Searches for charginos and neutralinos in e+e- collisions at √s=161 and 172 GeV

被引：27

作者：

Barate, R ^{[1
]}

Buskulic, D

Decamp, D

Ghez, P

Goy, C

Lees, JP

Lucotte, A

Minard, MN

Nief, JY

Pietrzyk, B

Casado, MP

Chmeissani, M

Comas, P

Crespo, JM

Delfino, M

Fernandez, E

Fernandez-Bosman, M

Garrido, L

Juste, A

Martinez, M

Merino, G

Miquel, R

Mir, LM

Padilla, C

Park, IC

Pascual, A

Perlas, JA

Riu, I

Sanchez, F

Colaleo, A

Creanza, D

de Palma, M

Gelao, G

Iaselli, G

Maggi, G

Maggi, M

Marinelli, N

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

机构：

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

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

[3] Ist Nazl Fis Nucl, Dipartimento Fis, 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 2, CNRS, IN2P3, Phys Corpusculaire Lab, F-63177 Clermont Ferrand, France

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

[8] Democritos Nucl Res Ctr, Athens, Greece

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

[10] Univ Florence, Dipartimento Fis, INFN, Sez Firenze, I-50125 Florence, Italy

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

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

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

[14] Heidelberg Univ, 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] INFN, Sez Milano, I-20133 Milan, Italy

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

[23] Univ Paris Sud, IN2P3, CNRS, Lab Accelerateur Lineaire, F-91405 Orsay, France

[24] Univ Pisa, Dipartimento Fis, INFN, Sez Pisa, I-56010 Pisa, Italy

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

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

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

[28] Ctr Etud Saclay, CEA, DAPNIA, Serv Phys Particules, 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, Dipartmento Fis, I-34127 Trieste, Italy

[33] INFN, Sez Trieste, I-34127 Trieste, Italy

[34] Univ Washington, Seattle, WA 98195 USA

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

[36] Kangnung Natl Univ, Kangnung, South Korea

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

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

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

[40] Univ Barcelona, Barcelona 08208, Spain

来源：

EUROPEAN PHYSICAL JOURNAL C | 1998年 / 2卷 / 03期

关键词：

D O I：

10.1007/s100520050151

中图分类号：

O412 [相对论、场论]; O572.2 [粒子物理学];

学科分类号：

摘要：

The data recorded by the ALEPH detector at centre-of-mass energies of 161, 170, and 172 GeV are analysed for signals of chargino and neutralino production. No evidence of a signal is found, although candidate events consistent with the expectations from Standard Model processes are observed. Limits at 95% C.L. on the production cross sections are derived and bounds on the parameters of the Minimal Supersymmetric Standard Model are set. The lower limit on the mass of the lightest chargino is 85.5 GeV/c(2) for gaugino-like charginos (mu = -500 GeV/c(2)), and 85.0 GeV/c(2) for Higgsino-like charginos (M-2 = 500 GeV/c(2)), for heavy sneutrinos (M(<(nu)over tilde>) greater than or equal to 200 GeV/c(2)) and tan beta = root 2. The effect of light sleptons on chargino and neutralino limits is investigated. The assumptions of a universal slepton mass and a universal gaugino mass are relaxed, allowing less model-dependent limits to be obtained.

引用

页码：417 / 439

页数：23

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