Search for a scalar top almost degenerate with the lightest neutralino e+e- collisions at √s up to 202 GeV

被引：17

作者：

Barate, R ^{[1
]}

Decamp, D

Ghez, P

Goy, C

Jezequel, S

Lees, JP

Martin, F

Merle, E

Minard, MN

Pietrzyk, B

Bravo, S

Casado, MP

Chmeissani, M

Crespo, JM

Fernandez, E

Fernandez-Bosman, M

Garrido, L

Graugés, E

Lopez, J

Martinez, M

Merino, C

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

Wang, T

Xie, Y

Xu, R

Xue, S

Zhang, J

机构：

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

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

[3] Ist Nazl Fis Nucl, Dipartimento Fis, Sezione 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 Lancaster, Dept Phys, Lancaster LA1 4YB, England

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

[8] Univ Mediterranee, CNRS, IN2P3, Ctr Phys Particules Marseille, F-13288 Marseille, France

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

[10] Ist Nazl Fis Nucl, Sezione Milano, I-20133 Milan, Italy

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

[12] Univ Paris Sud, Lab Accelerateur Lineaire, IN2P3, CNRS, F-91898 Orsay, France

[13] Univ Pisa, Dipartimento Fis, Ist Nazl Fis Nucl, Sezione Pisa, I-56010 Pisa, Italy

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

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

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

[17] CENS, Serv Phys Particules, DAPNIA, CEA, F-91191 Gif Sur Yvette, France

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

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

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

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

[22] Ist Nazl Fis Nucl, Sezione Trieste, I-34127 Trieste, Italy

[23] Univ Washington, Seattle, WA 98195 USA

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

[25] CERN, CH-1211 Geneva 23, Switzerland

[26] Dipartimento Fis Catania, I-95129 Catania, Italy

[27] Ist Nazl Fis Nucl, Sezione Catania, I-95129 Catania, Italy

[28] Univ Turin, Ist Fis Gen, I-10125 Turin, Italy

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

来源：

PHYSICS LETTERS B | 2000年 / 488卷 / 3-4期

关键词：

D O I：

10.1016/S0370-2693(00)00893-5

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Data collected at centre-of-mass energies from 189 GeV to 202 GeV by the ALEPH detector at LEP corresponding to an integrated luminosity of 411 pb(-1), are analysed in a search for the scalar top in the decay channels (t) over tilde --> c/u chi for small mass differences between the stop and the lightest neutralino. No evidence for deviations from the Standard Model expectation is found and a lower limit of 59 GeV/c(2) is set for the stop mass, independent of the stop to neutralino mass difference and of the stop lifetime. (C) 2000 Elsevier Science B.V. All rights reserved.

引用

页码：234 / 246

页数：13

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