Study of W-boson polarisations and triple gauge boson couplings in the reaction e+e-→W+W- at LEP 2

被引：45

作者：

Abdallah, J. ^{[28
,29
]}

Abreu, P. ^{[25
]}

Adam, W. ^{[67
]}

Adzic, P. ^{[12
]}

Albrecht, T. ^{[20
]}

Alemany-Fernandez, R. ^{[9
]}

Allmendinger, T. ^{[20
]}

Allport, P. P. ^{[26
]}

Amaldi, U.

Amapane, N. ^{[56
,57
]}

Amato, S. ^{[63
]}

Anashkin, E. ^{[42
,43
]}

Andreazza, A. ^{[32
,33
]}

Andringa, S. ^{[25
]}

Anjos, N. ^{[25
]}

Antilogus, P. ^{[28
,29
]}

Apel, W. -D. ^{[20
]}

Arnoud, Y. ^{[16
]}

Ask, S. ^{[9
]}

Asman, B.

Augustin, J. E. ^{[28
,29
]}

Augustinus, A. ^{[9
]}

Baillon, P. ^{[9
]}

Ballestrero, A. ^{[58
,59
]}

Bambade, P. ^{[23
]}

Barbier, R. ^{[31
]}

Bardin, D. ^{[19
]}

Barker, G. J. ^{[69
]}

Baroncelli, A.

Battaglia, M. ^{[9
]}

Baubillier, M. ^{[28
,29
]}

Becks, K-H. ^{[70
]}

Begalli, M.

Behrmann, A. ^{[70
]}

Ben-Haim, E. ^{[23
]}

Benekos, N. ^{[38
]}

Benvenuti, A.

Berat, C. ^{[16
]}

Berggren, M. ^{[28
,29
]}

Bertrand, D.

Besancon, M. ^{[49
]}

Besson, N. ^{[49
]}

Bloch, D. ^{[10
]}

Blom, M. ^{[37
]}

Bluj, M. ^{[68
]}

Bonesini, M. ^{[34
,35
]}

Boonekamp, M. ^{[49
]}

Booth, P. S. L. ^{[26
]}

Borisov, G. ^{[24
]}

Botner, O. ^{[64
]}

机构：

[1] Univ Athens, Phys Lab, Athens 10680, Greece

[2] Univ Bergen, Dept Phys, N-5007 Bergen, Norway

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

[4] INFN, I-40126 Bologna, Italy

[5] Ctr Brasileiro Pesquisas Fis, BR-22290 Rio De Janeiro, Brazil

[6] Univ Estadual Rio Janeiro, Inst Fis, Rio De Janeiro, Brazil

[7] ULB VUB, IIHE, B-1050 Brussels, Belgium

[8] Coll France, Phys Corpusculaire Lab, CNRS, IN2P3, F-75231 Paris, France

[9] CERN, CH-1211 Geneva 23, Switzerland

[10] ULP BP20, CNRS, IN2P3, Inst Rech Subatom, F-67037 Strasbourg, France

[11] DESY, D-15735 Zeuthen, Germany

[12] Inst Phys Nucl, NCSR Demokritos, Athens 15310, Greece

[13] CAS, Div High Energy Phys, Inst Phys, FZU, Prague 18221, Czech Republic

[14] Univ Genoa, Dipartimento Fis, I-16146 Genoa, Italy

[15] Ist Nazl Fis Nucl, I-16146 Genoa, Italy

[16] Univ Grenoble 1, CNRS, Inst Sci Nucl, IN2P3, F-38026 Grenoble, France

[17] Univ Helsinki, Helsinki Inst Phys, FIN-00014 Helsinki, Finland

[18] Univ Helsinki, Dept Phys Sci, FIN-00014 Helsinki, Finland

[19] Joint Inst Nucl Res, Moscow 101000, Russia

[20] Univ Karlsruhe, Inst Expt Kernphys, D-76128 Karlsruhe, Germany

[21] Inst Nucl Phys PAN, PL-31142 Krakow, Poland

[22] Univ Min & Met Krakow, Fac Phys & Nucl Tech, PL-30055 Krakow, Poland

[23] Univ Paris 11, Lab Accelerateur Lineaire, CNRS, IN2P3, F-91405 Orsay, France

[24] Univ Lancaster, Sch Phys & Chem, Lancaster LA1 4YB, England

[25] LIP, IST, FCUL, P-1000 Lisbon, Portugal

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

[27] Univ Glasgow, Dept Phys & Astron, Glasgow G12 8QQ, Lanark, Scotland

[28] Univ Paris 06, CNRS, IN2P3, LPNHE, F-75252 Paris, France

[29] Univ Paris 08, CNRS, IN2P3, LPNHE, F-75252 Paris, France

[30] Lund Univ, Dept Phys, S-22363 Lund, Sweden

[31] Univ Lyon 1, CNRS, IN2P3, IPNL, F-69622 Villeurbanne, France

[32] Univ Milan, Dipartimento Fis, I-20133 Milan, Italy

[33] INFN MILANO, I-20133 Milan, Italy

[34] Univ Milano Bicocca, Dipartimento Fis, I-20126 Milan, Italy

[35] INFN MILANO, I-20126 Milan, Italy

[36] Charles Univ Prague, MFF, IPNP, Areal MFF, Prague 18000, Czech Republic

[37] NIKHEF H, NL-1009 DB Amsterdam, Netherlands

[38] Natl Tech Univ Athens, Dept Phys, GR-15773 Athens, Greece

[39] Univ Oslo, Dept Phys, N-0316 Oslo, Norway

[40] Univ Oviedo, Dpto Fis, Oviedo 33007, Spain

[41] Univ Oxford, Dept Phys, Oxford OX1 3RH, England

[42] Univ Padua, Dipartimento Fis, I-35131 Padua, Italy

[43] Ist Nazl Fis Nucl, I-35131 Padua, Italy

[44] Rutherford Appleton Lab, Didcot OX11 OQX, Oxon, England

[45] Univ Roma Tor Vergata, Dipartimento Fis, I-00173 Rome, Italy

[46] Ist Nazl Fis Nucl, I-00173 Rome, Italy

[47] Univ Roma 3, Dipartimento Fis, I-00146 Rome, Italy

[48] Ist Nazl Fis Nucl, I-00146 Rome, Italy

[49] CEA Saclay, Serv Phys Particules, DAPNIA, F-91191 Gif Sur Yvette, France

[50] CSIC UC, Inst Fis Cantabria, Santander 39006, Spain

来源：

EUROPEAN PHYSICAL JOURNAL C | 2008年 / 54卷 / 03期

关键词：

D O I：

10.1140/epjc/s10052-008-0528-3

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：

A determination of the single W spin density matrix (SDM) elements in the reaction e(+)e(-) -> W+W--> l nu q (q) over bar (l=e/mu) is reported at centre-of-mass energies between 189 and 209GeV. The data sample used corresponds to an integrated luminosity of 520pb(-1) taken by DELPHI between 1998 and 2000. The single W SDM elements, rho(W +/-)(tau tau') (tau,tau'=+/- 1 or 0), are determined as a function of the W- production angle with respect to the e(-) beam direction and are obtained from measurements of the W decay products by the application of suitable projection operators, Lambda(tau tau'), which assume the V-A coupling of the W-boson to fermions. The measured SDM elements are used to obtain the fraction of longitudinally polarised Ws, with the result: sigma(L)/sigma(tot) = 24.9 +/- 4.5 (stat) +/- 2.2 (syst)% at a mean energy of 198 GeV. The SDM elements are also used to determine the triple gauge couplings Delta g(1)(Z), Delta kappa(gamma), lambda(gamma) and g(4)(Z), (kappa) over tilde (Z) and (lambda) over tilde (Z). For the CP-violating couplings the results of single parameter fits are: g(4)(Z) = -0.39(-0.20)(+0.19) (kappa) over tilde (Z) = -0.09(-0.05)(+0.08) (lambda) over tilde (Z) = -0.08 +/- 0.07. The errors are a combination of statistical and systematic errors. All results are consistent with the Standard Model.

引用

页码：345 / 364

页数：20

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