Search for charginos and neutralinos in e+e- collisions at √s=189 GeV

被引：60

作者：

Acciarri, M ^{[1
]}

Achard, P

Adriani, O

Aguilar-Benitez, M

Alcaraz, J

Alemanni, G

Allaby, J

Aloisio, A

Alviggi, MG

Ambrosi, G

Anderhub, H

Andreev, VP

Angelescu, T

Anselmo, F

Arefiev, A

Azemoon, T

Aziz, T

Bagnaia, P

Baksay, L

Balandras, A

Ball, RC

Banerjee, S

Barczyk, A

Barillère, R

Barone, L

Bartalini, P

Basile, M

Battiston, R

Bay, A

Becattini, F

Becker, U

Behner, F

Bellucci, L

Berdugo, J

Berges, P

Bertucci, B

Betev, BL

Bhattacharya, S

Biasini, M

Biland, A

Blaising, JJ

Blyth, SC

Bobbink, GJ

Böhm, A

Boldizsar, L

Borgia, B

Bourilkov, D

Bourquin, M

Braccini, S

机构：

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

[2] Rhein Westfal TH Aachen, Inst Phys 1, D-52056 Aachen, Germany

[3] Rhein Westfal TH Aachen, Inst Phys 3, D-52056 Aachen, Germany

[4] NIKHEF H, Natl Inst High Energy Phys, NL-1009 DB Amsterdam, Netherlands

[5] Univ Amsterdam, NL-1009 DB Amsterdam, Netherlands

[6] Univ Michigan, Ann Arbor, MI 48109 USA

[7] CNRS, Lab Annecy Vieux Phys Particles, LAPP, IN2P3, F-74941 Annecy Le Vieux, France

[8] Univ Basel, Inst Phys, CH-4056 Basel, Switzerland

[9] Louisiana State Univ, Baton Rouge, LA 70803 USA

[10] Inst High Energy Phys, Beijing 100039, Peoples R China

[11] Humboldt Univ, D-10099 Berlin, Germany

[12] Univ Bologna, I-40126 Bologna, Italy

[13] Ist Nazl Fis Nucl, Sez Bologna, I-40126 Bologna, Italy

[14] Tata Inst Fundamental Res, Bombay 400005, Maharashtra, India

[15] Northeastern Univ, Boston, MA 02115 USA

[16] Inst Atom Phys, R-76900 Bucharest, Romania

[17] Univ Bucharest, R-76900 Bucharest, Romania

[18] Hungarian Acad Sci, Cent Res Inst Phys, H-1525 Budapest 114, Hungary

[19] MIT, Cambridge, MA 02139 USA

[20] Univ Debrecen, ATOMKI, H-4010 Debrecen, Hungary

[21] Ist Nazl Fis Nucl, Sez Firenze, I-50125 Florence, Italy

[22] Univ Florence, I-50125 Florence, Italy

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

[24] World Lab, FBLJA Project, CH-1211 Geneva 23, Switzerland

[25] Univ Geneva, CH-1211 Geneva 4, Switzerland

[26] Chinese Univ Sci & Technol, Hefei 230029, Anhui, Peoples R China

[27] SEFT, Res Inst High Energy Phys, SF-00014 Helsinki, Finland

[28] Univ Lausanne, CH-1015 Lausanne, Switzerland

[29] Ist Nazl Fis Nucl, Sez Lecce, I-73100 Lecce, Italy

[30] Univ Lecce, I-73100 Lecce, Italy

[31] Univ Lyon 1, Inst Phys Nucl Lyon, IN2P3, CNRS, F-69622 Villeurbanne, France

[32] CIEMAT, E-28040 Madrid, Spain

[33] Inst Theoret & Expt Phys, Moscow 117259, Russia

[34] Ist Nazl Fis Nucl, Sez Napoli, I-80125 Naples, Italy

[35] Univ Naples Federico II, I-80125 Naples, Italy

[36] Univ Cyprus, Dept Nat Sci, Nicosia, Cyprus

[37] Catholic Univ Nijmegen, NL-6525 ED Nijmegen, Netherlands

[38] Natl Inst Nucl Phys & High Energy Phys, NL-6525 ED Nijmegen, Netherlands

[39] CALTECH, Pasadena, CA 91125 USA

[40] Ist Nazl Fis Nucl, Sez Perugia, I-06100 Perugia, Italy

[41] Univ Perugia, I-06100 Perugia, Italy

[42] Carnegie Mellon Univ, Pittsburgh, PA 15213 USA

[43] Princeton Univ, Princeton, NJ 08544 USA

[44] Ist Nazl Fis Nucl, Sez Roma, I-00185 Rome, Italy

[45] Univ Roma La Sapienza, I-00185 Rome, Italy

[46] Inst Nucl Phys, St Petersburg, Russia

[47] Univ Salerno, I-84100 Salerno, Italy

[48] Ist Nazl Fis Nucl, I-84100 Salerno, Italy

[49] Univ Calif San Diego, La Jolla, CA 92093 USA

[50] Univ Santiago, Dept Fis Particulas Elementales, E-15706 Santiago De Compostela, Spain

来源：

PHYSICS LETTERS B | 2000年 / 472卷 / 3-4期

关键词：

D O I：

10.1016/S0370-2693(99)01388-X

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We report the result of a search for charginos and neutralinos, in e(+)e(-) collisions at 189 GeV centre-of-mass energy at LEP, No evidence for such particles is found in a data sample of 176 pb(-1). Improved upper limits for these particles are set on the production cross sections. New exclusion contours in the parameter space of the Minimal Supersymmetric Standard Model are derived, as well as new lower limits on the masses of these supersymmetric particles. Under the assumptions of common gaugino and scalar masses at the GUT scale, we set an absolute lower limit on the mass of the lightest neutralino of 32.5 GeV, and a limit on the mass of the lightest chargino of 67.7 GeV for M-2 < 2TeV. (C) 2000 Published by Elsevier Science B.V. All rights reserved.

引用

页码：420 / 433

页数：14

共 48 条

[41] SUPERSYMMETRY, SUPERGRAVITY AND PARTICLE PHYSICS [J].