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

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

Department of Physics

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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. © 1990.

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

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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., ... Simopoulou, E. (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{0b8b642a154f42bf955230a0ecb65fc5,

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. {\textcopyright} 1990.",

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",

year = "1990",

month = mar,

day = "1",

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

language = "English",

volume = "236",

pages = "511--522",

journal = "Physics Letters B",

issn = "0370-2693",

publisher = "Elsevier",

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 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.

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. © 1990.

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. © 1990.

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

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

M3 - Article

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