A study of W+W-γ events at LEP

被引：25

作者：

Abbiendi, G ^{[1
]}

Ainsley, C

Akesson, 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

Boeriu, O

Bock, P

Boutemeur, M

Braibant, S

Brigliadori, L

Brown, RM

Buesser, K

Burckhart, HJ

Campana, S

Carnegie, RK

Caron, B

Carter, AA

Carter, JR

Chang, CY

Charlton, DG

Csilling, A

Cuffiani, M

Dado, S

De Roeck, A

De Wolf, EA

Desch, K

Dienes, B

Donkers, M

Dubbert, J

Duchovni, E

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, Dept Phys, Ottawa Carleton Inst 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] Heidelberg Univ, Inst Phys, D-69120 Heidelberg, Germany

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

[13] Indiana Univ, Inst 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] 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, CLRC, 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, Dept Phys, Tokyo 1130033, Japan

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

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

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

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

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

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

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

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

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

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

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

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

[38] Univ Debrecen, Dept Expt Phys, Debrecen, Hungary

[39] MPI Extraterr Phys, Munich, Germany

[40] Res Inst Particle & Nucl Phys, Budapest, Hungary

[41] Univ Liverpool, Dept Phys, Liverpool L69 3BX, Merseyside, England

[42] CERN, Div EP, CH-1211 Geneva 23, Switzerland

[43] Univ Manchester, Manchester, Lancs, England

[44] KEK, High Energy Accelerator Res Org, Tsukuba, Ibaraki, Japan

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

来源：

PHYSICS LETTERS B | 2004年 / 580卷 / 1-2期

关键词：

D O I：

10.1016/j.physletb.2003.10.063

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

A study of W+W- events accompanied by hard photon radiation, Egamma > 2.5 GeV, produced in e(+)e(-) collisions at LEP is presented. Events consistent with being two on-shell W-bosons and an isolated photon are selected from 681 pb(-1) of data recorded at 180 GeV < roots < 209 GeV. From the sample of 187 selected W(+)W(-)gamma candidates with photon energies greater than 2.5 GeV, the W(+)W(-)gamma cross-section is determined at five values of roots. The results are consistent with the Standard Model expectation. Averaging over all energies, the ratio of the observed cross-section to the Standard Model expectation is R(data/SM) = 0.99 +/- 0.09 +/- 0.04, where the errors represent the statistical and systematic uncertainties respectively. These data provide constraints on the related O(alpha) systematic uncertainties on the measurement of the W-boson mass at LEP. Finally, the data are used to derive 95% confidence level upper limits on possible anomalous contributions to the W(+)W(-)gammagamma and W(+)W(-)Z(0)y vertices: -0.020 GeV-2 < a(0)/Lambda(2) < 0.020 GeV-2, -0.053 GeV-2 < a(c)/Lambda(2) < 0.037 GeV-2, -0.16 GeV-2 < a(n)/Lambda(2) < 0.15 GeV-2, where Lambda represents the energy scale for new physics and a(0), a(c) and a(n) are dimensionless coupling constants. (C) 2003 Elsevier B.V. All rights reserved.

引用

页码：17 / 36

页数：20

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