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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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Abdallah, J., Abreu, P., Adam, W., Adzic, P., Albrecht, T., Alemany-Fernandez, R., Allmendinger, T., Allport, P. P., Amaldi, U., Amapane, N. et al.
(2009) Correlations between polarisation states of W particles in the reaction e(-)e(+)-> W-W+ at LEP2 energies 189-209 GeV. The European Physical Journal C, Vol.63 (No.4). pp. 611-623. doi:10.1140/epjc/s10052-009-1123-y

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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 (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.

Item Type: Journal Article
Subjects: Q Science > QC Physics
Divisions: Faculty of Science > Physics
Journal or Publication Title: The European Physical Journal C
Publisher: Springer
ISSN: 1434-6044
Official Date: October 2009
Dates:
DateEvent
October 2009Published
Volume: Vol.63
Number: No.4
Number of Pages: 13
Page Range: pp. 611-623
DOI: 10.1140/epjc/s10052-009-1123-y
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Open Access
Funder: Austrian Federal Ministry of Education, Science and Culture, FNRS-FWO, Flanders Institute, Belgian Federal Office for Scientific, Technical and Cultural affairs (OSTC), Belgium, CNPq, CAPES, FUJB, FAPERJ, Brazil, Ministry of Education of the Czech Republic, Academy of Sciences of the Czech Republic, Commission of the European Communities (DG XII), Direction des Sciences de la Matiere, CEA, France, Bundesministerium fur Bildung, Forschung und Technologie, Germany, General Secretariat for Research and Technology, Greece, National Science Foundation (NWO), Foundation for Research on Matter (FOM), Norwegian Research Council, State Committee for Scientific Research, Ministry of Science and Technology, Republic of Slovenia, CICYT, Spain, Swedish Research Council, Science and Technology Facilities Council, UK, Department of Energy, USA, EEC RTN
Grant number: GZ 616.364/2-III/2a/98, LC527, AV0Z10100502, SPUB-M/CERN/PO3/DZ296/2000, SPUBM/CERN/PO3/DZ297/2000, 2P03B 104 19, 2P03B 69 23, 95/5195/134, AEN99-0950, AEN99-0761, DE-FG02-01ER41155, HPRN-CT00292-2002

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