Search for scalar top and scalar bottom quarks at √s=189 GeV at LEP

被引：43

作者：

Abbiendi, G ^{[1
]}

Ackerstaff, K

Alexander, G

Allison, J

Altekamp, N

Anderson, KJ

Anderson, S

Arcelli, S

Asai, S

Ashby, SF

Axen, D

Azuelos, G

Ball, AH

Barberio, E

Barlow, RJ

Batley, JR

Baumann, S

Bechtluft, J

Behnke, T

Bell, KW

Bella, G

Bellerive, A

Bentvelsen, S

Bethke, S

Betts, S

Biebel, O

Biguzzi, A

Blobel, V

Bloodworth, IJ

Bock, P

Böhme, J

Bonacorsi, D

Boutemeur, M

Braibant, S

Bright-Thomas, P

Brigliadori, L

Brown, RM

Burckhart, HJ

Capiluppi, P

Carnegie, RK

Carter, AA

Carter, JR

Chang, CY

Charlton, DG

Chrisman, D

Ciocca, C

Clarke, PEL

Clay, E

Cohen, I

Conboy, JE

机构：

[1] Univ Bologna, Dipartmento Fis, I-40126 Bologna, Italy

[2] Univ Bologna, Dipartimento Fis, I-40126 Bologna, Italy

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

[4] Univ Bonn, Phys Inst, D-53115 Bonn, Germany

[5] Univ Calif Riverside, Dept Phys, Riverside, CA 92521 USA

[6] Univ Cambridge, Cavendish Lab, Cambridge CB3 0HE, England

[7] Carleton Univ, Dept Phys, Ottawa Carleton Inst Phys, Ottawa, ON K1S 5B6, Canada

[8] Carleton Univ, Ctr Res Particle Phys, Ottawa, ON K1S 5B6, Canada

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

[10] Univ Birmingham, Sch Phys & Astron, Birmingham B15 2TT, W Midlands, England

[11] Univ Chicago, Enrico Fermi Inst, Chicago, IL 60637 USA

[12] Univ Chicago, Dept Phys, Chicago, IL 60637 USA

[13] Univ Freiburg, Fak Phys, D-79104 Freiburg, Germany

[14] Heidelberg Univ, Inst Phys, D-69120 Heidelberg, Germany

[15] Indiana Univ, Dept Phys, Bloomington, IN 47405 USA

[16] Queen Mary Univ London, London E1 4NS, England

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

[18] UCL, London WC1E 6BT, England

[19] Univ Manchester, Dept Phys, Schuster Lab, Manchester M13 9PL, Lancs, England

[20] Univ Maryland, Dept Phys, College Pk, MD 20742 USA

[21] Univ Montreal, Phys Nucl Lab, Montreal, PQ H3C 3J7, Canada

[22] Univ Oregon, Dept Phys, Eugene, OR 97403 USA

[23] Rutherford Appleton Lab, CLRC, Didcot OX11 0QX, Oxon, England

[24] Technion Israel Inst Technol, Dept Phys, IL-32000 Haifa, Israel

[25] Tel Aviv Univ, Dept Phys & Astron, IL-69978 Tel Aviv, Israel

[26] Univ Tokyo, Int Ctr Elementary Particle Phys, Tokyo 1130033, Japan

[27] Univ Tokyo, Dept Phys, Tokyo 1130033, Japan

[28] Kobe Univ, Kobe, Hyogo 6578501, Japan

[29] Brunel Univ, Inst Phys & Environm Sci, Uxbridge UB8 3PH, Middx, England

[30] Weizmann Inst Sci, Particle Phys Dept, IL-76100 Rehovot, Israel

[31] Univ Hamburg, DESY, Inst Expt Phys 2, D-22607 Hamburg, Germany

[32] Univ Victoria, Dept Phys, Victoria, BC V8W 3P6, Canada

[33] Univ British Columbia, Dept Phys, Vancouver, BC V6T 1Z1, Canada

[34] Univ Alberta, Dept Phys, Edmonton, AB T6G 2J1, Canada

[35] Duke Univ, Dept Phys, Durham, NC 27708 USA

[36] Res Inst Particle & Nucl Phys, H-1525 Budapest, Hungary

[37] Inst Nucl Res, H-4001 Debrecen, Hungary

[38] Univ Munich, Sekt Phys, D-85748 Garching, Germany

[39] TRIUMF, Vancouver, BC V6T 2A3, Canada

[40] Lajos Kossuth Univ, Dept Expt Phys, Debrecen, Hungary

[41] Stanislaw Staszic Univ Min & Met, PL-30059 Krakow, Poland

来源：

PHYSICS LETTERS B | 1999年 / 456卷 / 01期

关键词：

D O I：

10.1016/S0370-2693(99)00440-2

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Searches for a scalar top quark and a scalar bottom quack have been performed using a data sample of 182 pb-l at a centre-of-mass energy of root s = 189 GeV collected with the OPAL detector at LEP. No evidence for a signal was found. The 95% confidence level (C.L.) lower limit on the scalar top quark mass is 90.3 GeV if the mixing angle between the supersymmetric partners of the left- and right-handed st;states of the top quark is zero. In the worst case, when the scalar top quark decouples from the Z(0) boson, the lower limit is 87.2 GeV. These limits were obtained assuming that the scalar top quark decays into a charm quark and the lightest neutralino, and that the mass difference between the scalar top quark and the lightest neutralino is larger than 10 GeV. The complementary decay mode of the scalar top quark decaying into a bottom quark, a charged lepton and a scalar neutrino has also been studied. From a search for the scalar bottom quark, a mass limit of 88.6 GeV was obtained if the mass difference between the scalar bottom quark and the lightest neutralino is larger than 7 GeV. These limits significantly improve the previous OPAL limits. (C) 1999 Elsevier Science B.V. All rights reserved.

引用

页码：95 / 106

页数：12

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