Direct observation of longitudinally polarised W± bosons
The three different helicity states of W± bosons, produced in the reaction <math><mtext>e</mtext><msup><mi></mi><mn>+</mn></msup><mtext>e</mtext><msup><mi></mi><mn>−</mn></msup><mtext>→</mt...
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| Formato: | Articulo |
| Lenguaje: | Inglés |
| Publicado: |
2000
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| Acceso en línea: | http://sedici.unlp.edu.ar/handle/10915/78160 |
| Aporte de: |
| id |
I19-R120-10915-78160 |
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| record_format |
dspace |
| institution |
Universidad Nacional de La Plata |
| institution_str |
I-19 |
| repository_str |
R-120 |
| collection |
SEDICI (UNLP) |
| language |
Inglés |
| topic |
Ciencias Exactas Física standar model W boson W polarisation W decay |
| spellingShingle |
Ciencias Exactas Física standar model W boson W polarisation W decay Dova, María Teresa L3 Collaboration Direct observation of longitudinally polarised W± bosons |
| topic_facet |
Ciencias Exactas Física standar model W boson W polarisation W decay |
| description |
The three different helicity states of W± bosons, produced in the reaction <math><mtext>e</mtext><msup><mi></mi><mn>+</mn></msup><mtext>e</mtext><msup><mi></mi><mn>−</mn></msup><mtext>→</mtext><mtext>W</mtext><msup><mi></mi><mn>+</mn></msup><mtext>W</mtext><msup><mi></mi><mn>−</mn></msup><mtext>→</mtext><mtext>ℓνq</mtext><mtext>q</mtext><mtext>̄</mtext></math> are studied using leptonic and hadronic W decays at √s = 183 GeV and 189 GeV. The W polarisation is also measured as a function of the scattering angle between the W- and the direction of the e- beam. The analysis demonstrates that W bosons are produced with all three helicities, the longitudinal and the two transverse states. Combining the results from the two center-of-mass energies and with leptonic and hadronic W decays, the fraction of longitudinally polarised W± bosons is measured to be 0.261 ± 0.051 (stat.) ± 0.016 (syst.) in agreement with the expectation from the Standard Model. |
| format |
Articulo Articulo |
| author |
Dova, María Teresa L3 Collaboration |
| author_facet |
Dova, María Teresa L3 Collaboration |
| author_sort |
Dova, María Teresa |
| title |
Direct observation of longitudinally polarised W± bosons |
| title_short |
Direct observation of longitudinally polarised W± bosons |
| title_full |
Direct observation of longitudinally polarised W± bosons |
| title_fullStr |
Direct observation of longitudinally polarised W± bosons |
| title_full_unstemmed |
Direct observation of longitudinally polarised W± bosons |
| title_sort |
direct observation of longitudinally polarised w± bosons |
| publishDate |
2000 |
| url |
http://sedici.unlp.edu.ar/handle/10915/78160 |
| work_keys_str_mv |
AT dovamariateresa directobservationoflongitudinallypolarisedwbosons AT l3collaboration directobservationoflongitudinallypolarisedwbosons |
| bdutipo_str |
Repositorios |
| _version_ |
1764820485481168896 |