Measurement of cross sections and leptonic forward-backward asymmetries at the Z pole and determination of electroweak parameters
- Autores
- Dova, María Teresa; L3 Collaboration
- Año de publicación
- 1994
- Idioma
- inglés
- Tipo de recurso
- artículo
- Estado
- versión publicada
- Descripción
- We report on the measurement of the leptonic and hadronic cross sections and leptonic forward-backward asymmetries at theZ peak with the L3 detector at LEP. The total luminosity of 40.8 pb−1 collected in the years 1990, 1991 and 1992 corresponds to 1.09·106 hadronic and 0.98·105 leptonic Z decays observed. These data allow us to determine the electroweak parameters. From the cross sections we derive the properties of the Z boson: MZ=91195 ± 9 MeVΓZ=2494 ± 10 MeV Γhad=1748 ± 10 MeVΓℓ=83.49 ± 0.46MeV assuming lepton universality. We obtain an invisible width of Γinv=496.5 ± 7.9 MeV which, in the Standard Model, corresponds to a number of light neutrino species of Nv=2.981 ± 0.050. Using also the three leptonic forward-backward asymmetries and the average tau polarization, we determine the effective vector and axial-vector coupling constants of the neutral weak current to charged leptons to be: g¯ℓv=−0.0378+0.0045−0.0042 g¯ℓA=−0.4998 ± 0.0014. Within the framework of the Standard Model, and including our measurements of the Z→b¯b forward-backward asymmetry and partial decay width, we derive an effective electroweak mixing angle of sin2¯θW=0.2326 ± 0.0012 . We obtain an estimate for the strong coupling constant, αS=0.142 ± 0.013 and for the top-quark mass,mt =158+32−40 ± 19(Higgs) GeV, where the second error arises due to the uncertainty in the Higgs-boson mass.
Facultad de Ciencias Exactas - Materia
-
Ciencias Exactas
Física
Partículas Elementales
L3 detector
la̵rge hadron collider - Nivel de accesibilidad
- acceso abierto
- Condiciones de uso
- http://creativecommons.org/licenses/by-nc-sa/4.0/
- Repositorio
- Institución
- Universidad Nacional de La Plata
- OAI Identificador
- oai:sedici.unlp.edu.ar:10915/81046
Ver los metadatos del registro completo
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Measurement of cross sections and leptonic forward-backward asymmetries at the Z pole and determination of electroweak parametersDova, María TeresaL3 CollaborationCiencias ExactasFísicaPartículas ElementalesL3 detectorla̵rge hadron colliderWe report on the measurement of the leptonic and hadronic cross sections and leptonic forward-backward asymmetries at theZ peak with the L3 detector at LEP. The total luminosity of 40.8 pb<sup>−1</sup> collected in the years 1990, 1991 and 1992 corresponds to 1.09·10<sup>6</sup> hadronic and 0.98·10<sup>5</sup> leptonic Z decays observed. These data allow us to determine the electroweak parameters. From the cross sections we derive the properties of the Z boson: M<sub>Z</sub>=91195 ± 9 MeVΓ<sub>Z</sub>=2494 ± 10 MeV Γ<sub>had</sub>=1748 ± 10 MeVΓ<sub>ℓ</sub>=83.49 ± 0.46MeV assuming lepton universality. We obtain an invisible width of Γ<sub>inv</sub>=496.5 ± 7.9 MeV which, in the Standard Model, corresponds to a number of light neutrino species of Nv=2.981 ± 0.050. Using also the three leptonic forward-backward asymmetries and the average tau polarization, we determine the effective vector and axial-vector coupling constants of the neutral weak current to charged leptons to be: g¯ℓv=−0.0378<sup>+0.0045</sup><sub>−0.0042</sub> g¯ℓA=−0.4998 ± 0.0014. Within the framework of the Standard Model, and including our measurements of the Z→b¯b forward-backward asymmetry and partial decay width, we derive an effective electroweak mixing angle of sin<sup>2</sup>¯θ<sub>W</sub>=0.2326 ± 0.0012 . We obtain an estimate for the strong coupling constant, α<sub>S</sub>=0.142 ± 0.013 and for the top-quark mass,m<sub>t</sub> =158<sup>+32</sup><sub>−40</sub> ± 19(Higgs) GeV, where the second error arises due to the uncertainty in the Higgs-boson mass.Facultad de Ciencias Exactas1994-12info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionArticulohttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdf551-573http://sedici.unlp.edu.ar/handle/10915/81046enginfo:eu-repo/semantics/altIdentifier/issn/0170-9739info:eu-repo/semantics/altIdentifier/doi/10.1007/BF01574160info:eu-repo/semantics/openAccesshttp://creativecommons.org/licenses/by-nc-sa/4.0/Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)reponame:SEDICI (UNLP)instname:Universidad Nacional de La Platainstacron:UNLP2025-09-29T11:15:01Zoai:sedici.unlp.edu.ar:10915/81046Institucionalhttp://sedici.unlp.edu.ar/Universidad públicaNo correspondehttp://sedici.unlp.edu.ar/oai/snrdalira@sedici.unlp.edu.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:13292025-09-29 11:15:01.84SEDICI (UNLP) - Universidad Nacional de La Platafalse |
dc.title.none.fl_str_mv |
Measurement of cross sections and leptonic forward-backward asymmetries at the Z pole and determination of electroweak parameters |
title |
Measurement of cross sections and leptonic forward-backward asymmetries at the Z pole and determination of electroweak parameters |
spellingShingle |
Measurement of cross sections and leptonic forward-backward asymmetries at the Z pole and determination of electroweak parameters Dova, María Teresa Ciencias Exactas Física Partículas Elementales L3 detector la̵rge hadron collider |
title_short |
Measurement of cross sections and leptonic forward-backward asymmetries at the Z pole and determination of electroweak parameters |
title_full |
Measurement of cross sections and leptonic forward-backward asymmetries at the Z pole and determination of electroweak parameters |
title_fullStr |
Measurement of cross sections and leptonic forward-backward asymmetries at the Z pole and determination of electroweak parameters |
title_full_unstemmed |
Measurement of cross sections and leptonic forward-backward asymmetries at the Z pole and determination of electroweak parameters |
title_sort |
Measurement of cross sections and leptonic forward-backward asymmetries at the Z pole and determination of electroweak parameters |
dc.creator.none.fl_str_mv |
Dova, María Teresa L3 Collaboration |
author |
Dova, María Teresa |
author_facet |
Dova, María Teresa L3 Collaboration |
author_role |
author |
author2 |
L3 Collaboration |
author2_role |
author |
dc.subject.none.fl_str_mv |
Ciencias Exactas Física Partículas Elementales L3 detector la̵rge hadron collider |
topic |
Ciencias Exactas Física Partículas Elementales L3 detector la̵rge hadron collider |
dc.description.none.fl_txt_mv |
We report on the measurement of the leptonic and hadronic cross sections and leptonic forward-backward asymmetries at theZ peak with the L3 detector at LEP. The total luminosity of 40.8 pb<sup>−1</sup> collected in the years 1990, 1991 and 1992 corresponds to 1.09·10<sup>6</sup> hadronic and 0.98·10<sup>5</sup> leptonic Z decays observed. These data allow us to determine the electroweak parameters. From the cross sections we derive the properties of the Z boson: M<sub>Z</sub>=91195 ± 9 MeVΓ<sub>Z</sub>=2494 ± 10 MeV Γ<sub>had</sub>=1748 ± 10 MeVΓ<sub>ℓ</sub>=83.49 ± 0.46MeV assuming lepton universality. We obtain an invisible width of Γ<sub>inv</sub>=496.5 ± 7.9 MeV which, in the Standard Model, corresponds to a number of light neutrino species of Nv=2.981 ± 0.050. Using also the three leptonic forward-backward asymmetries and the average tau polarization, we determine the effective vector and axial-vector coupling constants of the neutral weak current to charged leptons to be: g¯ℓv=−0.0378<sup>+0.0045</sup><sub>−0.0042</sub> g¯ℓA=−0.4998 ± 0.0014. Within the framework of the Standard Model, and including our measurements of the Z→b¯b forward-backward asymmetry and partial decay width, we derive an effective electroweak mixing angle of sin<sup>2</sup>¯θ<sub>W</sub>=0.2326 ± 0.0012 . We obtain an estimate for the strong coupling constant, α<sub>S</sub>=0.142 ± 0.013 and for the top-quark mass,m<sub>t</sub> =158<sup>+32</sup><sub>−40</sub> ± 19(Higgs) GeV, where the second error arises due to the uncertainty in the Higgs-boson mass. Facultad de Ciencias Exactas |
description |
We report on the measurement of the leptonic and hadronic cross sections and leptonic forward-backward asymmetries at theZ peak with the L3 detector at LEP. The total luminosity of 40.8 pb<sup>−1</sup> collected in the years 1990, 1991 and 1992 corresponds to 1.09·10<sup>6</sup> hadronic and 0.98·10<sup>5</sup> leptonic Z decays observed. These data allow us to determine the electroweak parameters. From the cross sections we derive the properties of the Z boson: M<sub>Z</sub>=91195 ± 9 MeVΓ<sub>Z</sub>=2494 ± 10 MeV Γ<sub>had</sub>=1748 ± 10 MeVΓ<sub>ℓ</sub>=83.49 ± 0.46MeV assuming lepton universality. We obtain an invisible width of Γ<sub>inv</sub>=496.5 ± 7.9 MeV which, in the Standard Model, corresponds to a number of light neutrino species of Nv=2.981 ± 0.050. Using also the three leptonic forward-backward asymmetries and the average tau polarization, we determine the effective vector and axial-vector coupling constants of the neutral weak current to charged leptons to be: g¯ℓv=−0.0378<sup>+0.0045</sup><sub>−0.0042</sub> g¯ℓA=−0.4998 ± 0.0014. Within the framework of the Standard Model, and including our measurements of the Z→b¯b forward-backward asymmetry and partial decay width, we derive an effective electroweak mixing angle of sin<sup>2</sup>¯θ<sub>W</sub>=0.2326 ± 0.0012 . We obtain an estimate for the strong coupling constant, α<sub>S</sub>=0.142 ± 0.013 and for the top-quark mass,m<sub>t</sub> =158<sup>+32</sup><sub>−40</sub> ± 19(Higgs) GeV, where the second error arises due to the uncertainty in the Higgs-boson mass. |
publishDate |
1994 |
dc.date.none.fl_str_mv |
1994-12 |
dc.type.none.fl_str_mv |
info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Articulo http://purl.org/coar/resource_type/c_6501 info:ar-repo/semantics/articulo |
format |
article |
status_str |
publishedVersion |
dc.identifier.none.fl_str_mv |
http://sedici.unlp.edu.ar/handle/10915/81046 |
url |
http://sedici.unlp.edu.ar/handle/10915/81046 |
dc.language.none.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
info:eu-repo/semantics/altIdentifier/issn/0170-9739 info:eu-repo/semantics/altIdentifier/doi/10.1007/BF01574160 |
dc.rights.none.fl_str_mv |
info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by-nc-sa/4.0/ Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0) |
eu_rights_str_mv |
openAccess |
rights_invalid_str_mv |
http://creativecommons.org/licenses/by-nc-sa/4.0/ Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0) |
dc.format.none.fl_str_mv |
application/pdf 551-573 |
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SEDICI (UNLP) - Universidad Nacional de La Plata |
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