Searches for scalar top and scalar bottom quarks at LEP2

R. Barate*, D. Buskulic, D. Decamp, P. Ghez, C. Goy, J. P. Lees, A. Lucotte, M. N. Minard, J. Y. Nief, B. Pietrzyk, M. P. Casado, M. Chmeissani, P. Comas, J. M. Crespo, M. Delfino, E. Fernandez, M. Fernandez-Bosman, LI Garrido, A. Juste, M. MartinezG. Merino, R. Miquel, L. M. Mir, C. Padilla, I. C. Park, A. Pascual, J. A. Perlas, I. Riu, F. Sanchez, F. Teubert, A. Colaleo, D. Creanza, M. de Palma, G. Gelao, G. Iaselli, G. Maggi, M. Maggi, N. Marinelli, S. Nuzzo, A. Ranieri, G. Raso, F. Ruggieri, G. Selvaggi, L. Silvestris, P. Tempesta, A. Tricomi, G. Zito, X. Huang, J. Lin, Q. Ouyang, T. Wang, Y. Xie, R. Xu, S. Xue, J. Zhang, L. Zhang, W. Zhao, D. Abbaneo, R. Alemany, A. O. Bazarko, U. Becker, P. Bright-Thomas, M. Cattaneo, F. Cerutti, G. Dissertori, H. Drevermann, R. W. Forty, M. Frank, R. Hagelberg, J. B. Hansen, J. Harvey, P. Janot, B. Jost, E. Kneringer, J. Knobloch, I. Lehraus, P. Mato, A. Minten, L. Moneta, A. Pacheco, J. F. Pusztaszeri, F. Ranjard, G. Rizzo, L. Rolandi, D. Rousseau, D. Schlatter, M. Schmitt, O. Schneider, W. Tejessy, I. R. Tomalin, H. Wachsmuth, A. Wagner, Z. Ajaltouni, A. Barrès, C. Boyer, A. Falvard, C. Ferdi, P. Gay, C. Guicheney, P. Henrard, J. Jousset, B. Michel, S. Monteil, J. C. Montret, D. Pallin, P. Perret, F. Podlyski, J. Proriol, P. Rosnet, J. M. Rossignol, T. Fearnley, J. D. Hansen, J. R. Hansen, P. H. Hansen, B. S. Nilsson, B. Rensch, A. Wäänänen, G. Daskalakis, A. Kyriakis, C. Markou, E. Simopoulou, A. Vayaki, A. Blondel, J. C. Brient, F. Machefert, A. Rougé, M. Rumpf, A. Valassi, H. Videau, E. Focardi, G. Parrini, K. Zachariadou, R. Cavanaugh, M. Corden, C. Georgiopoulos, T. Huehn, D. E. Jaffe, A. Antonelli, G. Bencivenni, G. Bologna, F. Bossi, P. Campana, G. Capon, D. Casper, V. Chiarella, G. Felici, P. Laurelli, G. Mannocchi, F. Murtas, G. P. Murtas, L. Passalacqua, M. Pepe-Altarelli, L. Curtis, SJ Dorris, A. W. Halley, I. G. Knowles, J. G. Lynch, V. O'Shea, C. Raine, J. M. Scarr, K. Smith, P. Teixeira-Dias, A. S. Thompson, E. Thomson, F. Thomson, R. M. Turnbull, O. Buchmüller, S. Dhamotharan, C. Geweniger, G. Graefe, P. Hanke, G. Hansper, V. Hepp, E. E. Kluge, A. Putzer, J. Sommer, K. Tittel, S. Werner, M. Wunsch, R. Beuselinck, D. M. Binnie, W. Cameron, P. J. Dornan, M. Girone, S. Goodsir, E. B. Martin, P. Morawitz, A. Moutoussi, J. Nash, J. K. Sedgbeer, P. Spagnolo, A. M. Stacey, M. D. Williams, V. M. Ghete, P. Girtler, D. Kuhn, G. Rudolph, A. P. Betteridge, C. K. Bowdery, P. Colrain, G. Crawford, A. J. Finch, F. Foster, G. Hughes, R. W L Jones, T. Sloan, E. P. Whelan, M. I. Williams, C. Hoffmann, K. Jakobs, K. Kleinknecht, G. Quast, B. Renk, E. Rohne, H. G. Sander, P. van Gemmeren, C. Zeitnitz, J. J. Aubert, C. Benchouk, A. Bonissent, G. Bujosa, J. Carr, P. Coyle, C. Diaconu, A. Ealet, D. Fouchez, N. Konstantinidis, O. Leroy, F. Motsch, P. Payre, M. Talby, A. Sadouki, M. Thulasidas, A. Tilquin, K. Trabelsi, M. Aleppo, M. Antonelli, F. Ragusa, R. Berlich, W. Blum, V. Büscher, H. Dietl, G. Ganis, C. Gotzhein, H. Kroha, G. Lütjens, G. Lutz, W. Manner, H. G. Moser, R. Richter, A. Rosado-Schlosser, S. Schael, R. Settles, H. Seywerd, R. S. Denis, H. Stenzel, W. Wiedenmann, G. Wolf, J. Boucrot, O. Callot, S. Chen, A. Cordier, M. Davier, L. Duflot, J. F. Grivaz, P. Heusse, A. Höcker, A. Jacholkowska, M. Jacquet, D. W. Kim, F. Le Diberder, J. Lefrançois, A. M. Lutz, I. Nikolic, M. H. Schune, L. Serin, S. Simion, E. Tournefier, J. J. Veillet, I. Videau, D. Zerwas, P. Azzurri, G. Bagliesi, S. Bettarini, C. Bozzi, G. Calderini, V. Ciulli, R. Dell'Orso, R. Fantechi, I. Ferrante, A. Giassi, A. Gregorio, F. Ligabue, A. Lusiani, P. S. Marrocchesi, A. Messineo, F. Palla, G. Sanguinetti, A. Sciabà, G. Sguazzoni, J. Steinberger, R. Tenchini, C. Vannini, A. Venturi, P. G. Verdini, G. A. Blair, L. M. Bryant, J. T. Chambers, Y. Gao, M. G. Green, T. Medcalf, P. Perrodo, J. A. Strong, J. H. von Wimmersperg-Toeller, D. R. Botterill, R. W. Clifft, T. R. Edgecock, S. Haywood, P. Maley, P. R. Norton, J. C. Thompson, A. E. Wright, B. Bloch-Devaux, P. Colas, B. Fabbro, W. Kozanecki, E. Lançon, M. C. Lemaire, E. Locci, P. Perez, J. Rander, J. F. Renardy, A. Rosowsky, A. Roussarie, J. P. Schuller, J. Schwindling, A. Trabelsi, B. Vallage, S. N. Black, J. H. Dann, H. Y. Kim, A. M. Litke, M. A. McNeil, G. Taylor, C. N. Booth, R. Boswell, C. A J Brew, S. Cartwright, F. Combley, M. S. Kelly, M. Lehto, W. M. Newton, J. Reeve, L. F. Thompson, K. Affholderbach, A. Böhrer, S. Brandt, G. Cowan, J. Foss, C. Grapen, G. Lutters, P. Saraiva, L. Smolik, F. Stephan, M. Apollonio, L. Bosisio, R. Delia Marina, G. Giannini, B. Gobbo, G. Musolino, J. Putz, J. Rothberg, S. Wasserbaech, R. W. Williams, S. R. Armstrong, E. Charles, P. Elmer, D. P S Ferguson, S. Gonzalez, T. C. Greening, OJ Hayes, H. Hu, S. Jin, P. A. McNamara, J. M. Nachtman, J. Nielsen, W. Orejudos, Y. B. Pan, Y. Saadi, I. J. Scott, J. Walsh, S. L. Wu, X. Wu, J. M. Yamartino, G. Zobernig

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

26 Scopus citations

Abstract

Searches for scalar top and bottom quarks have been performed with data collected by the ALEPH detector at LEP. The data sample consists of 21.7 pb-1 taken at √s = 161, 170, and 172 GeV and 5.7 pb-1 taken at √s = 130 and 136 GeV. No evidence for scalar top quarks or scalar bottom quarks was found in the channels t̃ → c χ, t̃ → bℓṽ, and b̃ → bχ. For the channel t̃ → c χ a limit of 67 GeV/c2 has been set on the scalar top quark mass, independent of the mixing angle between the supersymmetric partners of the left and right-handed states of the top quark. This limit assumes a mass difference between the t̃ and the χ of at least 10 GeV/c2. For the channel χ → bℓṽ the mixing-angle independent scalar top limit is 70 GeV/c2, assuming a mass difference between the t̄ and the ṽ of at least 10 GeV/c2. For the channel b̄ →bχ, a limit of 73 GeV/c2 has been set on the mass of the supersymmetric partner of the left-handed state of the bottom quark. This limit is valid if the mass difference between the b̃ and the χ is at least 10 GeV/c2.

Original languageEnglish (US)
Pages (from-to)431-446
Number of pages16
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume413
Issue number3-4
DOIs
StatePublished - Nov 13 1997

Funding

I8 Supported by Fonds zur FGrdmmg der wissenschaftlichenF orschung, Austria. I9 Supported by the Direction des Sciences de la Ma&e, C.E.A. ” Supported by the US Departmento f Energy, grant DE-FG03-92ER40689. 21 Supportedb y the US Departmento f Energy, grant DE-FG0295-ER40896. 6 Supported by the Commission of the European Communities, contract ERBCHBICT941234. 7 Also Istimto di Fisica Generale, Universit’ad i Torino, Torino, Italy. s Also Istituto di Cosmo-Geofisica de1C .N.R., Torino, Italy. 9 Also at CERN, 1211 Geneva 23,Switzerland. lo Permanenta ddress:Kangnung National University, Kangnung, Korea. ‘* Supported by the National Science Foundation of China. l3 Supported by the Danish Natural Science Research Council. I4 Supported by the US Departmento f Energy, contract DE-FG05-92ER40742. l5 Supportedb y the US Departmento f Energy, contract DE-FC05-85ER250000. r6 Supportedb y the UK Particle Physics and Astronomy Research Council. I7 Supported by the Bundesministeriumf lir Bildung, Wissenschaft, Forschung turd Technologie, Germany.

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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