Search for scalar top and scalar bottom quarks at √s = 183 GeV at LEP

被引：16

作者：

Ackerstaff, K ^{[1
]}

Alexander, G

Allison, J

Altekamp, N

Anderson, KJ

Anderson, S

Arcelli, S

Asai, S

Axen, D

Azuelos, G

Ball, AH

Barberio, E

Barlow, RJ

Bartoldus, R

Batley, JR

Baumann, S

Bechtluft, J

Beeston, C

Behnke, T

Bell, AN

Bell, KW

Bella, G

Bentvelsen, S

Bethke, S

Biebel, O

Biguzzi, A

Bird, SD

Blobel, V

Bloodworth, IJ

Bloomer, JE

Bobinski, M

Bock, P

Bonacorsi, D

Boutemeur, M

Bouwens, BT

Braibant, S

Brigliadori, L

Brown, RM

Burckhart, HJ

Burgard, C

Bürgin, R

Capiluppi, P

Carnegie, RK

Carter, AA

Carter, JR

Chang, CY

Charlton, DG

Chrisman, D

Clarke, PEL

Cohen, I

机构：

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

[2] Univ Birmingham, Sch Phys & Space Res, Birmingham B15 2TT, W Midlands, England

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

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

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

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

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

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

[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] UCL, London WC1E 6BT, England

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

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

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

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

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

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

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

[25] Univ Tokyo, Int Ctr Elementary Particle Phys, Tokyo 113, Japan

[26] Univ Tokyo, Dept Phys, Tokyo 113, Japan

[27] Kobe Univ, Kobe, Hyogo 657, Japan

[28] Brunel Univ, Uxbridge UB8 3PH, Middx, England

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

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

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

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

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

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

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

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

[37] Univ Munich, Sekt Phys, D-85747 Garching, Germany

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

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

[40] NYU, Dept Phys, New York, NY 10003 USA

来源：

EUROPEAN PHYSICAL JOURNAL C | 1999年 / 6卷 / 02期

关键词：

D O I：

10.1007/s100520050334

中图分类号：

O412 [相对论、场论]; O572.2 [粒子物理学];

学科分类号：

摘要：

Searches for a scalar top quark and a scalar bottom quark have been performed using a total data sample of 56.8 pb(-1) at a centre-of-mass energy of root s = 183 GeV collected with the OPAL detector at LEP. No candidate events were observed. Combining this result with those obtained at lower centre-of-mass energies, the 95% C.L. lower limit on the scalar top quark mass is 85.0 GeV if the mixing angle between the supersymmetric partners of the left- and right-handed states of the top quark is zero. The lower limit is 81.3 GeV, even if the scalar top quark decouples from the Z(0) boson. 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 in which it decays into a bottom quark, a charged lepton and a scalar neutrino was also studied. From a similar analysis, a mass limit on the light scalar bottom quark was set at 82.7 GeV for a mass difference between the scalar bottom quark and the lightest neutralino larger than 7 GeV, and at 84.0 GeV for the mass difference larger 10 GeV and the lightest neutralino heavier than 30 GeV. These limits were obtained assuming that the scalar bottom quark decays into a bottom quark and the lightest neutralino, and that a mixing angle between the supersymmetric partners of the left- and right-handed states of the bottom quark is zero.

引用

页码：225 / 238

页数：14

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