W boson polarisation at LEP2

被引：24

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

Barillari, T

Barlow, RJ

Batley, RJ

Bechtle, P

Behnke, T

Bell, KW

Bell, PJ

Bella, G

Bellerive, A

Benelli, G

Bethke, S

Biebel, O

Boeriu, O

Bock, P

Boutemeur, M

Braibant, S

Brigliadori, L

Brown, RM

Buesser, K

Burckhart, HJ

Campana, S

Carnegie, RK

Carter, AA

Carter, JR

Chang, CY

Charlton, DG

Ciocca, C

Couchman, J

Csilling, A

Cuffiani, M

Dado, S

De Roeck, A

De Wolf, EA

Desch, K

Dienes, B

Donkers, M

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] Univ Cambridge, Dept Phys, Cambridge CB3 0HE, England

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

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

[9] CERN, European Org Nucl Res, CH-1211 Geneva 23, Switzerland

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

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

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

[16] Tech Hsch 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, Nucl Phys Lab, Montreal, PQ H3C 3J7, Canada

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

[22] Rutherford Appleton Lab, CCLRC, 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 1130033, Japan

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

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

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

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

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

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

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

[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

[36] Max Planck Inst Phys & Astrophys, D-80805 Munich, Germany

[37] Yale Univ, Dept Phys, New Haven, CT 06520 USA

来源：

PHYSICS LETTERS B | 2004年 / 585卷 / 3-4期

关键词：

D O I：

10.1016/j.physletb.2004.02.003

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Elements of the spin density matrix for W bosons in e(+)e(-) --> W+W- --> q (q) over barq'lv(l) events are measured from data recorded by the OPAL detector at LEP. This information is used to calculate polarised differential cross-sections and to search for CP-violating effects. Results are presented for W bosons produced in e+e- Collisions with centre-of-mass energies between 183 GeV and 209 GeV. The average fraction of W bosons that are longitudinally polarised is found to be (23.9 +/- 2.1 +/- 1.1)% compared to a Standard Model prediction of (23.9 +/- 0.1)%. All results are consistent with CP conservation. (C) 2004 Elsevier B.V. All rights reserved.

引用

页码：223 / 236

页数：14

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