A precise measurement of the tau polarisation at LEP-1
The τ polarisation has been studied with the e+e- → τ+τ- data collected by the DELPHI detector at LEP in 1993, 1994 and 1995 around the Z resonance firstly through the exclusive decay channels evv̄, μvvμ, πv, ρv, and a1v and secondly with an inclusive hadronic analysis which benefits from a higher e...
প্রধান লেখক: | , , , , , , , , , , , , , , , , , , , , , , , , |
---|---|
বিন্যাস: | Journal article |
ভাষা: | English |
প্রকাশিত: |
2000
|
_version_ | 1826260765543235584 |
---|---|
author | Abreu, P Adam, W Adye, T Adzic, P Ajinenko, I Albrecht, Z Alderweireld, T Alekseev, G Alemany, R Allmendinger, T Allport, P Almehed, S Amaldi, U Amapane, N Amato, S Anassontzis, E Andersson, P Andreazza, A Andringa, S Antilogus, P Apel, W Arnoud, Y Asman, B Augustin, J Augustinus, A |
author_facet | Abreu, P Adam, W Adye, T Adzic, P Ajinenko, I Albrecht, Z Alderweireld, T Alekseev, G Alemany, R Allmendinger, T Allport, P Almehed, S Amaldi, U Amapane, N Amato, S Anassontzis, E Andersson, P Andreazza, A Andringa, S Antilogus, P Apel, W Arnoud, Y Asman, B Augustin, J Augustinus, A |
author_sort | Abreu, P |
collection | OXFORD |
description | The τ polarisation has been studied with the e+e- → τ+τ- data collected by the DELPHI detector at LEP in 1993, 1994 and 1995 around the Z resonance firstly through the exclusive decay channels evv̄, μvvμ, πv, ρv, and a1v and secondly with an inclusive hadronic analysis which benefits from a higher efficiency and a better systematic precision. The results have been combined with those previously published on 1990 to 1992 DELPHI data, to produce results which reflect the full LEP-1 statistics. The fit of the τ polarisation dependence on the production angle yielded the polarisation parameters Aτ = 0.1359 ± 0.0096 and Ae = 0.1382 ± 0.0116. From these results the ratio of the vector and axial-vector effective couplings v̄τ/āτ = 0.0683 ± 0.0048 and v̄e/āe = 0.0694 ± 0.0058 have been derived, compatible with e-τ universality. With the assumption of lepton universality, the ratio of vector to axial-vector effective couplings for leptons v̄ι/āι = 0.0687 ± 0.0037 was obtained, implying a value of the effective weak mixing angle sin2 θlepteff= 0.23282 ± 0.00092. |
first_indexed | 2024-03-06T19:10:53Z |
format | Journal article |
id | oxford-uuid:16bb84aa-9b6c-41df-a096-40ec2db449a1 |
institution | University of Oxford |
language | English |
last_indexed | 2024-03-06T19:10:53Z |
publishDate | 2000 |
record_format | dspace |
spelling | oxford-uuid:16bb84aa-9b6c-41df-a096-40ec2db449a12022-03-26T10:33:05ZA precise measurement of the tau polarisation at LEP-1Journal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:16bb84aa-9b6c-41df-a096-40ec2db449a1EnglishSymplectic Elements at Oxford2000Abreu, PAdam, WAdye, TAdzic, PAjinenko, IAlbrecht, ZAlderweireld, TAlekseev, GAlemany, RAllmendinger, TAllport, PAlmehed, SAmaldi, UAmapane, NAmato, SAnassontzis, EAndersson, PAndreazza, AAndringa, SAntilogus, PApel, WArnoud, YAsman, BAugustin, JAugustinus, AThe τ polarisation has been studied with the e+e- → τ+τ- data collected by the DELPHI detector at LEP in 1993, 1994 and 1995 around the Z resonance firstly through the exclusive decay channels evv̄, μvvμ, πv, ρv, and a1v and secondly with an inclusive hadronic analysis which benefits from a higher efficiency and a better systematic precision. The results have been combined with those previously published on 1990 to 1992 DELPHI data, to produce results which reflect the full LEP-1 statistics. The fit of the τ polarisation dependence on the production angle yielded the polarisation parameters Aτ = 0.1359 ± 0.0096 and Ae = 0.1382 ± 0.0116. From these results the ratio of the vector and axial-vector effective couplings v̄τ/āτ = 0.0683 ± 0.0048 and v̄e/āe = 0.0694 ± 0.0058 have been derived, compatible with e-τ universality. With the assumption of lepton universality, the ratio of vector to axial-vector effective couplings for leptons v̄ι/āι = 0.0687 ± 0.0037 was obtained, implying a value of the effective weak mixing angle sin2 θlepteff= 0.23282 ± 0.00092. |
spellingShingle | Abreu, P Adam, W Adye, T Adzic, P Ajinenko, I Albrecht, Z Alderweireld, T Alekseev, G Alemany, R Allmendinger, T Allport, P Almehed, S Amaldi, U Amapane, N Amato, S Anassontzis, E Andersson, P Andreazza, A Andringa, S Antilogus, P Apel, W Arnoud, Y Asman, B Augustin, J Augustinus, A A precise measurement of the tau polarisation at LEP-1 |
title | A precise measurement of the tau polarisation at LEP-1 |
title_full | A precise measurement of the tau polarisation at LEP-1 |
title_fullStr | A precise measurement of the tau polarisation at LEP-1 |
title_full_unstemmed | A precise measurement of the tau polarisation at LEP-1 |
title_short | A precise measurement of the tau polarisation at LEP-1 |
title_sort | precise measurement of the tau polarisation at lep 1 |
work_keys_str_mv | AT abreup aprecisemeasurementofthetaupolarisationatlep1 AT adamw aprecisemeasurementofthetaupolarisationatlep1 AT adyet aprecisemeasurementofthetaupolarisationatlep1 AT adzicp aprecisemeasurementofthetaupolarisationatlep1 AT ajinenkoi aprecisemeasurementofthetaupolarisationatlep1 AT albrechtz aprecisemeasurementofthetaupolarisationatlep1 AT alderweireldt aprecisemeasurementofthetaupolarisationatlep1 AT alekseevg aprecisemeasurementofthetaupolarisationatlep1 AT alemanyr aprecisemeasurementofthetaupolarisationatlep1 AT allmendingert aprecisemeasurementofthetaupolarisationatlep1 AT allportp aprecisemeasurementofthetaupolarisationatlep1 AT almeheds aprecisemeasurementofthetaupolarisationatlep1 AT amaldiu aprecisemeasurementofthetaupolarisationatlep1 AT amapanen aprecisemeasurementofthetaupolarisationatlep1 AT amatos aprecisemeasurementofthetaupolarisationatlep1 AT anassontzise aprecisemeasurementofthetaupolarisationatlep1 AT anderssonp aprecisemeasurementofthetaupolarisationatlep1 AT andreazzaa aprecisemeasurementofthetaupolarisationatlep1 AT andringas aprecisemeasurementofthetaupolarisationatlep1 AT antilogusp aprecisemeasurementofthetaupolarisationatlep1 AT apelw aprecisemeasurementofthetaupolarisationatlep1 AT arnoudy aprecisemeasurementofthetaupolarisationatlep1 AT asmanb aprecisemeasurementofthetaupolarisationatlep1 AT augustinj aprecisemeasurementofthetaupolarisationatlep1 AT augustinusa aprecisemeasurementofthetaupolarisationatlep1 AT abreup precisemeasurementofthetaupolarisationatlep1 AT adamw precisemeasurementofthetaupolarisationatlep1 AT adyet precisemeasurementofthetaupolarisationatlep1 AT adzicp precisemeasurementofthetaupolarisationatlep1 AT ajinenkoi precisemeasurementofthetaupolarisationatlep1 AT albrechtz precisemeasurementofthetaupolarisationatlep1 AT alderweireldt precisemeasurementofthetaupolarisationatlep1 AT alekseevg precisemeasurementofthetaupolarisationatlep1 AT alemanyr precisemeasurementofthetaupolarisationatlep1 AT allmendingert precisemeasurementofthetaupolarisationatlep1 AT allportp precisemeasurementofthetaupolarisationatlep1 AT almeheds precisemeasurementofthetaupolarisationatlep1 AT amaldiu precisemeasurementofthetaupolarisationatlep1 AT amapanen precisemeasurementofthetaupolarisationatlep1 AT amatos precisemeasurementofthetaupolarisationatlep1 AT anassontzise precisemeasurementofthetaupolarisationatlep1 AT anderssonp precisemeasurementofthetaupolarisationatlep1 AT andreazzaa precisemeasurementofthetaupolarisationatlep1 AT andringas precisemeasurementofthetaupolarisationatlep1 AT antilogusp precisemeasurementofthetaupolarisationatlep1 AT apelw precisemeasurementofthetaupolarisationatlep1 AT arnoudy precisemeasurementofthetaupolarisationatlep1 AT asmanb precisemeasurementofthetaupolarisationatlep1 AT augustinj precisemeasurementofthetaupolarisationatlep1 AT augustinusa precisemeasurementofthetaupolarisationatlep1 |