The
OPAL
collaboration
Acton, P.D.
;
Alexander, G.
;
Allison, John
;
*et al. *

Z.Phys.C 58 (1993) 219-238, 1993.

https://inspirehep.net/literature/352696
Inspire Record
352696
DOI
10.17182/hepdata.14495
https://doi.org/10.17182/hepdata.14495
New measurements of the hadronic and leptonic cross sections and of the leptonic forward-backward asymmetries ine+e− collisions are presented. The analysis includes data recorded up to the end of 1991 by the OPAL experiment at LEP, with centre-of-mass energies within ±3 GeV of the Z0 mass. The results are based on a recorded total of 454 000 hadronic and 58 000 leptonic events. A model independent analysis of Z0 parameters based on an extension of the improved Born approximation is presented leading to test of lepton universality and an interpretation of the results within the Standard Model framework. The determination of the mass and width of the Z0 benefit from an improved understanding of the LEP energy calibration.

5
data tables
match query

Additional systematic error of 0.003.

Forward-backward asymmetry from counting number of events. Additional systematic error of 0.003.

2
data tables
match query

Asymmetries. Systematic error is 1 pct.

Asymmetries. Systematic error is 1 pct.

The
OPAL
collaboration
Akrawy, M.Z.
;
Alexander, G.
;
Allison, J.
;
*et al. *

Phys.Lett.B 247 (1990) 458-472, 1990.

https://inspirehep.net/literature/297139
Inspire Record
297139
DOI
10.17182/hepdata.29630
https://doi.org/10.17182/hepdata.29630
The couplings of the Z 0 to charged leptons are studied using measurements of the lepton pair cross sections and forward-backward asymmetries at centre of mass energies near to the mass of the Z 0 . The data are consistent with lepton universality. Using a parametrisation of the lepton pair differential cross section which assumes that the Z 0 has only vector and axial couplings to leptons, the charged leptonic partial decay width of the Z 0 is determined to be Г ol+ol− = 83.1±1.9 MeV and the square of the product of the effective axial vector and vector coupling constants of the Z 0 to charged leptons to be a ̌ 2 ol v ̌ 2 ol = 0.0039± 0.0083 , in agreement with the standard model. A parametrisation in the form of the improved Born approximation gives effective leptonic axial vector and vector coupling constants a ̌ 2 ol = 0.998±0.024 and v ̌ 2 ol = 0.0044±0.0083 . In the framework of the standard model, the values of the parameters ϱ z and sin 2 θ w are found to be 0.998±0.024 and 0.233 +0.045 −0.012 respectively. Using the relationship in the minimal standard model between ϱ z and sin 2 θ w , the results sin 2 θ SM w = 0.233 +0.007 −0.006 is obtained. Our previously published measurement of the ratio of the hadronic to the leptonic partial width of the Z 0 is update: R z = 21.72 +0.71 −0.65 .

3
data tables
match query

Forward-backward asymmetry corrected for kinematic cuts. Errors have systematics folded.

Forward-backward asymmetry. Statistical errors only.

Forward-backward asymmetry. Statistical errors only.

4
data tables
match query

No description provided.

No description provided.

No description provided.

The
DELPHI
collaboration
Abreu, P.
;
Adam, W.
;
Adye, T.
;
*et al. *

Nucl.Phys.B 418 (1994) 403-427, 1994.

https://inspirehep.net/literature/373114
Inspire Record
373114
DOI
10.17182/hepdata.48349
https://doi.org/10.17182/hepdata.48349
During the 1992 running period of the LEP e + e − collider, the DELPHI experiment accumulated approximately 24 pb − of data at the Z 0 peak. The decays into hadrons and charged leptons have been analysed to give values for the cross sections and leptonic forward-backward asymmetries which are significantly improved with respect to those previously published by the DELPHI collaboration. Incorporating these new data, more precise values for the Z 0 resonance parameters are obtained from model-independent fits. The results are interpreted within the framework of the Standard Model, yielding for the top quark mass m t = 157 −48 +36 (expt.) −20 +19 (Higgs) GeV, and for the effective mixing angle sin 2 θ eff lept = 0.2328 ± 0.0013 (expt.) −0.0003 +0.0001 (Higgs), where (Higgs) represents the variation due to Higgs boson mass in the range 60 to 1000 GeV, with central value 300 GeV.

4
data tables
match query

No description provided.

No description provided.

The
L3
collaboration
Adeva, B.
;
Adriani, O.
;
Aguilar-Benitez, M.
;
*et al. *

Phys.Lett.B 236 (1990) 109-115, 1990.

https://inspirehep.net/literature/283470
Inspire Record
283470
DOI
10.17182/hepdata.29715
https://doi.org/10.17182/hepdata.29715
We have measured both the rates and the forward-backward asymmetry of ℓ + ℓ − from Z 0 →ℓ + ℓ − (where ℓ= μ , τ ) with the L3 detector. We obtained Γ ℓℓ =88±4±3 MeV and the vector neutral current coupling constant, g v =0.00±0.07 and the axial vector neutral current coupling constant, g A =−0.515±0.015.

1
data table
match query

No description provided.

The
CELLO
collaboration
Behrend, H.J.
;
Criegee, L.
;
Field, J.H.
;
*et al. *

Z.Phys.C 51 (1991) 149-156, 1991.

https://inspirehep.net/literature/301727
Inspire Record
301727
DOI
10.17182/hepdata.14981
https://doi.org/10.17182/hepdata.14981
Differential cross section data of the CELLO experiment on pair production of muons, taus, and heavy quarks ine+e−-annihilation are presented and analysed, together with our data on Bhabha scattering, in terms of compositeness effects characterized by the mass scale Λ. We discuss difficulties in the combination of limits Λ from different experiments. The appropriate parameter to combine different results turns out to be ɛ=±1/Λ2, which is in contrast to Λ Gaussian distributed.

2
data tables
match query

Charge asymmetry for charm quarks derived from the differential cross section data.

Charge asymmetry for bottom quarks derived from the differential cross section data.

The
TASSO
collaboration
Braunschweig, W.
;
Gerhards, R.
;
Kirschfink, F.J.
;
*et al. *

Z.Phys.C 43 (1989) 549, 1989.

https://inspirehep.net/literature/277662
Inspire Record
277662
DOI
10.17182/hepdata.15454
https://doi.org/10.17182/hepdata.15454
We report on total cross section and forward backward charge asymmetry measurements of the reactione+e− → τ+τ− at centre of mass energies of 35.0 GeV and 42.4 GeV using the TASSO detector. Including previous data an analysis in terms of electroweak parameters of the standard model is presented, and lower limits on mass scale parameters of residual contact interactions are given. A combined analysis of electroweak couplings using all our results on leptonic reactionse+e−→l+l− has been performed.

1
data table
match query

No description provided.

The
CELLO
collaboration
Behrend, H.J.
;
Chen, C.
;
Fenner, H.
;
*et al. *

Z.Phys.C 16 (1983) 301, 1983.

https://inspirehep.net/literature/180756
Inspire Record
180756
DOI
10.17182/hepdata.16385
https://doi.org/10.17182/hepdata.16385
Differential cross sections fore+e−→e+e−, τ+, τ- measured with the CELLO detector at\(\left\langle {\sqrt s } \right\rangle= 34.2GeV\) have been analyzed for electroweak contributions. Vector and axial vector coupling constants were obtained in a simultaneous fit to the three differential cross sections assuming a universal weak interaction for the charged leptons. The results,v2=−0.12±0.33 anda2=1.22±0.47, are in good agreement with predictions from the standardSU(2)×U(1) model for\(\sin ^2 \theta _w= 0.228\). Combining this result with neutrino-electron scattering data gives a unique axial vector dominated solution for the leptonic weak couplings. Assuming the validity of the standard model, a value of\(\sin ^2 \theta _w= 0.21_{ - 0.09}^{ + 0.14}\) is obtained for the electroweak mixing angle. Additional vector currents are not observed (C<0.031 is obtained at the 95% C.L.).

1
data table
match query

The
DELPHI
collaboration
Abdallah, J.
;
Abreu, P.
;
Adam, W.
;
*et al. *

Eur.Phys.J.C 45 (2006) 589-632, 2006.

https://inspirehep.net/literature/699726
Inspire Record
699726
DOI
10.17182/hepdata.48590
https://doi.org/10.17182/hepdata.48590
This paper presents DELPHI measurements and interpretations of cross-sections, forward-backward asymmetries, and angular distributions, for the e+e- -> ffbar process for centre-of-mass energies above the Z resonance, from sqrt(s) ~ 130 - 207 GeV at the LEP collider. The measurements are consistent with the predictions of the Standard Model and are used to study a variety of models including the S-Matrix ansatz for e+e- -> ffbar scattering and several models which include physics beyond the Standard Model: the exchange of Z' bosons, contact interactions between fermions, the exchange of gravitons in large extra dimensions and the exchange of sneutrino in R-parity violating supersymmetry.

5
data tables
match query

Measured cross sections and forward-backward asymmetries for non-radiative E+ E- --> E+ E- events.

Measured cross sections and forward-backward asymmetries for inclusive E+ E- --> MU+ MU- events.

Measured cross sections and forward-backward asymmetries for non-radiative E+ E- --> MU+ MU- events.