Bounds on the masses and couplings of leptoquarks from leptonic partial widths of the Z

The vertex corrections to the leptonic partial widths of the Z induced by leptoquarks that couple leptons to the top quark are considered. We obtain stringent bounds on the parameter space of the masses and Yukawa couplings of these leptoquarks, using the latest information on the Z \rightarrow l^+l...

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Detalles Bibliográficos
Autores principales: Bhattacharya, G, Ellis, Jonathan Richard, Sridhar, K
Lenguaje:eng
Publicado: 1994
Materias:
Particle Physics - Phenomenology
Acceso en línea:https://dx.doi.org/10.1016/0370-2693(94)00927-9
http://cds.cern.ch/record/265076
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author Bhattacharya, G
Ellis, Jonathan Richard
Sridhar, K
author_facet Bhattacharya, G
Ellis, Jonathan Richard
Sridhar, K
author_sort Bhattacharya, G
collection CERN
description The vertex corrections to the leptonic partial widths of the Z induced by leptoquarks that couple leptons to the top quark are considered. We obtain stringent bounds on the parameter space of the masses and Yukawa couplings of these leptoquarks, using the latest information on the Z \rightarrow l^+l^- decay widths measured at LEP. Leptoquarks coupling with electroweak strength to top quarks are constrained to be heavier than several hundred GeV, at 95\% C.L. As a consequence, such leptoquarks cannot make a significant contribution to lepton asymmetries, \tau polarisation asymmetries or A_{LR}.
id cern-265076
institution Organización Europea para la Investigación Nuclear
language eng
publishDate 1994
record_format invenio
spelling cern-2650762019-09-30T06:29:59Zdoi:10.1016/0370-2693(94)00927-9http://cds.cern.ch/record/265076engBhattacharya, GEllis, Jonathan RichardSridhar, KBounds on the masses and couplings of leptoquarks from leptonic partial widths of the ZParticle Physics - PhenomenologyThe vertex corrections to the leptonic partial widths of the Z induced by leptoquarks that couple leptons to the top quark are considered. We obtain stringent bounds on the parameter space of the masses and Yukawa couplings of these leptoquarks, using the latest information on the Z \rightarrow l^+l^- decay widths measured at LEP. Leptoquarks coupling with electroweak strength to top quarks are constrained to be heavier than several hundred GeV, at 95\% C.L. As a consequence, such leptoquarks cannot make a significant contribution to lepton asymmetries, \tau polarisation asymmetries or A_{LR}.hep-ph/9406354CERN-TH-7280-94oai:cds.cern.ch:2650761994
spellingShingle Particle Physics - Phenomenology
Bhattacharya, G
Ellis, Jonathan Richard
Sridhar, K
Bounds on the masses and couplings of leptoquarks from leptonic partial widths of the Z
title Bounds on the masses and couplings of leptoquarks from leptonic partial widths of the Z
title_full Bounds on the masses and couplings of leptoquarks from leptonic partial widths of the Z
title_fullStr Bounds on the masses and couplings of leptoquarks from leptonic partial widths of the Z
title_full_unstemmed Bounds on the masses and couplings of leptoquarks from leptonic partial widths of the Z
title_short Bounds on the masses and couplings of leptoquarks from leptonic partial widths of the Z
title_sort bounds on the masses and couplings of leptoquarks from leptonic partial widths of the z
topic Particle Physics - Phenomenology
url https://dx.doi.org/10.1016/0370-2693(94)00927-9
http://cds.cern.ch/record/265076
work_keys_str_mv AT bhattacharyag boundsonthemassesandcouplingsofleptoquarksfromleptonicpartialwidthsofthez
AT ellisjonathanrichard boundsonthemassesandcouplingsofleptoquarksfromleptonicpartialwidthsofthez
AT sridhark boundsonthemassesandcouplingsofleptoquarksfromleptonicpartialwidthsofthez

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