Measurement of the running of the electromagnetic coupling at large momentum-transfer at LEP

Autores: Dova, María Teresa; L3 Collaboration
Año de publicación: 2005
Idioma: inglés
Tipo de recurso: artículo
Estado: versión publicada
Descripción: The evolution of the electromagnetic coupling, α, in the momentum-transfer range 1800 GeV² < −Q² < 21600 GeV² is studied with about 40 000 Bhabha-scattering events collected with the L3 detector at LEP at centre-of-mass energies √s = 189–209 GeV. The running of α is parametrised as: $α (Q^{2}) = \frac{α_{0}}{1 - C Δ α (Q^{2})},$ where α₀ ≡ α(Q² = 0) is the fine-structure constant and C = 1 corresponds to the evolution expected in QED. A fit to the differential cross section of the e⁺e⁻ → e⁺e⁻ process for scattering angles in the range |cos θ| < 0.9 excludes the hypothesis of a constant value of α, C = 0, and validates the QED prediction with the result: C = 1.05 ± 0.07 ± 0.14, where the first uncertainty is statistical and the second systematic.
Facultad de Ciencias Exactas
Materia: Ciencias Exactas
Física
Electromagnetismo
L3 detector
Nivel de accesibilidad: acceso abierto
Condiciones de uso: http://creativecommons.org/licenses/by/3.0/
Repositorio
Institución: Universidad Nacional de La Plata
OAI Identificador: oai:sedici.unlp.edu.ar:10915/79504

Acceder

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network_acronym_str	SEDICI
repository_id_str	1329
network_name_str	SEDICI (UNLP)
spelling	Measurement of the running of the electromagnetic coupling at large momentum-transfer at LEPDova, María TeresaL3 CollaborationCiencias ExactasFísicaElectromagnetismoL3 detectorThe evolution of the electromagnetic coupling, α, in the momentum-transfer range 1800 GeV<sup>2</sup> < −Q<sup>2</sup> < 21600 GeV<sup>2</sup> is studied with about 40 000 Bhabha-scattering events collected with the L3 detector at LEP at centre-of-mass energies √s = 189–209 GeV. The running of α is parametrised as: <math><mi is="true">α</mi><mrow is="true"><mo is="true">(</mo><msup is="true"><mi is="true">Q</mi><mn is="true">2</mn></msup><mo is="true">)</mo></mrow><mo is="true">=</mo><mfrac is="true"><msub is="true"><mi is="true">α</mi><mn is="true">0</mn></msub><mrow is="true"><mn is="true">1</mn><mo is="true">−</mo><mi is="true">C</mi><mi mathvariant="normal" is="true">Δ</mi><mi is="true">α</mi><mo stretchy="false" is="true">(</mo><msup is="true"><mi is="true">Q</mi><mn is="true">2</mn></msup><mo stretchy="false" is="true">)</mo></mrow></mfrac><mo is="true">,</mo></math> where α<sub>0</sub> ≡ α(Q<sup>2</sup> = 0) is the fine-structure constant and C = 1 corresponds to the evolution expected in QED. A fit to the differential cross section of the e<sup>+</sup>e<sup>−</sup> → e<sup>+</sup>e<sup>−</sup> process for scattering angles in the range \|cos θ\| < 0.9 excludes the hypothesis of a constant value of α, C = 0, and validates the QED prediction with the result: C = 1.05 ± 0.07 ± 0.14, where the first uncertainty is statistical and the second systematic.Facultad de Ciencias Exactas2005-08-02info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionArticulohttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdf26-36http://sedici.unlp.edu.ar/handle/10915/79504enginfo:eu-repo/semantics/altIdentifier/issn/0370-2693info:eu-repo/semantics/altIdentifier/doi/10.1016/j.physletb.2005.07.052info:eu-repo/semantics/openAccesshttp://creativecommons.org/licenses/by/3.0/Creative Commons Attribution 3.0 Unported (CC BY 3.0)reponame:SEDICI (UNLP)instname:Universidad Nacional de La Platainstacron:UNLP2025-09-29T11:12:17Zoai:sedici.unlp.edu.ar:10915/79504Institucionalhttp://sedici.unlp.edu.ar/Universidad públicaNo correspondehttp://sedici.unlp.edu.ar/oai/snrdalira@sedici.unlp.edu.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:13292025-09-29 11:12:17.977SEDICI (UNLP) - Universidad Nacional de La Platafalse
dc.title.none.fl_str_mv	Measurement of the running of the electromagnetic coupling at large momentum-transfer at LEP
title	Measurement of the running of the electromagnetic coupling at large momentum-transfer at LEP
spellingShingle	Measurement of the running of the electromagnetic coupling at large momentum-transfer at LEP Dova, María Teresa Ciencias Exactas Física Electromagnetismo L3 detector
title_short	Measurement of the running of the electromagnetic coupling at large momentum-transfer at LEP
title_full	Measurement of the running of the electromagnetic coupling at large momentum-transfer at LEP
title_fullStr	Measurement of the running of the electromagnetic coupling at large momentum-transfer at LEP
title_full_unstemmed	Measurement of the running of the electromagnetic coupling at large momentum-transfer at LEP
title_sort	Measurement of the running of the electromagnetic coupling at large momentum-transfer at LEP
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 Electromagnetismo L3 detector
topic	Ciencias Exactas Física Electromagnetismo L3 detector
dc.description.none.fl_txt_mv	The evolution of the electromagnetic coupling, α, in the momentum-transfer range 1800 GeV<sup>2</sup> < −Q<sup>2</sup> < 21600 GeV<sup>2</sup> is studied with about 40 000 Bhabha-scattering events collected with the L3 detector at LEP at centre-of-mass energies √s = 189–209 GeV. The running of α is parametrised as: <math><mi is="true">α</mi><mrow is="true"><mo is="true">(</mo><msup is="true"><mi is="true">Q</mi><mn is="true">2</mn></msup><mo is="true">)</mo></mrow><mo is="true">=</mo><mfrac is="true"><msub is="true"><mi is="true">α</mi><mn is="true">0</mn></msub><mrow is="true"><mn is="true">1</mn><mo is="true">−</mo><mi is="true">C</mi><mi mathvariant="normal" is="true">Δ</mi><mi is="true">α</mi><mo stretchy="false" is="true">(</mo><msup is="true"><mi is="true">Q</mi><mn is="true">2</mn></msup><mo stretchy="false" is="true">)</mo></mrow></mfrac><mo is="true">,</mo></math> where α<sub>0</sub> ≡ α(Q<sup>2</sup> = 0) is the fine-structure constant and C = 1 corresponds to the evolution expected in QED. A fit to the differential cross section of the e<sup>+</sup>e<sup>−</sup> → e<sup>+</sup>e<sup>−</sup> process for scattering angles in the range \|cos θ\| < 0.9 excludes the hypothesis of a constant value of α, C = 0, and validates the QED prediction with the result: C = 1.05 ± 0.07 ± 0.14, where the first uncertainty is statistical and the second systematic. Facultad de Ciencias Exactas
description	The evolution of the electromagnetic coupling, α, in the momentum-transfer range 1800 GeV<sup>2</sup> < −Q<sup>2</sup> < 21600 GeV<sup>2</sup> is studied with about 40 000 Bhabha-scattering events collected with the L3 detector at LEP at centre-of-mass energies √s = 189–209 GeV. The running of α is parametrised as: <math><mi is="true">α</mi><mrow is="true"><mo is="true">(</mo><msup is="true"><mi is="true">Q</mi><mn is="true">2</mn></msup><mo is="true">)</mo></mrow><mo is="true">=</mo><mfrac is="true"><msub is="true"><mi is="true">α</mi><mn is="true">0</mn></msub><mrow is="true"><mn is="true">1</mn><mo is="true">−</mo><mi is="true">C</mi><mi mathvariant="normal" is="true">Δ</mi><mi is="true">α</mi><mo stretchy="false" is="true">(</mo><msup is="true"><mi is="true">Q</mi><mn is="true">2</mn></msup><mo stretchy="false" is="true">)</mo></mrow></mfrac><mo is="true">,</mo></math> where α<sub>0</sub> ≡ α(Q<sup>2</sup> = 0) is the fine-structure constant and C = 1 corresponds to the evolution expected in QED. A fit to the differential cross section of the e<sup>+</sup>e<sup>−</sup> → e<sup>+</sup>e<sup>−</sup> process for scattering angles in the range \|cos θ\| < 0.9 excludes the hypothesis of a constant value of α, C = 0, and validates the QED prediction with the result: C = 1.05 ± 0.07 ± 0.14, where the first uncertainty is statistical and the second systematic.
publishDate	2005
dc.date.none.fl_str_mv	2005-08-02
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/10915/79504
url	http://sedici.unlp.edu.ar/handle/10915/79504
dc.language.none.fl_str_mv	eng
language	eng
dc.relation.none.fl_str_mv	info:eu-repo/semantics/altIdentifier/issn/0370-2693 info:eu-repo/semantics/altIdentifier/doi/10.1016/j.physletb.2005.07.052
dc.rights.none.fl_str_mv	info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/3.0/ Creative Commons Attribution 3.0 Unported (CC BY 3.0)
eu_rights_str_mv	openAccess
rights_invalid_str_mv	http://creativecommons.org/licenses/by/3.0/ Creative Commons Attribution 3.0 Unported (CC BY 3.0)
dc.format.none.fl_str_mv	application/pdf 26-36
dc.source.none.fl_str_mv	reponame:SEDICI (UNLP) instname:Universidad Nacional de La Plata instacron:UNLP
reponame_str	SEDICI (UNLP)
collection	SEDICI (UNLP)
instname_str	Universidad Nacional de La Plata
instacron_str	UNLP
institution	UNLP
repository.name.fl_str_mv	SEDICI (UNLP) - Universidad Nacional de La Plata
repository.mail.fl_str_mv	alira@sedici.unlp.edu.ar
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Measurement of the running of the electromagnetic coupling at large momentum-transfer at LEP

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