Measurement of W polarisation at LEP

Measurement of W polarisation at LEP

The three different helicity states of W bosons produced in the reaction e+e−→W+W−→ℓνqq̄′ at LEP are studied using leptonic and hadronic W decays. Data at centre-of-mass energies s=183–209 GeV are used to measure the polarisation of W bosons, and its dependence on the W boson production angle. The f...

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Veröffentlicht in:Physics letters. B 2003-04, Vol.557 (3-4), p.147-156
Hauptverfasser: Aguilar-Benitez, M., Alcaraz, J., Aloisio, A., Alviggi, M.G., Arefiev, A., Bagnaia, P., Bajo, A., Banerjee, Sw, Bellucci, L., Biglietti, M., Biland, A., Blaising, J.J., Böhm, A., Boldizsar, L., Branson, J.G., Capell, M., Cartacci, A., Cavallari, F., Cavallo, N., Chemarin, M., Chen, H.S., Chiefari, G., Cifarelli, L., de la Cruz, B., de Asmundis, R., Debreczeni, J., De Salvo, A., Dionisi, C., El Hage, A., Engler, A., Extermann, P., Fisk, I., Freudenreich, K., Garcia-Abia, P., van Gulik, R., Hatzifotiadou, D., Hervé, A., Hirschfelder, J., Hofer, H., Käfer, D., Kaur, M., Kim, J.K., Kirkby, J., Lebeau, M., Lecomte, P., Le Goff, J.M., Levtchenko, M., Li, C., Linde, F.L., Lohmann, W., Longo, E., Lu, Y.S., Luminari, L., Mans, J., Mele, S., Merola, L., Meschini, M., Milcent, H., Mirabelli, G., Palomares, C., Paolucci, P., Passaleva, G., Paus, C., Pauss, F., Pistolesi, E., Prokofiev, D., Ranieri, R., Ren, D., Rescigno, M., Riemann, S., Roe, B.P., Rosenbleck, C., Rykaczewski, H., Sakharov, A., Schegelsky, V., Servoli, L., Shevchenko, S., Shivarov, N., Shumilov, E., Souga, C., Swain, J.D., Tarjan, P., Taylor, L., Teyssier, D., Tóth, J., Vasquez, R., Veszpremi, V., Vesztergombi, G., Vetlitsky, I., Villa, S., Wadhwa, M., Weber, M., Wilkens, H., Wynhoff, S., Xu, Z.Z., Yang, B.Z., Yang, H.J., Yeh, S.C., Zhuang, H.L., Zöller, M.
Format: Artikel
Sprache:eng
Schlagworte:
High Energy Physics - Experiment
Physics
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Zusammenfassung:The three different helicity states of W bosons produced in the reaction e+e−→W+W−→ℓνqq̄′ at LEP are studied using leptonic and hadronic W decays. Data at centre-of-mass energies s=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.
ISSN:0370-2693
1873-2445
DOI:10.1016/S0370-2693(03)00172-2