Trilinear couplings among the electroweak vector bosons and their determination at LEP2

Bilenky, M. S.; Kneur, J.L.; Renard, F. M.; Schildknecht, Dieter

doi:10.1016/0550-3213(93)90445-u

Cited by 133 publications

(193 citation statements)

References 17 publications

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“…For hadronic decays of the W boson where the quark cannot be distinguished from the antiquark, only the folded angular distributions of cos θ * and φ * are directly available. These folded distributions can be identified only with the symmetric 12 part of the angular distributions [3], whereas no information about the antisymmetric part is accessible. The following symmetric (combinations of) spin density matrix elements can be extracted from the folded angular distribution by using the symmetric part of the projection operators only:…”

Section: The Spin Density Matrix (Sdm) Analysismentioning

confidence: 99%

“…The differential cross-section dσ/dΩ is determined using the program of Bilenky et al [3]. For events with two solutions for the five angles, the average of the differential cross-sections at the two solutions is used.…”

Section: Tgc Analysismentioning

confidence: 99%

“…3 The axes of the right-handed coordinate system in the W rest-frame are defined such that z is along the parent W flight direction and y is in the direction − → e − × − → W where − → e − is the electron beam direction and − → W is the parent W flight direction. 4 Throughout this paper charge conjugate modes are also included and qq implicitly means any pair of quark-antiquark of different (or same) flavour which can be produced in W (Z 0 ) decay.…”

Section: Data and Monte Carlo Modelsmentioning

confidence: 99%

“…In the Standard Model g z 1 =κ z =κ γ =1 and λ z =λ γ =0. Considerations related to SU(2)×U(1) gauge invariance, supported by constraints arising from precise measurements on the Z 0 resonance and lower energy data, suggest the following relations between the five couplings [1,3], ∆κ z = −∆κ γ tan 2 θ w + ∆g z 1 ,…”

Section: Introductionmentioning

confidence: 99%

“…The most general Lorentz invariant Lagrangian [1][2][3][4] which describes the triple gauge boson interaction involving W bosons has fourteen independent terms, seven describing the WWγ vertex and seven describing the WWZ vertex. This parameter space is very large, and it is not currently possible to measure all fourteen couplings independently.…”

Section: Introductionmentioning

confidence: 99%

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$\mathrm{W^+W^-}$ production and triple gauge boson couplings at LEP energies up to 183 GeV

et al. 1999

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A study of W-pair production in e + e − annihilations at LEP is presented, based on 877 W + W − candidates corresponding to an integrated luminosity of 57 pb −1 at √ s=183 GeV. Assuming that the angular distributions of the W-pair production and decay, as well as their branching fractions, are described by the Standard Model, the W-pair production cross-section is measured to be 15.43±0.61(stat.)±0.26(syst.) pb. Assuming lepton universality and combining with our results from lower centre-of-mass energies, the W branching fraction to hadrons is determined to be 67.9±1.2(stat.)±0.5(syst.)%. The number of W-pair candidates and the angular distributions for each final state (qqℓν ℓ , qqqq, ℓν ℓ ℓ ′ ν ℓ ′ ) are used to determine the triple gauge boson couplings. After combining these values with our results from lower centre-of-mass energies we obtain ∆κ γ =0.11 +0.52 −0.37 , ∆g z 1 =0.01 +0.13 −0.12 and λ=−0.10 +0.13 −0.12 , where the errors include both statistical and systematic uncertainties and each coupling is determined setting the other two couplings to the Standard Model value. The fraction of W bosons produced with a longitudinal polarisation is measured to be 0.242±0.091(stat.)±0.023(syst.). All these measurements are consistent with the Standard Model expectations.

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Section: The Spin Density Matrix (Sdm) Analysismentioning

confidence: 99%

Section: Tgc Analysismentioning

confidence: 99%

Section: Data and Monte Carlo Modelsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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$\mathrm{W^+W^-}$ production and triple gauge boson couplings at LEP energies up to 183 GeV

et al. 1999

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References

2013

Elementary Particle Physics

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Gauge Boson Production at LEP

Straessner

2010

Springer Tracts in Modern Physics

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The main research goals of the LEP program were the detailed study of the Z and W boson properties. In the first phase of LEP, the Z line-shape was explored to exactly determine the Z mass, width and the Z-fermion couplings. The data collected by the four LEP experiments at energies around the Z peak consists of 17 million Z decays, $$\textrm{e}^+\textrm{e}^-\to Z\to \textrm{f}\bar{\textrm{f}}(\gamma)$$, completed by 600 thousand Z decays measured by the SLD experiment at the SLC. A short summary of the main results shall be given here.

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Trilinear couplings among the electroweak vector bosons and their determination at LEP2

Cited by 133 publications

References 17 publications

$\mathrm{W^+W^-}$ production and triple gauge boson couplings at LEP energies up to 183 GeV

$\mathrm{W^+W^-}$ production and triple gauge boson couplings at LEP energies up to 183 GeV

References

Gauge Boson Production at LEP

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