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Correlations between polarisation states of W particles in the reaction e(-)e(+)-> W-W+ at LEP2 energies 189-209 GeV
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2009 (English)In: European Physical Journal C, ISSN 1434-6044, E-ISSN 1434-6052, Vol. 63, no 4, 611-623 p.Article in journal (Refereed) Published
Abstract [en]

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 (T T), longitudinal-transverse plus transverse-longitudinal (LT) and longitudinal-longitudinal (LL) have been determined using the final states WW -> lvq (q) over bar (l = e, mu). The two-particle joint polarisation probabilities, i.e. the spin density matrix elements rho T T, rho LT, rho 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.W-, the following joint probabilities are obtained: (rho) over barT T = (67 +/- 8)%, (rho) over barL T = (30 +/- 8)%, (rho) over barL T = (3 +/- 7)%. These results are in agreement with the Standard Model predictions of 63.0%, 28.9% and 8.1%, respectively. The related polarisation cross-sections sigma(TT), sigma(LT) and sigma(LL) are also presented.

Place, publisher, year, edition, pages
2009. Vol. 63, no 4, 611-623 p.
National Category
Physical Sciences
URN: urn:nbn:se:uu:diva-127465DOI: 10.1140/epjc/s10052-009-1123-yISI: 000270978300004OAI: oai:DiVA.org:uu-127465DiVA: diva2:330193
Available from: 2010-07-15 Created: 2010-07-13 Last updated: 2010-07-15Bibliographically approved

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