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.

Measurement of W polarisation at LEP / Achard, P., Adriani, O., Aguilar Benitez, M., Alcaraz, J., Alemanni, G., Allaby, J., Aloisio, A., Alviggi, M., Anderhub, H., A. V., ., Anselmo, F., Arefiev, A., Azemoon, T., Aziz, T., Bagnaia, P., Bajo, A., Baksay, G., Baksay, L., Baldew, S.V., Banerjee, S., et al.. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - STAMPA. - 557:(2003), pp. 147-156. [10.1016/S0370-2693(03)00172-2]

Measurement of W polarisation at LEP

ALOISIO, ALBERTO;ALVIGGI, MARIAGRAZIA;CHIEFARI, GIOVANNI;DELLA VOLPE, DOMENICO;L. Lista;MEROLA, LEONARDO;NAPOLITANO, MARCO;PATRICELLI, SERGIO;SCIACCA, CRISOSTOMO;
2003

Abstract

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.
2003
Measurement of W polarisation at LEP / Achard, P., Adriani, O., Aguilar Benitez, M., Alcaraz, J., Alemanni, G., Allaby, J., Aloisio, A., Alviggi, M., Anderhub, H., A. V., ., Anselmo, F., Arefiev, A., Azemoon, T., Aziz, T., Bagnaia, P., Bajo, A., Baksay, G., Baksay, L., Baldew, S.V., Banerjee, S., et al.. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - STAMPA. - 557:(2003), pp. 147-156. [10.1016/S0370-2693(03)00172-2]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11588/469318
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