Measurement of τ polarisation at LEP

Using the data collected with the L3 detector at LEP between 1990 and 1995, corresponding to an integrated luminosity of 149 pb−1, the τ longitudinal polarisation has been measured as a function of the production polar angle using the τ decays τ−→h−ντ (h=π,ρ,a1) and <math><mtext>τ</mt...

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Autores principales: Dova, María Teresa, L3 Collaboration
Formato: Articulo
Lenguaje:Inglés
Publicado: 2003
Materias:
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/77910
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id I19-R120-10915-77910
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Ciencias Exactas
Física
τ polarisation
L3 detector
spellingShingle Ciencias Exactas
Física
τ polarisation
L3 detector
Dova, María Teresa
L3 Collaboration
Measurement of τ polarisation at LEP
topic_facet Ciencias Exactas
Física
τ polarisation
L3 detector
description Using the data collected with the L3 detector at LEP between 1990 and 1995, corresponding to an integrated luminosity of 149 pb−1, the τ longitudinal polarisation has been measured as a function of the production polar angle using the τ decays τ−→h−ντ (h=π,ρ,a1) and <math><mtext>τ</mtext><msup><mi></mi><mn>−</mn></msup><mtext>→ℓ</mtext><msup><mi></mi><mn>−</mn></msup><mtext>ν</mtext><mtext>̄</mtext><msub><mi></mi><mn>ℓ</mn></msub><mtext>ν</mtext><msub><mi></mi><mn>τ</mn></msub></math> (ℓ=e,μ). From this measurement the quantities Ae and Aτ, which depend on the couplings of the electron and the τ to the Z, are determined to be Ae=0.1678±0.0127±0.0030 and Aτ=01540±0.0088±0.0062, consistent with the hypothesis of e–τ universality. Under this assumption a value of <math><mtext>A</mtext><msub><mi></mi><mn>ℓ</mn></msub><mtext>=0.1540±0.0074±0.0044</mtext></math> is obtained, yielding the value of the effective weak mixing angle <math><mtext>sin</mtext><msup><mi></mi><mn>2</mn></msup><mtext>θ</mtext><msub><mi></mi><mn><mtext>W</mtext></mn></msub><mtext>=0.2306±0.0011</mtext></math>.
format Articulo
Articulo
author Dova, María Teresa
L3 Collaboration
author_facet Dova, María Teresa
L3 Collaboration
author_sort Dova, María Teresa
title Measurement of τ polarisation at LEP
title_short Measurement of τ polarisation at LEP
title_full Measurement of τ polarisation at LEP
title_fullStr Measurement of τ polarisation at LEP
title_full_unstemmed Measurement of τ polarisation at LEP
title_sort measurement of τ polarisation at lep
publishDate 2003
url http://sedici.unlp.edu.ar/handle/10915/77910
work_keys_str_mv AT dovamariateresa measurementoftpolarisationatlep
AT l3collaboration measurementoftpolarisationatlep
bdutipo_str Repositorios
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