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Study of W-boson polarisations and triple gauge boson couplings in the reaction e(+)e(-)-> W+W- at LEP 2
Collaboration, D
2008
发表期刊EUROPEAN PHYSICAL JOURNAL C
卷号54期号:3页码:345-364
通讯作者Abdallah, J (reprint author), Iowa State Univ, Dept Phys & Astron, Ames, IA 50011 USA.
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.
关键词ELECTROWEAK VECTOR BOSONS CARLO EVENT GENERATOR E(+)E(-) COLLISIONS TRILINEAR COUPLINGS PAIR PRODUCTION PHYSICS COLLIDERS E+E-->W+W DELPHI ENERGY
学科领域Physics
DOI10.1140/epjc/s10052-008-0528-3
收录类别SCI
语种英语
WOS类目Physics, Particles & Fields
WOS记录号WOS:000254206800001
引用统计
被引频次:32[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ihep.ac.cn/handle/311005/212844
专题实验物理中心
作者单位中国科学院高能物理研究所
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Collaboration, D. Study of W-boson polarisations and triple gauge boson couplings in the reaction e(+)e(-)-> W+W- at LEP 2[J]. EUROPEAN PHYSICAL JOURNAL C,2008,54(3):345-364.
APA Collaboration, D.(2008).Study of W-boson polarisations and triple gauge boson couplings in the reaction e(+)e(-)-> W+W- at LEP 2.EUROPEAN PHYSICAL JOURNAL C,54(3),345-364.
MLA Collaboration, D."Study of W-boson polarisations and triple gauge boson couplings in the reaction e(+)e(-)-> W+W- at LEP 2".EUROPEAN PHYSICAL JOURNAL C 54.3(2008):345-364.
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