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

被引：28

作者：

Barate, R

Buskulic, D

Decamp, D

Ghez, P

Goy, C

Jezequel, S

Lees, JP

Lucotte, A

Martin, F

Merle, E

Minard, MN

Nief, JY

Pietrzyk, B

Alemany, R

Boix, G

Casado, MP

Chmeissani, M

Crespo, JM

Delfino, M

Fernandez, E

Fernandez-Bosman, M

Garrido, L

Grauges, E

Juste, A

Martinez, M

Merino, G

Miquel, R

Mir, LM

Morawitz, P

Park, IC

Pascual, A

Riu, I

Sanchez, F

Colaleo, A

Creanza, D

de Palma, M

Gelao, G

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

机构：

[1] CNRS, IN2P3, Phys Particules Lab, LAPP, F-74019 Annecy Le Vieux, France

[2] Univ Autonoma Barcelona, Inst Fis Altes Energies, Bellaterra 08193, Barcelona, Spain

[3] Ist Nazl Fis Nucl, Dipartimento Fis, Sez Bari, I-70126 Bari, Italy

[4] Acad Sinica, Inst High Energy Phys, Beijing, Peoples R China

[5] CERN, European Lab Particle Phys, CH-1211 Geneva 23, Switzerland

[6] Univ Clermont Ferrand, Phys Corpusculaire Lab, IN2P3, CNRS, F-63177 Aubiere, France

[7] Niels Bohr Inst, DK-2100 Copenhagen, Denmark

[8] Democritos Nucl Res Ctr, GR-15310 Athens, Greece

[9] Ecole Polytech, CNRS, IN2P3, Lab Phys Nucl & Hautes Energies,Ecole Polytech, F-91128 Palaiseau, France

[10] Univ Florence, Dipartimento Fis, Ist Nazl Fis Nucl, Sez Firenze, I-50125 Florence, Italy

[11] Florida State Univ, Supercomp Computat Res Inst, Tallahassee, FL 32306 USA

[12] Ist Nazl Fis Nucl, Lab Nazl Frascati, I-00044 Frascati, Italy

[13] Univ Glasgow, Dept Phys & Astron, Glasgow G12 8QQ, Lanark, Scotland

[14] Univ Heidelberg, Inst Hochenergiephys, D-69120 Heidelberg, Germany

[15] Univ London Imperial Coll Sci Technol & Med, Dept Phys, London SW7 2BZ, England

[16] Univ Innsbruck, Inst Expt Phys, A-6020 Innsbruck, Austria

[17] Univ Lancaster, Dept Phys, Lancaster LA1 4YB, England

[18] Johannes Gutenberg Univ Mainz, Inst Phys, D-55099 Mainz, Germany

[19] Fac Sci Luminy, Ctr Phys Particules, IN2P3, CNRS, F-13288 Marseille, France

[20] Univ Milan, Dipartimento Fis, I-20133 Milan, Italy

[21] Ist Nazl Fis Nucl, Sez Milano, I-20133 Milan, Italy

[22] Max Planck Inst Phys & Astrophys, Werner Heisenberg Inst, D-80805 Munich, Germany

[23] Univ Paris 11, Accelerateur Lineaire Lab, IN2P3, CNRS, F-91898 Orsay, France

[24] Univ Pisa, Sez Pisa, Dipartimento Fis, Ist Nazl Fis Nucl, I-56010 Pisa, Italy

[25] Scuola Normale Super Pisa, I-56010 Pisa, Italy

[26] Univ London, Royal Holloway & Bedford New Coll, Dept Phys, Surrey TW20 0EX, England

[27] Rutherford Appleton Lab, Particle Phys Dept, Didcot OX11 0QX, Oxon, England

[28] CE Saclay, Serv Phys Particules, CEA, DAPNIA, F-91191 Gif Sur Yvette, France

[29] Univ Calif Santa Cruz, Inst Particle Phys, Santa Cruz, CA 95064 USA

[30] Univ Sheffield, Dept Phys, Sheffield S3 7RH, S Yorkshire, England

[31] Univ Siegen, Fachbereich Phys, D-57068 Siegen, Germany

[32] Univ Trieste, Dipartimento Fis, I-34127 Trieste, Italy

[33] Ist Nazl Fis Nucl, Sez Trieste, I-34127 Trieste, Italy

[34] Univ Washington, Seattle, WA 98195 USA

[35] Univ Wisconsin, Dept Phys, Madison, WI 53706 USA

[36] Univ Barcelona, Barcelona 08208, Spain

[37] Ist Nazl Fis Nucl, Dipartimento Fis, Sez Catania, I-95129 Catania, Italy

[38] Univ Turin, Ist Fis Gen, I-10124 Turin, Italy

[39] CNR, Ist Cosmogeofis, I-10133 Turin, Italy

[40] Kangnung Natl Univ, Kangnung, South Korea

来源：

PHYSICS LETTERS B | 1998年 / 434卷 / 1-2期

关键词：

D O I：

10.1016/S0370-2693(98)00662-5

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

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 root s = 181-184 GeV. No evidence for scalar top, scalar bottom or degenerate scalar quarks was found in the channels (t) over tilde --> c chi, (t) over tilde --> bl (v) over tilde, (b) over tilde --> b chi, and (q) over tilde chi. From the channel (t) over tilde --> c chi a limit of 74 GeV/c(2) has been set on the scalar top quark mass, independent of the mixing angle. This limit assumes a mass difference between the (t) over tilde and the chi in the range 10-40 GeV/c(2). From the channel (t) over tilde --> bl<(nu)over tilde> the mixing-angle-independent scalar top limit is 82 GeV/c(2), assuming m((t) over tilde) - m(<(nu)over tilde>) 10 GeV/c(2). From the channel (b) over tilde --> b chi, a limit of 79 GeV/c(2) has been set on the mass of the supersymmetric partner of the left-handed state of the bottom quark. This limit is valid for m((b) over tilde) - m(x) > 10 GeV/c(2). From the channel (q) over tilde --> q chi, a limit of 87 GeV/c(2) 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 in m((q) over tilde) - m(x) > 5 CeV/c(2). (C) 1998 Published by Elsevier Science B.V. All rights reserved.

引用

页码：189 / 199

页数：11

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