Search for charginos with a small mass difference to the lightest supersymmetric particle at √s=189 GeV

被引：31

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 Milan, I-20133 Milan, Italy

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

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

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

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

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

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

[8] CNRS, IN2P3, LAPP, Lab Annecy Le Vieux Phys Particules, F-74941 Annecy Le Vieux, France

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

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

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

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

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

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

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

[16] Northeastern Univ, Boston, MA 02115 USA

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

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

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

[20] MIT, Cambridge, MA 02139 USA

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

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

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

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

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

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

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

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

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

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

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

[32] CIEMAT, E-28040 Madrid, Spain

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

[34] Inst Theoret & Expt Phys, Moscow, Russia

[35] INFN, Sez Napoli, I-80125 Naples, Italy

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

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

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

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

[40] CALTECH, Pasadena, CA 91125 USA

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

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

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

[44] Princeton Univ, Princeton, NJ 08544 USA

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

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

[47] Russian Acad Sci, Inst Nucl Phys, St Petersburg, Russia

[48] Ist Nazl Fis Nucl, Sez Napoli, I-85100 Potenza, Italy

[49] Unit Potenza, I-85100 Potenza, Italy

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

来源：

PHYSICS LETTERS B | 2000年 / 482卷 / 1-3期

关键词：

D O I：

10.1016/S0370-2693(00)00488-3

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

A search for charginos nearly mass-degenerate with the lightest supersymmetric particle is performed using the 176 pb(-1) of data collected at 189 GeV in 1998 with the L3 detector. Mass differences between the chargino and the lightest supersymmetric particle below 4 GeV are considered. The presence of a high transverse momentum photon is required to single out the signal from the photon-photon interaction background. Na evidence for charginos is found and upper Limits on the cross section for chargino pail production are set, For the first time at LEP2, in the case of heavy scalar leptons, chargino <(chi)over tilde>(+/-)(1) - <(chi)over tilde>(0)(1) mass difference. (C) 2000 Published by Elsevier Science B.V. All rights reserved.

引用

页码：31 / 42

页数：12

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