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...
Guardado en:
Autores principales: | , |
---|---|
Formato: | Articulo |
Lenguaje: | Inglés |
Publicado: |
2003
|
Materias: | |
Acceso en línea: | http://sedici.unlp.edu.ar/handle/10915/77910 |
Aporte de: |
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 |
_version_ |
1764820485195956225 |