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The W Boson Spin Density Matrix at OPAL
The spin states of W bosons in e<super>+</super>e<super>−</super> → W<super>+</super>W<super>−</super> → qq¯<super>′</super>ℓν<sub> ℓ</sub> events r...
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| Lenguaje: | eng |
| Publicado: |
Victoria U.
2007
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| Acceso en línea: | http://cds.cern.ch/record/878813 |
| _version_ | 1780908026461421568 |
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| author | Bailey, I R |
| author_facet | Bailey, I R |
| author_sort | Bailey, I R |
| collection | CERN |
| description | The spin states of W bosons in e<super>+</super>e<super>−</super> → W<super>+</super>W<super>−</super> → qq¯<super>′</super>ℓν<sub> ℓ</sub> events recorded by the OPAL detector at LEP are determined by an analysis of the angular distributions of their decay products. This information is used to calculate polarised differential cross-sections and to search for CP-violating effects. Results are presented for W bosons produced in e<super> +</super>e<super>−</super> collisions with centre- of-mass energies between 183 GeV and 209 GeV. The average percentage of longitudinally polarised W bosons measured from the data is found to be (23.9 ± 2.1 ± 1.1)% compared to a Standard Model prediction of (23.9 ± 0.1)%. All results are consistent with CP conservation. |
| id | cern-878813 |
| institution | Organización Europea para la Investigación Nuclear |
| language | eng |
| publishDate | 2007 |
| publisher | Victoria U. |
| record_format | invenio |
| spelling | cern-8788132019-09-30T06:29:59Zhttp://cds.cern.ch/record/878813engBailey, I RThe W Boson Spin Density Matrix at OPALDetectors and Experimental TechniquesParticle Physics - ExperimentThe spin states of W bosons in e<super>+</super>e<super>−</super> → W<super>+</super>W<super>−</super> → qq¯<super>′</super>ℓν<sub> ℓ</sub> events recorded by the OPAL detector at LEP are determined by an analysis of the angular distributions of their decay products. This information is used to calculate polarised differential cross-sections and to search for CP-violating effects. Results are presented for W bosons produced in e<super> +</super>e<super>−</super> collisions with centre- of-mass energies between 183 GeV and 209 GeV. The average percentage of longitudinally polarised W bosons measured from the data is found to be (23.9 ± 2.1 ± 1.1)% compared to a Standard Model prediction of (23.9 ± 0.1)%. All results are consistent with CP conservation.Victoria U.oai:cds.cern.ch:8788132007 |
| spellingShingle | Detectors and Experimental Techniques Particle Physics - Experiment Bailey, I R The W Boson Spin Density Matrix at OPAL |
| title | The W Boson Spin Density Matrix at OPAL |
| title_full | The W Boson Spin Density Matrix at OPAL |
| title_fullStr | The W Boson Spin Density Matrix at OPAL |
| title_full_unstemmed | The W Boson Spin Density Matrix at OPAL |
| title_short | The W Boson Spin Density Matrix at OPAL |
| title_sort | w boson spin density matrix at opal |
| topic | Detectors and Experimental Techniques Particle Physics - Experiment |
| url | http://cds.cern.ch/record/878813 |
| work_keys_str_mv | AT baileyir thewbosonspindensitymatrixatopal AT baileyir wbosonspindensitymatrixatopal |