Search for scalar quarks in e+e- collisions at √s up to 209 GeV

被引:60
作者
Heister, A [1 ]
Schael, S
Barate, R
Brunelière, R
De Bonis, I
Decamp, D
Goy, C
Jezequel, S
Lees, JP
Martin, F
Merle, E
Minard, MN
Pietrzyk, B
Trocmé, B
Boix, G
Bravo, S
Casado, MP
Chmeissani, M
Crespo, JM
Fernandez, E
Fernandez-Bosman, M
Garrido, L
Graugés, E
Lopez, J
Martinez, M
Merino, G
Miquel, R
Mir, LM
Pacheco, A
Paneque, D
Ruiz, H
Colaleo, A
Creanza, D
De Filippis, N
de Palma, M
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, J
Ouyang, Q
机构
[1] Rhein Westfal TH Aachen, Inst Phys, D-52056 Aachen, Germany
[2] IN2P3, CNRS, Phys Particules Lab, F-74019 Annecy Le Vieux, France
[3] Univ Autonoma Barcelona, Inst Fis Altes Energies, E-08193 Barcelona, Spain
[4] Univ Bari, Dipartmento Fis, Sez Bari, I-70126 Bari, Italy
[5] Acad Sinica, Inst High Energy Phys, Beijing, Peoples R China
[6] CERN, European Lab Particle Phys, CH-1211 Geneva 23, Switzerland
[7] Univ Clermont Ferrand, IN2P3, CNRS, Phys Corpusculaire Lab, F-63177 Clermont Ferrand, France
[8] Niels Bohr Inst, DK-2100 Copenhagen, Denmark
[9] Democritos Nucl Res Ctr, GR-15310 Athens, Greece
[10] Ecole Polytech, CNRS, IN2P3, Lab Phys Nucl & Hautes Energies, F-91128 Palaiseau, France
[11] Univ Florence, Dipartimento Fis, Ist Nazl Fis Nucl, Sez Firenze, I-50125 Florence, Italy
[12] Ist Nazl Fis Nucl, Lab Nazl Frascati, I-00044 Frascati, Italy
[13] Univ Glasgow, Dept Phys & Astron, Glasgow G12 8QQ, Lanark, Scotland
[14] Haverford Coll, Dept Phys, Haverford, PA 19041 USA
[15] Heidelberg Univ, Kirchhoff Inst Phys, D-69120 Heidelberg, Germany
[16] Univ London Imperial Coll Sci Technol & Med, Dept Phys, London SW7 2BZ, England
[17] Univ Innsbruck, Inst Expt Phys, A-6020 Innsbruck, Austria
[18] Univ Lancaster, Dept Phys, Lancaster LA1 4YB, England
[19] Catholic Univ Louvain, Inst Phys Nucl, Dept Phys, B-1348 Louvain, Belgium
[20] Johannes Gutenberg Univ Mainz, Inst Phys, D-55099 Mainz, Germany
[21] Univ Mediterranee, IN2P3, CNRS, Ctr Phys Particules Marseille, F-13288 Marseille, France
[22] Univ Milan, Dipartimento Fis, I-20133 Milan, Italy
[23] Ist Nazl Fis Nucl, Sez Milano, I-20133 Milan, Italy
[24] Max Planck Inst Phys & Astrophys, Werner Heisenberg Inst, D-80805 Munich, Germany
[25] Univ Paris 11, IN2P3, CNRS, Lab Accelerateur Lineaire, F-91898 Orsay, France
[26] Univ Pisa, Dipartimento Fis, I-56010 Pisa, Italy
[27] Ist Nazl Fis Nucl, Sez Pisa, I-56010 Pisa, Italy
[28] Scuola Normale Super Pisa, I-56010 Pisa, Italy
[29] Univ London, Royal Holloway & Bedford New Coll, Dept Phys, Egham TW20 0EX, Surrey, England
[30] Rutherford Appleton Lab, Particle Phys Dept, Didcot OX11 0QX, Oxon, England
[31] CEA, DAPNIA, Serv Phys Particules, CE Saclay, F-91191 Gif Sur Yvette, France
[32] Univ Calif Santa Cruz, Inst Particle Phys, Santa Cruz, CA 95064 USA
[33] Univ Sheffield, Dept Phys, Sheffield S3 7RH, S Yorkshire, England
[34] Univ Siegen, Fachbereich Phys, D-57068 Siegen, Germany
[35] Univ Trieste, Dipartmento Fis, I-34127 Trieste, Italy
[36] Ist Nazl Fis Nucl, Sez Trieste, I-34127 Trieste, Italy
[37] Univ Washington, Seattle, WA 98195 USA
[38] Univ Wisconsin, Dept Phys, Madison, WI 53706 USA
[39] ETH Honggerberg, Inst Particle Phys, CH-8093 Zurich, Switzerland
[40] Univ Catania, Dipartmento Fis, I-95129 Catania, Italy
[41] Ist Nazl Fis Nucl, Sez Catania, I-95129 Catania, Italy
[42] CNR, Ist Cosmogeofis, I-10133 Turin, Italy
[43] Univ Palermo, Dipartimento Fis & Tecnol Relat, Palermo, Italy
[44] Univ Barcelona, Barcelona 08208, Spain
[45] Tsinghua Univ, Dept Phys, Beijing 100084, Peoples R China
[46] Univ Montpellier 2, Grp Astroparticules Montpellier, F-34095 Montpellier, France
关键词
D O I
10.1016/S0370-2693(02)01827-0
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
Searches for scalar top, scalar bottom and mass-degenerate scalar quarks are performed in the data collected by the ALEPH detector at LEP. at centre-of-mass energies up to 209 GeV, corresponding to an integrated luminosity of 675 pb(-1). No evidence for the production of such particles is found in the decay channels (t) over tilde -->C/uchi, (t) over tilde -->bl (nu) over tilde, (q) over tilde -->bchi, ($) over tilde -->qchi or in the stop four-body decay channel (t) over tilde -->bchif (f) over bar' studied for the first time at LEP. The results of these searches yield improved mass lower limits. In particular, an absolute lower limit of 63 GeV/c(2) is obtained for the stop mass, at 95% confidence level, irrespective of the stop lifetime and decay branching ratios. (C) 2002 Elsevier Science B.V All rights reserved.
引用
收藏
页码:5 / 20
页数:16
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