Detalle de: Correlations between polarisation states of W particles in the reaction e − e +→W − W + at LEP2 energies 189–209 GeV
| Title | Correlations between polarisation states of W particles in the reaction e − e +→W − W + at LEP2 energies 189–209 GeV |
| Abstract |
In a study of the reaction e − e +→W − W + with the DELPHI detector, the probabilities of the two W particles occurring in the joint polarisation states transverse–transverse (TT), longitudinal–transverse plus transverse–longitudinal (LT) and longitudinal–longitudinal (LL) have been determined using the final states $WW{\rightarrow}l\nu q\bar{q}$ (l=e,μ). The two-particle joint polarisation probabilities, i.e. the spin density matrix elements ρ TT , ρ LT , ρ LL , are measured as functions of the W − production angle, $\theta _{W^{-}}$ , at an average reaction energy of 198.2 GeV. Averaged over all $\cos\theta_{W^{-}}$ , the following joint probabilities are obtained: $$\bar{\rho}_{TT}=(67\pm8)\%,$$ $$\bar{\rho}_{LT}=(30\pm8)\%,$$ $$\bar{\rho}_{LL}=(3\pm7)\%.$$ These results are in agreement with the Standard Model predictions of 63.0%, 28.9% and 8.1%, respectively. The related polarisation cross-sections σ TT , σ LT and σ LL are also presented. |
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| Doi | 10.1140/epjc/s10052-009-1123-y |
| Publication Date | 1 Sep 2009 |
| Publication Type | Article |
| Researcher | David Rodríguez González |
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