{\c c}on and E. Locci and S. Loucatos and L. Mirabito and E. Monnier and P. Perez and F. Perrier and J. Rander and Renardy, {J. F.} and A. Roussarie and Schuller, {J. P.} and Ashman, {J. G.} and Booth, {C. N.} and F. Combley and M. Dinsdale and J. Martin and D. Parker and Thompson, {L. F.} and S. Brandt and H. Burkhardt and C. Grupen and H. Meinhard and E. Neugebauer and U. Sch{\"a}fer and H. Seywerd and B. Gobbo and F. Liello and E. Milotti and F. Ragusa and L. Rolandi and L. Bellantoni and Boudreau, {J. F.} and D. Cinabro and Conway, {J. S.} and Cowen, {D. F.} and Z. Feng and Harton, {J. L.} and J. Hilgart and Jared, {R. C.} and Johnson, {R. P.} and Leclaire, {B. W.} and Pan, {Y. B.} and T. Parker and Pater, {J. R.} and Y. Saadi and V. Sharma and Wear, {J. A.} and Weber, {F. V.} and {Sau Lan Wu}, {Lan Wu} and Xue, {S. T.} and G. Zobernig",

note = "Funding Information: The recent operation of the Large Electron-Positron Collider, LEP, at CERN, provides an excellent opportunity to carry out searches for new particles. Using data recorded during the first period of LEP operation from September 19 to November 7, 1989, we have performed searches for a top quark (t), a fourth-generation charge -\] bottom type quark (b'), a sequential heavy charged lepton (L + ), an unstable neutral heavy lepton (L °) and a stable neutral i Present address: CERN, CH-1211 Geneva 23, Switzerland. 2 Supported by CAICYT, Spain. 3 Supported by the National Science Foundation of China. 4 Permanent address: DESY, D-2000 Hamburg 52, FRG. 5 On leave of absence from SLAC, Stanford, CA 94309, USA. 6 On leave of absence from University of Washington, Seattle, WA 98195, USA. 7 Supported by the Danish Natural Science Research Council. 8 Supported by the UK Science and Engineering Research Council. 9 Supported by SLOAN fellowship, contract BR 2703. io Supported by the US Department of Energy, contract DE-FG05-87ER40319. 11 Supported by the NSF, contract PHY-8451274. 12 Supported by the US Department of Energy, contract DE-FCOS-85ER250000. 3 Also at Istituto di Fisica Generale, Universith di Torino, Turin, Italy. 14 Also at Istituto di Cosmo-Geofisica del CNR, Turin, Italy. 15 Supported by the Bundesministerium fiir Forschung und Technologie, FRG. 16 Supported by Fonds zur Frrderung der wissenshaftlichen Forschung, Austria. 17 Supported by the lnstitut de Recherche Fondamentale du CEA. t8 Present address: INFN, Sezione di Milano, 1-20133 Milan, Italy. 19 Permanent address: LBL, Berkeley, CA 94720, USA. zo Supported by the US Department of Energy, contract DE-AC02-76ER00881.",

year = "1990",

month = mar,

day = "1",

doi = "10.1016/0370-2693(90)90392-J",

language = "English (US)",

volume = "236",

pages = "511--522",

journal = "Physics Letters B",

issn = "0370-2693",

publisher = "Elsevier B.V.",

number = "4",

}

Decamp, D, Deschizeaux, B, Lees, JP, Minard, MN, Crespo, JM, Delfino, M, Fernandez, E, Martinez, M, Miquel, R, Mir, LM, Orteu, S, Pacheco, A, Perlas, JA, Tubau, E, Catanesi, MG, De Palma, 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, Atwood, WB, Bird, F, Blucher, E, Burnett, TH, Charity, T, Drevermann, H, Garrido, L, Grab, C, Hagelberg, R, Haywood, S, Jost, B, Kasemann, M, Kellner, G, Knobloch, J, Lacourt, A, Lehraus, I, Lohse, T, Lüke, D, Marchioro, A, Mato, P, May, J, Minten, A, Miotto, A, Palazzi, P, Pepe-Altarelli, M, Ranjard, F, Roth, A, Rothberg, J, Rotscheidt, H, Von Rüden, W, St. Denis, R, Schlatter, D, Takashima, M, Talby, M, Taureg, H, Tejessy, W, Wachsmuth, H, Wheeler, S, Wiedenmann, W, Witzeling, W, Wotschack, J, Ajaltouni, Z, Bardadin-Otwinowska, M, Falvard, A, Gay, P, Henrard, P, Jousset, J, Michel, B, Montret, JC, Pallin, D, Perret, P, Proriol, J, Prulhière, F, Hansen, JD, Hansen, JR, Hansen, PH, Møllerud, R, Petersen, G, Simopoulou, E, Vayaki, A, Badier, J, Blondel, A, Bonneaud, G, Bourotte, J, Braems, F, Brient, JC, Ciocci, MA, Fouque, G, Guirlet, R, Rougé, A, Rumpf, M, Tanaka, R, Videau, H, Videau, I, Candlin, DJ, Conti, A, Parrini, G, Corden, M, Georgiopoulos, C, Goldman, JH, Ikeda, M, Lannutti, J, Levinthal, D, Mermikides, M, Sawyer, L, Stimpfl, G, Antonelli, A, Baldini, R, Bencivenni, G, Bologna, G, Bossi, F, Campana, P, Capon, G, Chiarella, V, De Ninno, G, D'Ettorre-Piazzoli, B, Felici, G, Laurelli, P, Mannocchi, G, Murtas, F, Murtas, GP, Nicoletti, G, Picchi, P, Zografou, P, Altoon, B, Boyle, O, Halley, AW, Ten Have, I, Hearns, JL, Hughes, IS, Lynch, JG, Morton, WT, Raine, C, Scarr, JM, Smith, K, Thompson, AS, Brandl, B, Braun, O, Geiges, R, Geweniger, C, Hanke, P, Hepp, V, Kluge, EE, Maumary, Y, Panter, M, Putzer, A, Rensch, B, Stahl, A, Tittel, K, Wunsch, M, Belk, AT, Beuselinck, R, Binnie, DM, Cameron, W, Cattaneo, M, Dornan, PJ, Dugeay, S, Forty, RW, Greene, AM, Hassard, JF, Patton, SJ, Sedgbeer, JK, Taylor, G, Tomalin, IR, Wright, AG, Girtler, P, Kuhn, D, Rudolph, G, Bowdery, CK, Brodbeck, TJ, Finch, AJ, Foster, F, Hughes, G, Keemer, NR, Nuttall, M, Rowlingson, BS, Sloan, T, Snow, SW, Barczewski, T, Bauerdick, LAT, Kleinknecht, K, Renk, B, Roehn, S, Sander, HG, Schmelling, M, Steeg, F, Albanese, JP, Aubert, JJ, Benchouk, C, Bonissent, A, Courvoisier, D, Etienne, F, Matsinos, E, Papalexiou, S, Payre, P, Pietrzyk, B, Qian, Z, Blum, W, Cattaneo, P, Cowan, G, Dehning, B, Dietl, H, Fernandez-Bosman, M, Hauff, D, Jahn, A, Lange, E, Lütjens, G, Lutz, G, Männer, W, Moser, HG, Pan, Y, Richter, R, Schwarz, AS, Settles, R, Stiegler, U, Stierlin, U, Thomas, J, Waltermann, G, Bertin, V, De Bouard, G, Boucrot, J, Callot, O, Chen, X, Cordier, A, Davier, M, Ganis, G, Grivaz, JF, Heusse, P, Janot, P, Journé, V, Kim, DW, Lefrançois, J, Lutz, AM, Veillet, JJ, Zomer, F, Amendolia, SR, Bagliesi, G, Batignani, G, Bosisio, L, Bottigli, U, Bradaschia, C, Ferrante, I, Fidecaro, F, Foà, L, Focardi, E, Forti, F, Giassi, A, Giorgi, MA, Ligabue, F, Lusiani, A, Mannelli, EB, Marrocchesi, PS, Messineo, A, Palla, F, Sanguinetti, G, Scapellato, S, Steinberger, J, Tenchini, R, Tonelli, G, Triggiani, G, Carter, JM, Green, MG, March, PV, Medcalf, T, Saich, MR, Strong, JA, Thomas, RM, Wildish, T, Botterill, DR, Clifft, RW, Edgecock, TR, Edwards, M, Fisher, SM, Harvey, J, Jones, TJ, Norton, PR, Salmon, DP, Thompson, JC, Aubourg, E, Bloch-Devaux, B, Colas, P, Klopfenstein, C, Lançon, E, Locci, E, Loucatos, S, Mirabito, L, Monnier, E, Perez, P, Perrier, F, Rander, J, Renardy, JF, Roussarie, A, Schuller, JP, Ashman, JG, Booth, CN, Combley, F, Dinsdale, M, Martin, J, Parker, D, Thompson, LF, Brandt, S, Burkhardt, H, Grupen, C, Meinhard, H, Neugebauer, E, Schäfer, U, Seywerd, H, Gobbo, B, Liello, F, Milotti, E, Ragusa, F, Rolandi, L, Bellantoni, L, Boudreau, JF, Cinabro, D, Conway, JS, Cowen, DF, Feng, Z, Harton, JL, Hilgart, J, Jared, RC, Johnson, RP, Leclaire, BW, Pan, YB, Parker, T, Pater, JR, Saadi, Y, Sharma, V, Wear, JA, Weber, FV, Sau Lan Wu, LW, Xue, ST & Zobernig, G 1990, 'A search for new quarks and leptons from Z⁰ decay at LEP', Physics Letters B, vol. 236, no. 4, pp. 511-522. https://doi.org/10.1016/0370-2693(90)90392-J

TY - JOUR

T1 - A search for new quarks and leptons from Z0 decay at LEP

AU - Decamp, D.

AU - Deschizeaux, B.

AU - Lees, J. P.

AU - Minard, M. N.

AU - Crespo, J. M.

AU - Delfino, M.

AU - Fernandez, E.

AU - Martinez, M.

AU - Miquel, R.

AU - Mir, Ll M.

AU - Orteu, S.

AU - Pacheco, A.

AU - Perlas, J. A.

AU - Tubau, E.

AU - Catanesi, M. G.

AU - De Palma, M.

AU - Farilla, A.

AU - Iaselli, G.

AU - Maggi, G.

AU - Natali, S.

AU - Nuzzo, S.

AU - Ranieri, A.

AU - Raso, G.

AU - Romano, F.

AU - Ruggieri, F.

AU - Selvaggi, G.

AU - Silvestris, L.

AU - Tempesta, P.

AU - Zito, G.

AU - Hu, H.

AU - Huang, D.

AU - Lin, J.

AU - Ruan, T.

AU - Wang, T.

AU - Wu, W.

AU - Xie, Y.

AU - Xu, D.

AU - Xu, R.

AU - Zhang, J.

AU - Zhao, W.

AU - Albrecht, H.

AU - Atwood, W. B.

AU - Bird, F.

AU - Blucher, E.

AU - Burnett, T. H.

AU - Charity, T.

AU - Drevermann, H.

AU - Garrido, Ll

AU - Grab, C.

AU - Hagelberg, R.

AU - Haywood, S.

AU - Jost, B.

AU - Kasemann, M.

AU - Kellner, G.

AU - Knobloch, J.

AU - Lacourt, A.

AU - Lehraus, I.

AU - Lohse, T.

AU - Lüke, D.

AU - Marchioro, A.

AU - Mato, P.

AU - May, J.

AU - Minten, A.

AU - Miotto, A.

AU - Palazzi, P.

AU - Pepe-Altarelli, M.

AU - Ranjard, F.

AU - Roth, A.

AU - Rothberg, J.

AU - Rotscheidt, H.

AU - Von Rüden, W.

AU - St. Denis, R.

AU - Schlatter, D.

AU - Takashima, M.

AU - Talby, M.

AU - Taureg, H.

AU - Tejessy, W.

AU - Wachsmuth, H.

AU - Wheeler, S.

AU - Wiedenmann, W.

AU - Witzeling, W.

AU - Wotschack, J.

AU - Ajaltouni, Z.

AU - Bardadin-Otwinowska, M.

AU - Falvard, A.

AU - Gay, P.

AU - Henrard, P.

AU - Jousset, J.

AU - Michel, B.

AU - Montret, J. C.

AU - Pallin, D.

AU - Perret, P.

AU - Proriol, J.

AU - Prulhière, F.

AU - Hansen, J. D.

AU - Hansen, J. R.

AU - Hansen, P. H.

AU - Møllerud, R.

AU - Petersen, G.

AU - Simopoulou, E.

AU - Vayaki, A.

AU - Badier, J.

AU - Blondel, A.

AU - Bonneaud, G.

AU - Bourotte, J.

AU - Braems, F.

AU - Brient, J. C.

AU - Ciocci, M. A.

AU - Fouque, G.

AU - Guirlet, R.

AU - Rougé, A.

AU - Rumpf, M.

AU - Tanaka, R.

AU - Videau, H.

AU - Videau, I.

AU - Candlin, D. J.

AU - Conti, A.

AU - Parrini, G.

AU - Corden, M.

AU - Georgiopoulos, C.

AU - Goldman, J. H.

AU - Ikeda, M.

AU - Lannutti, J.

AU - Levinthal, D.

AU - Mermikides, M.

AU - Sawyer, L.

AU - Stimpfl, G.

AU - Antonelli, A.

AU - Baldini, R.

AU - Bencivenni, G.

AU - Bologna, G.

AU - Bossi, F.

AU - Campana, P.

AU - Capon, G.

AU - Chiarella, V.

AU - De Ninno, G.

AU - D'Ettorre-Piazzoli, B.

AU - Felici, G.

AU - Laurelli, P.

AU - Mannocchi, G.

AU - Murtas, F.

AU - Murtas, G. P.

AU - Nicoletti, G.

AU - Picchi, P.

AU - Zografou, P.

AU - Altoon, B.

AU - Boyle, O.

AU - Halley, A. W.

AU - Ten Have, I.

AU - Hearns, J. L.

AU - Hughes, I. S.

AU - Lynch, J. G.

AU - Morton, W. T.

AU - Raine, C.

AU - Scarr, J. M.

AU - Smith, K.

AU - Thompson, A. S.

AU - Brandl, B.

AU - Braun, O.

AU - Geiges, R.

AU - Geweniger, C.

AU - Hanke, P.

AU - Hepp, V.

AU - Kluge, E. E.

AU - Maumary, Y.

AU - Panter, M.

AU - Putzer, A.

AU - Rensch, B.

AU - Stahl, A.

AU - Tittel, K.

AU - Wunsch, M.

AU - Belk, A. T.

AU - Beuselinck, R.

AU - Binnie, D. M.

AU - Cameron, W.

AU - Cattaneo, M.

AU - Dornan, P. J.

AU - Dugeay, S.

AU - Forty, R. W.

AU - Greene, A. M.

AU - Hassard, J. F.

AU - Patton, S. J.

AU - Sedgbeer, J. K.

AU - Taylor, G.

AU - Tomalin, I. R.

AU - Wright, A. G.

AU - Girtler, P.

AU - Kuhn, D.

AU - Rudolph, G.

AU - Bowdery, C. K.

AU - Brodbeck, T. J.

AU - Finch, A. J.

AU - Foster, F.

AU - Hughes, G.

AU - Keemer, N. R.

AU - Nuttall, M.

AU - Rowlingson, B. S.

AU - Sloan, T.

AU - Snow, S. W.

AU - Barczewski, T.

AU - Bauerdick, L. A.T.

AU - Kleinknecht, K.

AU - Renk, B.

AU - Roehn, S.

AU - Sander, H. G.

AU - Schmelling, M.

AU - Steeg, F.

AU - Albanese, J. P.

AU - Aubert, J. J.

AU - Benchouk, C.

AU - Bonissent, A.

AU - Courvoisier, D.

AU - Etienne, F.

AU - Matsinos, E.

AU - Papalexiou, S.

AU - Payre, P.

AU - Pietrzyk, B.

AU - Qian, Z.

AU - Blum, W.

AU - Cattaneo, P.

AU - Cowan, G.

AU - Dehning, B.

AU - Dietl, H.

AU - Fernandez-Bosman, M.

AU - Hauff, D.

AU - Jahn, A.

AU - Lange, E.

AU - Lütjens, G.

AU - Lutz, G.

AU - Männer, W.

AU - Moser, H. G.

AU - Pan, Y.

AU - Richter, R.

AU - Schwarz, A. S.

AU - Settles, R.

AU - Stiegler, U.

AU - Stierlin, U.

AU - Thomas, J.

AU - Waltermann, G.

AU - Bertin, V.

AU - De Bouard, G.

AU - Boucrot, J.

AU - Callot, O.

AU - Chen, X.

AU - Cordier, A.

AU - Davier, M.

AU - Ganis, G.

AU - Grivaz, J. F.

AU - Heusse, Ph

AU - Janot, P.

AU - Journé, V.

AU - Kim, D. W.

AU - Lefrançois, J.

AU - Lutz, A. M.

AU - Veillet, J. J.

AU - Zomer, F.

AU - Amendolia, S. R.

AU - Bagliesi, G.

AU - Batignani, G.

AU - Bosisio, L.

AU - Bottigli, U.

AU - Bradaschia, C.

AU - Ferrante, I.

AU - Fidecaro, F.

AU - Foà, L.

AU - Focardi, E.

AU - Forti, F.

AU - Giassi, A.

AU - Giorgi, M. A.

AU - Ligabue, F.

AU - Lusiani, A.

AU - Mannelli, E. B.

AU - Marrocchesi, P. S.

AU - Messineo, A.

AU - Palla, F.

AU - Sanguinetti, G.

AU - Scapellato, S.

AU - Steinberger, J.

AU - Tenchini, R.

AU - Tonelli, G.

AU - Triggiani, G.

AU - Carter, J. M.

AU - Green, M. G.

AU - March, P. V.

AU - Medcalf, T.

AU - Saich, M. R.

AU - Strong, J. A.

AU - Thomas, R. M.

AU - Wildish, T.

AU - Botterill, D. R.

AU - Clifft, R. W.

AU - Edgecock, T. R.

AU - Edwards, M.

AU - Fisher, S. M.

AU - Harvey, J.

AU - Jones, T. J.

AU - Norton, P. R.

AU - Salmon, D. P.

AU - Thompson, J. C.

AU - Aubourg, E.

AU - Bloch-Devaux, B.

AU - Colas, P.

AU - Klopfenstein, C.

AU - Lançon, E.

AU - Locci, E.

AU - Loucatos, S.

AU - Mirabito, L.

AU - Monnier, E.

AU - Perez, P.

AU - Perrier, F.

AU - Rander, J.

AU - Renardy, J. F.

AU - Roussarie, A.

AU - Schuller, J. P.

AU - Ashman, J. G.

AU - Booth, C. N.

AU - Combley, F.

AU - Dinsdale, M.

AU - Martin, J.

AU - Parker, D.

AU - Thompson, L. F.

AU - Brandt, S.

AU - Burkhardt, H.

AU - Grupen, C.

AU - Meinhard, H.

AU - Neugebauer, E.

AU - Schäfer, U.

AU - Seywerd, H.

AU - Gobbo, B.

AU - Liello, F.

AU - Milotti, E.

AU - Ragusa, F.

AU - Rolandi, L.

AU - Bellantoni, L.

AU - Boudreau, J. F.

AU - Cinabro, D.

AU - Conway, J. S.

AU - Cowen, D. F.

AU - Feng, Z.

AU - Harton, J. L.

AU - Hilgart, J.

AU - Jared, R. C.

AU - Johnson, R. P.

AU - Leclaire, B. W.

AU - Pan, Y. B.

AU - Parker, T.

AU - Pater, J. R.

AU - Saadi, Y.

AU - Sharma, V.

AU - Wear, J. A.

AU - Weber, F. V.

AU - Sau Lan Wu, Lan Wu

AU - Xue, S. T.

AU - Zobernig, G.

N1 - Funding Information: The recent operation of the Large Electron-Positron Collider, LEP, at CERN, provides an excellent opportunity to carry out searches for new particles. Using data recorded during the first period of LEP operation from September 19 to November 7, 1989, we have performed searches for a top quark (t), a fourth-generation charge -\] bottom type quark (b'), a sequential heavy charged lepton (L + ), an unstable neutral heavy lepton (L °) and a stable neutral i Present address: CERN, CH-1211 Geneva 23, Switzerland. 2 Supported by CAICYT, Spain. 3 Supported by the National Science Foundation of China. 4 Permanent address: DESY, D-2000 Hamburg 52, FRG. 5 On leave of absence from SLAC, Stanford, CA 94309, USA. 6 On leave of absence from University of Washington, Seattle, WA 98195, USA. 7 Supported by the Danish Natural Science Research Council. 8 Supported by the UK Science and Engineering Research Council. 9 Supported by SLOAN fellowship, contract BR 2703. io Supported by the US Department of Energy, contract DE-FG05-87ER40319. 11 Supported by the NSF, contract PHY-8451274. 12 Supported by the US Department of Energy, contract DE-FCOS-85ER250000. 3 Also at Istituto di Fisica Generale, Universith di Torino, Turin, Italy. 14 Also at Istituto di Cosmo-Geofisica del CNR, Turin, Italy. 15 Supported by the Bundesministerium fiir Forschung und Technologie, FRG. 16 Supported by Fonds zur Frrderung der wissenshaftlichen Forschung, Austria. 17 Supported by the lnstitut de Recherche Fondamentale du CEA. t8 Present address: INFN, Sezione di Milano, 1-20133 Milan, Italy. 19 Permanent address: LBL, Berkeley, CA 94720, USA. zo Supported by the US Department of Energy, contract DE-AC02-76ER00881.

PY - 1990/3/1

Y1 - 1990/3/1

N2 - 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<42.7 GeV, the mass of L± is excluded for all values of ML± > 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.

AB - 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<42.7 GeV, the mass of L± is excluded for all values of ML± > 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.

UR - http://www.scopus.com/inward/record.url?scp=0005681701&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0005681701&partnerID=8YFLogxK

U2 - 10.1016/0370-2693(90)90392-J

DO - 10.1016/0370-2693(90)90392-J

M3 - Article

AN - SCOPUS:0005681701

SN - 0370-2693

VL - 236

SP - 511

EP - 522

JO - Physics Letters B

JF - Physics Letters B

IS - 4

ER -

A search for new quarks and leptons from Z⁰ decay at LEP

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