Search for chargino and neutralino production in e(+)e(-) collisions at root s=161 GeV

被引：31

作者：

Ackerstaff, K

Alexander, G

Allison, J

Altekamp, N

Ametewee, K

Anderson, KJ

Anderson, S

Arcelli, S

Asai, S

Axen, D

Azuelos, G

Ball, AH

Barberio, E

Barlow, RJ

Bartoldus, R

Batley, JR

Bechtluft, J

Beeston, C

Behnke, T

Bell, AN

Bell, KW

Bella, G

Bentvelsen, S

Berlich, P

Bethke, S

Biebel, O

Blobel, V

Bloodworth, IJ

Bloomer, JE

Bobinski, M

Bock, P

Bosch, HM

Boutemeur, M

Bouwens, BT

Braibant, S

Brown, RM

Burckhart, HJ

Burgard, C

Burgin, R

Capiluppi, P

Carnegie, RK

Carter, AA

Carter, JR

Chang, CY

Charlton, DG

Chrisman, D

Clarke, PEL

Cohen, I

Conboy, JE

Cooke, OC

机构：

[1] UNIV BIRMINGHAM, SCH PHYS & SPACE RES, BIRMINGHAM B15 2TT, W MIDLANDS, ENGLAND

[2] UNIV BOLOGNA, DIPARTMENTO FIS, I-40126 BOLOGNA, ITALY

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

[4] UNIV BONN, INST PHYS, D-53115 BONN, GERMANY

[5] UNIV CALIF RIVERSIDE, DEPT PHYS, RIVERSIDE, CA 92521 USA

[6] CAVENDISH LAB, CAMBRIDGE CB3 0HE, ENGLAND

[7] CARLETON UNIV, OTTAWA CARLETON INST PHYS, DEPT PHYS, OTTAWA, ON K1S 5B6, CANADA

[8] CERN, EUROPEAN ORG PARTICLE PHYS, CH-1211 GENEVA 23, SWITZERLAND

[9] CARLETON UNIV, CTR RES PARTICLE PHYS, OTTAWA, ON K1S 5B6, CANADA

[10] UNIV CHICAGO, ENRICO FERMI INST, CHICAGO, IL 60637 USA

[11] UNIV CHICAGO, DEPT PHYS, CHICAGO, IL 60637 USA

[12] UNIV FREIBURG, FAK PHYS, D-79104 FREIBURG, GERMANY

[13] UNIV HEIDELBERG, INST PHYS, D-69120 HEIDELBERG, GERMANY

[14] INDIANA UNIV, DEPT PHYS, BLOOMINGTON, IN 47405 USA

[15] UNIV LONDON QUEEN MARY & WESTFIELD COLL, LONDON E1 4NS, ENGLAND

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

[17] UNIV MANCHESTER, SCHUSTER LAB, DEPT PHYS, MANCHESTER M13 9PL, LANCS, ENGLAND

[18] UNIV MARYLAND, DEPT PHYS, COLLEGE PK, MD 20742 USA

[19] UNIV MONTREAL, PHYS NUCL LAB, MONTREAL, PQ H3C 3J7, CANADA

[20] UNIV OREGON, DEPT PHYS, EUGENE, OR 97403 USA

[21] RUTHERFORD APPLETON LAB, DIDCOT OX11 0QX, OXON, ENGLAND

[22] TECHNION ISRAEL INST TECHNOL, DEPT PHYS, IL-32000 HAIFA, ISRAEL

[23] TEL AVIV UNIV, DEPT PHYS & ASTRON, IL-69978 TEL AVIV, ISRAEL

[24] UNIV TOKYO, INT CTR ELEMENTARY PARTICLE PHYS, TOKYO 113, JAPAN

[25] KOBE UNIV, KOBE 657, JAPAN

[26] BRUNEL UNIV, UXBRIDGE UB8 3PH, MIDDX, ENGLAND

[27] WEIZMANN INST SCI, PARTICLE PHYS DEPT, IL-76100 REHOVOT, ISRAEL

[28] UNIV HAMBURG, DESY, INST PHYS EXPT, D-22607 HAMBURG, GERMANY

[29] UNIV VICTORIA, DEPT PHYS, VICTORIA, BC V8W 3P6, CANADA

[30] UNIV BRITISH COLUMBIA, DEPT PHYS, VANCOUVER, BC V6T 1Z1, CANADA

[31] UNIV ALBERTA, DEPT PHYS, EDMONTON, AB T6G 2J1, CANADA

[32] DUKE UNIV, DEPT PHYS, DURHAM, NC 27708 USA

[33] RES INST PARTICLE & NUCL PHYS, H-1525 BUDAPEST, HUNGARY

[34] INST NUCL RES, H-4001 DEBRECEN, HUNGARY

[35] UNIV MUNICH, SEKT PHYS, D-85748 GARCHING, GERMANY

来源：

PHYSICS LETTERS B | 1996年 / 389卷 / 03期

基金：

以色列科学基金会; 美国国家科学基金会;

关键词：

D O I：

10.1016/S0370-2693(96)01451-7

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Charginos and neutralinos, predicted by supersymmetric theories, have been searched for in e(+)e(-) collisions with an integrated luminosity of 10.0 pb(-1) at a centre-of-mass energy of root s = 161 GeV with the OPAL detector at LEP. Two candidate events are selected; consistent with the total background estimate of 0.7 +/- 0.2 events. The 95% C.L. lower limit on the lightest chargino mass in the Minimal Supersymmetric Standard Model is 78.5 GeV if the universal scalar mass mo is greater than 1 TeV, and 62.0 GeV for the smallest mo compatible with slepton and sneutrino mass limits obtained at centre-of-mass energies near the Z peak. These limits were obtained under the conditions that the lightest chargino is heavier than the lightest neutralino by more than 10 GeV and tan beta = 1.5. The new exclusion limits significantly improve on the results obtained at root s = 130 and 136 GeV.

引用

页码：616 / 630

页数：15

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