Search for stable hadronizing squarks and gluinos in e+e- collisions up to sqrt(s) = 209 GeV

Searches for stable, hadronizing scalar quarks and gluinos are performed using the data collected with the ALEPH detector at LEP. Gluon splitting into a gluino or a squark pair is searched for at centre-of-mass energies around the Z resonance, in the e+e- -> q qbar gluino gluino and q qbar squark...

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Veröffentlicht in:	The European physical journal. C, Particles and fields Particles and fields, 2003-05, Vol.31, p.327-342
Hauptverfasser:	Heister, A., Schael, S., Barate, R., Bruneliere, R., Bonis, I. De, Decamp, D., Goy, C., Jezequel, S., Lees, J P., Martin, F., Merle, E., Minard, M N., Pietrzyk, B., Trocme, B., Bravo, S., Casado, M P., Chmeissani, M., Crespo, J M., Fernandez, E., Fernandez-Bosman, M., Garrido, L., Martinez, M., Pacheco, A., Ruiz, H., Colaleo, A., Creanza, D., Filippis, N. De, Palma, M. De, Iaselli, G., Maggi, G., Maggi, M., Nuzzo, S., Ranieri, A., Raso, G., Ruggieri, F., Selvaggi, G., Silvestris, L., Tempesta, P., Tricomi, A., Zito, G., Huang, X., Lin, Jiali, Ouyang, Q., Wang, T., Xie, Y., Xu, R., Xue, S., Zhang, J., Zhang, L., Zhao, W., Abbaneo, D., Barklow, T., Buchmueller, O., Cattaneo, M., Clerbaux, B., Drevermann, H., Forty, R W., Frank, M., Gianotti, F., Hansen, J B., Harvey, J., Hutchcroft, D E., Janot, P., Jost, B., Kado, M., Mato, P., Moutoussi, A., Ranjard, F., Rolandi, L., Schlatter, D., Sguazzoni, G., Teubert, F., Valassi, A., Videau, I., Badaud, F., Dessagne, S., Falvard, A., Fayolle, D., Gay, P., Jousset, J., Michel, B., Monteil, S., Pallin, D., Pascolo, J M., Perret, Pascal, Hansen, J D., Hansen, J R., Hansen, P H., Kraan, a C., Nilsson, B S., Kyriakis, A., Markou, C., Simopoulou, E., Vayaki, A., Zachariadou, K., Blondel, A., Brient, J C., Machefert, F., Rouge, A., Videau, H.
Format:	Artikel
Sprache:	eng
Schlagworte:	High Energy Physics - Experiment Physics
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Beschreibung
Zusammenfassung:	Searches for stable, hadronizing scalar quarks and gluinos are performed using the data collected with the ALEPH detector at LEP. Gluon splitting into a gluino or a squark pair is searched for at centre-of-mass energies around the Z resonance, in the e+e- -> q qbar gluino gluino and q qbar squark antisquark processes. Stable squark pair production, and stop pair production with subsequent decays into a stable gluino, stop -> c gluino, are also directly searched for at centre-of-mass energies from 183 to 209\,GeV.Altogether, stable hadronizing stop (sbottom) quarks are excluded up to masses of 95 (92) GeV/c2, and stable hadronizing gluinos are excluded up to 26.9 GeV/c2, at 95% confidence level. In the framework of R-parity-conserving supersymmetric models in which the gluino and the stop quark are the two lightest supersymmetric particles, a 95% C.L. lower limit of 80 GeV/c2 is set on the stop quark mass.
ISSN:	1434-6044 1434-6052
DOI:	10.1140/epjc/s2003-01376-0