Study of W-boson polarisations and triple gauge boson couplings in the reaction e(+)e(-)-> W+W- at LEP 2
A determination of the single W spin density matrix (SDM) elements in the reaction e+e-→W+W-→lνqq (l=e/μ) is reported at centre-of-mass energies between 189 and 209∈GeV. The data sample used corresponds to an integrated luminosity of 520∈pb-1 taken by DELPHI between 1998 and 2000. The single W SDM e...
| Autori principali: | , , , , , , , , , , , , , , , , , , , , , , , , |
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| Natura: | Journal article |
| Lingua: | English |
| Pubblicazione: |
2008
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| _version_ | 1826294143105630208 |
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| author | Abdallah, J Abreu, P Adam, W Adzic, P Albrecht, T Alemany-Fernandez, R Allmendinger, T Allport, P Amaldi, U Amapane, N Amato, S Anashkin, E Andreazza, A Andringa, S Anjos, N Antilogus, P Apel, W Arnoud, Y Ask, S Asman, B Augustin, J Augustinus, A Baillon, P Ballestrero, A Bambade, P |
| author_facet | Abdallah, J Abreu, P Adam, W Adzic, P Albrecht, T Alemany-Fernandez, R Allmendinger, T Allport, P Amaldi, U Amapane, N Amato, S Anashkin, E Andreazza, A Andringa, S Anjos, N Antilogus, P Apel, W Arnoud, Y Ask, S Asman, B Augustin, J Augustinus, A Baillon, P Ballestrero, A Bambade, P |
| author_sort | Abdallah, J |
| collection | OXFORD |
| description | A determination of the single W spin density matrix (SDM) elements in the reaction e+e-→W+W-→lνqq (l=e/μ) is reported at centre-of-mass energies between 189 and 209∈GeV. The data sample used corresponds to an integrated luminosity of 520∈pb-1 taken by DELPHI between 1998 and 2000. The single W SDM elements, ρττ'W± (τ,τ'= ± 1 or 0), are determined as a function of the W- production angle with respect to the e- beam direction and are obtained from measurements of the W decay products by the application of suitable projection operators, Λττ', which assume the V-A coupling of the W-boson to fermions. The measured SDM elements are used to obtain the fraction of longitudinally polarised Ws, with the result: σ {L}{σ} = 24.9 pm4.5( pm2.2({)\% at a mean energy of 198∈GeV. The SDM elements are also used to determine the triple gauge couplings Δg1Z,Δκγ,λγ and g4Z, ̃κ_Z and ̃λ {Z} . For the CP-violating couplings the results of single parameter fits are: g4Z = -0.39+0.19-0.20 ̃κZ = -0.09+0.08-0.05 ̃λZ = -0.08±0.07 The errors are a combination of statistical and systematic errors. All results are consistent with the Standard Model. © 2008 Springer-Verlag / Società Italiana di Fisica. |
| first_indexed | 2024-03-07T03:41:05Z |
| format | Journal article |
| id | oxford-uuid:bdeb7a1c-de3e-430a-9c76-2d82eb04f83c |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-07T03:41:05Z |
| publishDate | 2008 |
| record_format | dspace |
| spelling | oxford-uuid:bdeb7a1c-de3e-430a-9c76-2d82eb04f83c2022-03-27T05:35:30ZStudy of W-boson polarisations and triple gauge boson couplings in the reaction e(+)e(-)-> W+W- at LEP 2Journal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:bdeb7a1c-de3e-430a-9c76-2d82eb04f83cEnglishSymplectic Elements at Oxford2008Abdallah, JAbreu, PAdam, WAdzic, PAlbrecht, TAlemany-Fernandez, RAllmendinger, TAllport, PAmaldi, UAmapane, NAmato, SAnashkin, EAndreazza, AAndringa, SAnjos, NAntilogus, PApel, WArnoud, YAsk, SAsman, BAugustin, JAugustinus, ABaillon, PBallestrero, ABambade, PA determination of the single W spin density matrix (SDM) elements in the reaction e+e-→W+W-→lνqq (l=e/μ) is reported at centre-of-mass energies between 189 and 209∈GeV. The data sample used corresponds to an integrated luminosity of 520∈pb-1 taken by DELPHI between 1998 and 2000. The single W SDM elements, ρττ'W± (τ,τ'= ± 1 or 0), are determined as a function of the W- production angle with respect to the e- beam direction and are obtained from measurements of the W decay products by the application of suitable projection operators, Λττ', which assume the V-A coupling of the W-boson to fermions. The measured SDM elements are used to obtain the fraction of longitudinally polarised Ws, with the result: σ {L}{σ} = 24.9 pm4.5( pm2.2({)\% at a mean energy of 198∈GeV. The SDM elements are also used to determine the triple gauge couplings Δg1Z,Δκγ,λγ and g4Z, ̃κ_Z and ̃λ {Z} . For the CP-violating couplings the results of single parameter fits are: g4Z = -0.39+0.19-0.20 ̃κZ = -0.09+0.08-0.05 ̃λZ = -0.08±0.07 The errors are a combination of statistical and systematic errors. All results are consistent with the Standard Model. © 2008 Springer-Verlag / Società Italiana di Fisica. |
| spellingShingle | Abdallah, J Abreu, P Adam, W Adzic, P Albrecht, T Alemany-Fernandez, R Allmendinger, T Allport, P Amaldi, U Amapane, N Amato, S Anashkin, E Andreazza, A Andringa, S Anjos, N Antilogus, P Apel, W Arnoud, Y Ask, S Asman, B Augustin, J Augustinus, A Baillon, P Ballestrero, A Bambade, P Study of W-boson polarisations and triple gauge boson couplings in the reaction e(+)e(-)-> W+W- at LEP 2 |
| title | Study of W-boson polarisations and triple gauge boson couplings in the reaction e(+)e(-)-> W+W- at LEP 2 |
| title_full | Study of W-boson polarisations and triple gauge boson couplings in the reaction e(+)e(-)-> W+W- at LEP 2 |
| title_fullStr | Study of W-boson polarisations and triple gauge boson couplings in the reaction e(+)e(-)-> W+W- at LEP 2 |
| title_full_unstemmed | Study of W-boson polarisations and triple gauge boson couplings in the reaction e(+)e(-)-> W+W- at LEP 2 |
| title_short | Study of W-boson polarisations and triple gauge boson couplings in the reaction e(+)e(-)-> W+W- at LEP 2 |
| title_sort | study of w boson polarisations and triple gauge boson couplings in the reaction e e gt w w at lep 2 |
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