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...

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প্রধান লেখক: 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
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.
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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
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