Measurement of the W boson polarization in top decay at CDF at √s = 1.8 TeV
The polarization of the W boson in t →Wb decay is unambiguously predicted by the standard model of electroweak interactions and is a powerful test of our understanding of the tbW vertex. We measure this polarization from the invariant mass of the b quark from t → Wb and the lepton from W → lν whose...
| Main Authors: | , , , , , , , , , , , , , , , , , , , , , , , , |
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| Format: | Journal article |
| Language: | English |
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2005
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| _version_ | 1797078328198299648 |
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| author | Acosta, D Affolder, T Albrow, MG Ambrose, D Amidei, D Anikeev, K Antos, J Apollinari, G Arisawa, T Artikov, A Ashmanskas, W Azfar, F Azzi-Bacchetta, P Bacchetta, N Bachacou, H Badgett, W Barbaro-Galtieri, A Barnes, V Barnett, B Baroiant, S Barone, M Bauer, G Bedeschi, F Behari, S Belforte, S |
| author_facet | Acosta, D Affolder, T Albrow, MG Ambrose, D Amidei, D Anikeev, K Antos, J Apollinari, G Arisawa, T Artikov, A Ashmanskas, W Azfar, F Azzi-Bacchetta, P Bacchetta, N Bachacou, H Badgett, W Barbaro-Galtieri, A Barnes, V Barnett, B Baroiant, S Barone, M Bauer, G Bedeschi, F Behari, S Belforte, S |
| author_sort | Acosta, D |
| collection | OXFORD |
| description | The polarization of the W boson in t →Wb decay is unambiguously predicted by the standard model of electroweak interactions and is a powerful test of our understanding of the tbW vertex. We measure this polarization from the invariant mass of the b quark from t → Wb and the lepton from W → lν whose momenta measure the W decay angle and direction of motion, respectively. In this paper we present a measurement of the decay rate (f V+A) of the W produced from the decay of the top quark in the hypothesis of V + A structure of the tWb vertex. We find no evidence for the nonstandard V + A vertex and set a limit on fV+A < 0.80 at 95% confidence level. By combining this result with a complementary observable in the same data, we assign a limit on fv+A < 0.61 at 95% CL. This corresponds to a constraint on the right-handed helicity component of the W polarization of f+ < 0.18 at 95% CL. This limit is the first significant direct constraint on fV+A in top decay. © 2005 The American Physical Society. |
| first_indexed | 2024-03-07T00:30:30Z |
| format | Journal article |
| id | oxford-uuid:7f9f9a2e-9f3f-407b-8b3c-0464812dc295 |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-07T00:30:30Z |
| publishDate | 2005 |
| record_format | dspace |
| spelling | oxford-uuid:7f9f9a2e-9f3f-407b-8b3c-0464812dc2952022-03-26T21:18:09ZMeasurement of the W boson polarization in top decay at CDF at √s = 1.8 TeVJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:7f9f9a2e-9f3f-407b-8b3c-0464812dc295EnglishSymplectic Elements at Oxford2005Acosta, DAffolder, TAlbrow, MGAmbrose, DAmidei, DAnikeev, KAntos, JApollinari, GArisawa, TArtikov, AAshmanskas, WAzfar, FAzzi-Bacchetta, PBacchetta, NBachacou, HBadgett, WBarbaro-Galtieri, ABarnes, VBarnett, BBaroiant, SBarone, MBauer, GBedeschi, FBehari, SBelforte, SThe polarization of the W boson in t →Wb decay is unambiguously predicted by the standard model of electroweak interactions and is a powerful test of our understanding of the tbW vertex. We measure this polarization from the invariant mass of the b quark from t → Wb and the lepton from W → lν whose momenta measure the W decay angle and direction of motion, respectively. In this paper we present a measurement of the decay rate (f V+A) of the W produced from the decay of the top quark in the hypothesis of V + A structure of the tWb vertex. We find no evidence for the nonstandard V + A vertex and set a limit on fV+A < 0.80 at 95% confidence level. By combining this result with a complementary observable in the same data, we assign a limit on fv+A < 0.61 at 95% CL. This corresponds to a constraint on the right-handed helicity component of the W polarization of f+ < 0.18 at 95% CL. This limit is the first significant direct constraint on fV+A in top decay. © 2005 The American Physical Society. |
| spellingShingle | Acosta, D Affolder, T Albrow, MG Ambrose, D Amidei, D Anikeev, K Antos, J Apollinari, G Arisawa, T Artikov, A Ashmanskas, W Azfar, F Azzi-Bacchetta, P Bacchetta, N Bachacou, H Badgett, W Barbaro-Galtieri, A Barnes, V Barnett, B Baroiant, S Barone, M Bauer, G Bedeschi, F Behari, S Belforte, S Measurement of the W boson polarization in top decay at CDF at √s = 1.8 TeV |
| title | Measurement of the W boson polarization in top decay at CDF at √s = 1.8 TeV |
| title_full | Measurement of the W boson polarization in top decay at CDF at √s = 1.8 TeV |
| title_fullStr | Measurement of the W boson polarization in top decay at CDF at √s = 1.8 TeV |
| title_full_unstemmed | Measurement of the W boson polarization in top decay at CDF at √s = 1.8 TeV |
| title_short | Measurement of the W boson polarization in top decay at CDF at √s = 1.8 TeV |
| title_sort | measurement of the w boson polarization in top decay at cdf at √s 1 8 tev |
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