SEARCH FOR NEUTRALINOS IN Z-DECAYS

被引：53

作者：

ACCIARRI, M

ADAM, A

ADRIANI, O

AGUILARBENITEZ, M

AHLEN, S

ALPAT, B

ALCARAZ, J

ALLABY, J

ALOISIO, A

ALVERSON, G

ALVIGGI, MG

AMBROSI, G

AN, Q

ANDERHUB, H

ANDERSON, AL

ANDREEV, VP

ANGELESCU, T

ANTREASYAN, D

ALKHAZOV, G

AREFIEV, A

AZEMOON, T

AZIZ, T

BABA, PVKS

BAGNAIA, P

BAKKEN, JA

BAKSAY, L

BALL, RC

BANERJEE, S

BANICZ, K

BARILLERE, R

BARONE, L

BARTALINI, P

BASCHIROTTO, A

BASILE, M

BATTISTON, R

BAY, A

BECATTINI, F

BECKER, U

BEHNER, F

BENCZE, GL

BERDUGO, J

BERGES, P

BERTUCCI, B

BETEV, BL

BIASINI, M

BILAND, A

BILEI, GM

BIZZARRI, R

BLAISING, JJ

BOBBINK, GJ

机构：

[1] RHEIN WESTFAL TH AACHEN, INST PHYS 1, D-52056 AACHEN, GERMANY

[2] RHEIN WESTFAL TH AACHEN, INST PHYS 3, D-52056 AACHEN, GERMANY

[3] NIKHEF H, NATL INST HIGH ENERGY PHYS, 1009 DB AMSTERDAM, NETHERLANDS

[4] UNIV MICHIGAN, ANN ARBOR, MI 48109 USA

[5] LAB ANNECY LE VIEUX PHYS PARTICULES, LAPP, IN2P3, CNRS, F-74941 ANNECY LE VIEUX, FRANCE

[6] JOHNS HOPKINS UNIV, BALTIMORE, MD 21218 USA

[7] INST HIGH ENERGY PHYS, BEIJING 100039, PEOPLES R CHINA

[8] HUMBOLDT UNIV BERLIN, D-10099 BERLIN, GERMANY

[9] IST NAZL FIS NUCL, I-40126 BOLOGNA, ITALY

[10] TATA INST FUNDAMENTAL RES, BOMBAY 400005, MAHARASHTRA, INDIA

[11] BOSTON UNIV, BOSTON, MA 02215 USA

[12] NORTHWESTERN UNIV, BOSTON, MA 02215 USA

[13] INST ATOM PHYS, R-76900 BUCHAREST, ROMANIA

[14] UNIV BUCHAREST, R-76900 BUCHAREST, ROMANIA

[15] HUNGARIAN ACAD SCI, CENT RES INST PHYS, H-1525 BUDAPEST 114, HUNGARY

[16] HARVARD UNIV, CAMBRIDGE, MA 02139 USA

[17] MIT, CAMBRIDGE, MA 02139 USA

[18] IST NAZL FIS NUCL, I-50125 FLORENCE, ITALY

[19] UNIV FLORENCE, I-50125 FLORENCE, ITALY

[20] CERN, EUROPEAN LAB PARTICLE PHYS, CH-1211 GENEVA 23, SWITZERLAND

[21] WORLD LAB, FBLJA PROJECT, CH-1211 GENEVA 23, SWITZERLAND

[22] UNIV GENEVA, CH-1211 GENEVA 4, SWITZERLAND

[23] UNIV SCI & TECHNOL CHINA, HEFEI 230029, PEOPLES R CHINA

[24] SEFT, HIGH ENERGY PHYS RES INST, SF-00014 HELSINKI, FINLAND

[25] UNIV LAUSANNE, CH-1015 LAUSANNE, SWITZERLAND

[26] LOS ALAMOS NATL LAB, LOS ALAMOS, NM 87544 USA

[27] UNIV LYON 1, INST PHYS NUCL LYON, IN2P3, CNRS, F-69622 VILLEURBANNE, FRANCE

[28] CIEMAT, E-28040 MADRID, SPAIN

[29] IST NAZL FIS NUCL, I-20133 MILAN, ITALY

[30] INST THEORET & EXPTL PHYS, MOSCOW 117259, RUSSIA

[31] IST NAZL FIS NUCL, I-80125 NAPLES, ITALY

[32] UNIV NAPLES, I-80125 NAPLES, ITALY

[33] UNIV CYPRUS, DEPT NAT SCI, NICOSIA, CYPRUS

[34] CATHOLIC UNIV NIJMEGEN, 6525 ED NIJMEGEN, NETHERLANDS

[35] NATL INST NUCL PHYS & HIGH ENERGY PHYS, 6525 ED NIJMEGEN, NETHERLANDS

[36] OAK RIDGE NATL LAB, OAK RIDGE, TN 37831 USA

[37] CALTECH, PASADENA, CA 91125 USA

[38] IST NAZL FIS NUCL, I-06100 PERUGIA, ITALY

[39] UNIV PERUGIA, I-06100 PERUGIA, ITALY

[40] CARNEGIE MELLON UNIV, PITTSBURGH, PA 15213 USA

[41] PRINCETON UNIV, PRINCETON, NJ 08544 USA

[42] IST NAZL FIS NUCL, I-00185 ROME, ITALY

[43] UNIV ROME, I-00185 ROME, ITALY

[44] INST PHYS NUCL LYON, ST PETERSBURG, RUSSIA

[45] UNIV CALIF SAN DIEGO, SAN DIEGO, CA 92093 USA

[46] UNIV SANTIAGO, DEPT FIS PARTICULAS ELEMENTALES, E-15706 SANTIAGO, SPAIN

[47] BULGARIAN ACAD SCI, CENT LAB MECHATRON & INSTRUMENTAT, BU-1113 SOFIA, BULGARIA

[48] KOREA ADV INST SCI & TECHNOL, CTR HIGH ENERGY PHYS, TAEJON 305701, SOUTH KOREA

[49] UNIV ALABAMA, TUSCALOOSA, AL 35486 USA

[50] PURDUE UNIV, W LAFAYETTE, IN 47907 USA

来源：

PHYSICS LETTERS B | 1995年 / 350卷 / 01期

基金：

美国安德鲁·梅隆基金会;

关键词：

D O I：

10.1016/0370-2693(95)00260-R

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We have searched for neutralinos produced via the reactions e(+)e(-) --> chi chi', and e(+)e(-) --> chi'chi', where the next-to lightest neutralino, chi', decays into the lightest neutralino, chi and either a photon or a fermion pair, Based on 1.8 X 10(6) hadronic Z decays collected with the L3 detector at LEP, no signal has been observed. We present upper limits of a few times 10(-5) on the branching ratios Z --> chi chi' and Z --> chi chi'. In the framework of the Minimial Supersymmetric Standard Model, we exclude a lightest chi with m(chi) less than 18 GeV, if either tan beta > 2 or the gluino mass m(g) > 100 GeV.

引用

页码：109 / 119

页数：11

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