Measurement of W polarisation at LEP
Physics Letters B 557,3-4 (2003) 147-156;
The three different helicity states of W bosons produced in the reaction e(+)e(-) --> W+W- --> lvqq' at LEP are studied using leptonic and hadronic W decays. Data at centre-of-mass energies roots = 183-209 GeV are used to measure the polarisation of W bosons, and its dependence on the W boson production angle. The fraction of longitudinally polarised W bosons is measured to be 0.218 +/- 0.027 +/- 0.016 where the first uncertainty is statistical and the second systematic, in agreement with the Standard Model expectation. (C) 2003 Published by Elsevier Science B.V.
(un)stable w+w production;; monte-carlo program;; l3 experiment;; pair production;; energies;; detector;; exponentiation;; generator
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