Weak Corrections to Three-Jet Production in Electron-Positron Annihilations

We report on the calculation of the factorisable one-loop weak-interaction corrections to the initial and final states for three-jet observables in electron-positron annihilations. We show that whereas such corrections are negligibly small at LEP energies they are significantly enhanced at a future...

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Detalles Bibliográficos
Autores principales: Maina, E., Moretti, S., Ross, D.A.
Lenguaje:eng
Publicado: 2002
Materias:
Particle Physics - Phenomenology
Acceso en línea:https://dx.doi.org/10.1088/1126-6708/2003/04/056
http://cds.cern.ch/record/584002
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author Maina, E.
Moretti, S.
Ross, D.A.
author_facet Maina, E.
Moretti, S.
Ross, D.A.
author_sort Maina, E.
collection CERN
description We report on the calculation of the factorisable one-loop weak-interaction corrections to the initial and final states for three-jet observables in electron-positron annihilations. We show that whereas such corrections are negligibly small at LEP energies they are significantly enhanced at a future Linear Collider, where we argue that they may be similar in size to the two-loop QCD effects. The calculation has been performed using helicity amplitudes so that it can be applied to the case of polarised beams. The effects of beam polarisation can be extracted from an analysis of the angular distributions of the jets relative to the incident electron/positron directions
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institution Organización Europea para la Investigación Nuclear
language eng
publishDate 2002
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spelling cern-5840022023-03-14T18:42:27Zdoi:10.1088/1126-6708/2003/04/056http://cds.cern.ch/record/584002engMaina, E.Moretti, S.Ross, D.A.Weak Corrections to Three-Jet Production in Electron-Positron AnnihilationsParticle Physics - PhenomenologyWe report on the calculation of the factorisable one-loop weak-interaction corrections to the initial and final states for three-jet observables in electron-positron annihilations. We show that whereas such corrections are negligibly small at LEP energies they are significantly enhanced at a future Linear Collider, where we argue that they may be similar in size to the two-loop QCD effects. The calculation has been performed using helicity amplitudes so that it can be applied to the case of polarised beams. The effects of beam polarisation can be extracted from an analysis of the angular distributions of the jets relative to the incident electron/positron directionsWe report on the calculation of the factorisable one-loop weak-interaction corrections to the initial and final states for three-jet observables in electron-positron annihilations. We show that such corrections are of a few percent at $\sqrt s=M_Z$. Hence, while their impact is not dramatic in the context of LEP1 and SLC, where the total error on the measured value of $\alpha_{\mathrm{S}}$ is larger, at a future Linear Collider, running at the $Z$ mass peak (e.g., GigaZ), they ought to be taken into account in the experimental fits, as here the uncertainty on the value of the strong coupling constant is expected to be at the 0.1% level or even smaller. The calculation has been performed using helicity amplitudes so that it can be applied to the case of polarised beams.hep-ph/0210015DFTT-27-02CERN-TH-2002-191IPPP-02-48DCPT-02-96SHEP-02-24CERN-TH-2002-191DCPT-2002-96DFTT-2002-27IPPP-2002-48SHEP-2002-24oai:cds.cern.ch:5840022002-10-01
spellingShingle Particle Physics - Phenomenology
Maina, E.
Moretti, S.
Ross, D.A.
Weak Corrections to Three-Jet Production in Electron-Positron Annihilations
title Weak Corrections to Three-Jet Production in Electron-Positron Annihilations
title_full Weak Corrections to Three-Jet Production in Electron-Positron Annihilations
title_fullStr Weak Corrections to Three-Jet Production in Electron-Positron Annihilations
title_full_unstemmed Weak Corrections to Three-Jet Production in Electron-Positron Annihilations
title_short Weak Corrections to Three-Jet Production in Electron-Positron Annihilations
title_sort weak corrections to three-jet production in electron-positron annihilations
topic Particle Physics - Phenomenology
url https://dx.doi.org/10.1088/1126-6708/2003/04/056
http://cds.cern.ch/record/584002
work_keys_str_mv AT mainae weakcorrectionstothreejetproductioninelectronpositronannihilations
AT morettis weakcorrectionstothreejetproductioninelectronpositronannihilations
AT rossda weakcorrectionstothreejetproductioninelectronpositronannihilations

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