Scalar quark searches in e+e- collisions at √s = 181 - 184 GeV

R. Barate, D. Buskulic, D. Decamp, P. Ghez, C. Goy, S. Jezequel, J. P. Lees, A. Lucotte, F. Martin, E. Merle, M. N. Minard, J. Y. Nief, B. Pietrzyk, R. Alemany, G. Boix, M. P. Casado, M. Chmeissani, J. M. Crespo, M. Delfino, E. FernandezM. Fernandez-Bosman, L. Garrido, E. Graugès, A. Juste, M. Martinez, G. Merino, R. Miquel, L. M. Mir, P. Morawitz, I. C. Park, A. Pascual, I. Riu, F. Sanchez, A. Colaleo, D. Creanza, M. de Palma, G. Gelao, G. Iaselli, G. Maggi, M. Maggi, 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, U. Becker, P. Bright-Thomas, D. Casper, M. Cattaneo, V. Ciulli, G. Dissertori, H. Drevermann, R. W. Forty, M. Frank, F. Gianotti, R. Hagelberg, J. B. Hansen, J. Harvey, P. Janot, B. Jost, I. Lehraus, P. Maley, P. Mato, A. Minten, L. Moneta, N. Qi, A. Pacheco, F. Ranjard, L. Rolandi, D. Rousseau, D. Schlatter, M. Schmitt, O. Schneider, W. Tejessy, F. Teubert, I. R. Tomalin, M. Vreeswijk, H. Wachsmuth, Z. Ajaltouni, F. Badaud, G. Chazelle, O. Deschamps, A. Falvard, C. Ferdi, P. Gay

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Abstract

Searches for scalar top, scalar bottom and degenerate scalar quarks have been performed with data collected with the ALEPH detector at LEP. The data sample consists of 57 pb-1 taken at √s = 181-184 GeV. No evidence for scalar top, scalar bottom or degenerate scalar quarks was found in the channels t̃ → cx, t̃ → bℓṽ, b̃ → bx, and q̃ → qx. From the channel t̃ → cx a limit of 74 GeV/c2 has been set on the scalar top quark mass, independent of the mixing angle. This limit assumes a mass difference between the t̃ and the x in the range 10-40 GeV/c2. From the channel t̃ → bℓṽ the mixing-angle-independent scalar top limit is 82 GeV/c2, assuming mt̃ - mṽ > 10 GeV/c2. From the channel b̃ → bx, a limit of 79 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 for mb̃-mx > 10 GeV/c2. From the channel q̃ → qx a limit of 87 GeV/c2 has been set on the mass of supersymmetric partners of light quarks assuming five degenerate flavours and the production of both "left-handed" and "right-handed" squarks. This limit is valid for mq̃-mx > 5 GeV/c2. © 1998 Published by Elsevier Science B.V. All rights reserved.
Original languageEnglish
Pages (from-to)189-199
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume434
DOIs
Publication statusPublished - 20 Aug 1998

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