Acciarri, M. ; Achard, P. ; Adriani, O. ; Aguilar-Benitez, M. ; Gurtu, A. ; et., al (2000) Direct observation of longitudinally polarised W± bosons Physics Letters B, 474 (1-2). pp. 194-204. ISSN 0370-2693
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Official URL: http://www.sciencedirect.com/science/article/pii/S...
Related URL: http://dx.doi.org/10.1016/S0370-2693(99)01489-6
Abstract
The three different helicity states of W± bosons, produced in the reaction e +e - →W+W-→ℓ νqq̅are studied using leptonic and hadronic W decays at √s=183GeV 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.
| Item Type: | Article |
|---|---|
| Source: | Copyright of this article belongs to Elsevier Science. |
| ID Code: | 84056 |
| Deposited On: | 24 Feb 2012 05:34 |
| Last Modified: | 24 Feb 2012 05:34 |
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