Search for scalar top and scalar bottom quarks at LEP

被引:39
作者
Abbiendi, G [1 ]
Ainsley, C
Åkesson, PF
Alexander, G
Allison, J
Amaral, P
Anagnostou, G
Anderson, KJ
Arcelli, S
Asai, S
Axen, D
Azuelos, G
Bailey, I
Barberio, E
Barlow, RJ
Batley, RJ
Bechtle, P
Behnke, T
Bell, KW
Bell, PJ
Bella, G
Bellerive, A
Benelli, G
Bethke, S
Biebel, O
Bloodworth, IJ
Boeriu, O
Bock, P
Bonacorsi, D
Boutemeur, M
Braibant, S
Brigliadori, L
Brown, RM
Buesser, K
Burckhart, H
Campana, S
Carnegie, RK
Caron, B
Carter, AA
Carter, JR
Chang, CY
Charlton, DG
Csilling, A
Cuffiani, M
Dado, S
Dallavalle, GM
Dallison, S
De Roeck, A
De Wolf, EA
Desch, K
机构
[1] Univ Bologna, Dipartimento Fis, I-40126 Bologna, Italy
[2] Ist Nazl Fis Nucl, I-40126 Bologna, Italy
[3] Univ Birmingham, Sch Phys & Astron, Birmingham B15 2TT, W Midlands, England
[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 Nucl Res, CH-1211 Geneva 23, Switzerland
[9] Univ Chicago, Enrico Fermi Inst, Chicago, IL 60637 USA
[10] Univ Chicago, Dept Phys, Chicago, IL 60637 USA
[11] Univ Freiburg, Fak Phys, D-79104 Freiburg, Germany
[12] Heidelberg Univ, Dept Phys, D-69120 Heidelberg, Germany
[13] Indiana Univ, Dept Phys, Bloomington, IN 47405 USA
[14] Queen Mary Univ London, London E1 4NS, England
[15] Tech Hsch Aachen, Inst Phys 3, D-52056 Aachen, Germany
[16] UCL, London WC1E 6BT, England
[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, Nucl Phys Lab, Montreal, PQ H3C 3J7, Canada
[20] Univ Oregon, Dept Phys, Eugene, OR 97403 USA
[21] Rutherford Appleton Lab, CLRC, 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 1130033, Japan
[25] Univ Tokyo, Dept Phys, Tokyo 1130033, Japan
[26] Kobe Univ, Kobe, Hyogo 6578501, Japan
[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] Res Inst Particle & Nucl Phys, H-1525 Budapest, Hungary
[33] Inst Nucl Res, H-4001 Debrecen, Hungary
[34] Univ Munich, Sekt Phys, D-85748 Garching, Germany
[35] Max Planck Inst Phys & Astrophys, D-80805 Munich, Germany
基金
以色列科学基金会; 日本学术振兴会; 美国国家科学基金会; 加拿大自然科学与工程研究理事会;
关键词
D O I
10.1016/S0370-2693(02)02593-5
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 quark have been performed using a data sample of 438 pb(-1) at centre-of-mass energies of roots- = 192-209 GeV collected with the OPAL detector at LEP. No evidence for a signal was found. The 95% confidence level lower limit on the scalar top quark mass is 97.6 GeV if the mixing angle between the supersymmetric partners of the left- and right-handed states of the top quark is zero. When the scalar top quark decouples from the Z(0) boson, the lower limit is 95.7 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. The lower limit on the scalar top quark mass is 96.0 GeV for this decay mode, if the mass difference between the scalar top quark and the scalar neutrino is greater than 10 GeV and if the mixing angle of the scalar top quark is zero. From a search for the scalar bottom quark, a mass limit of 96.9 GeV was obtained if the mass difference between the scalar bottom quark and the lightest neutralino is larger than 10 GeV. (C) 2002 Elsevier Science B.V. All rights reserved.
引用
收藏
页码:272 / 284
页数:13
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