@article{c4b7856777d444fa9fe2d189251aeb31,
title = "Direct observation of longitudinally polarised W±bosons",
abstract = "The three different helicity states of W ± bosons, produced in the reaction e+ e- → W+W- →lvq{\=q} are studied using leptonic and hadronic W decays at √s = 183 GeV and 189 GeV. The W polarisation is also measured as a function of the scattering angle between the W- and the direction of the e- beam. The analysis demonstrates that W bosons are produced with all three helicities, the longitudinal and the two transverse states. Combining the results from the two center-of-mass energies and with leptonic and hadronic W decays, the fraction of longitudinally polarised W(±) bosons is measured to be 0.261 ± 0.051(stat.) ± 0.016(syst.) in agreement with the expectation from the Standard Model.",
author = "{L3 Collaboration} and M. Acciarri and P. Achard and O. Adriani and M. Aguilar-Benitez and J. Alcaraz and G. Alemanni and J. Allaby and A. Aloisio and Alviggi, {M. G.} and G. Ambrosi and H. Anderhub and Andreev, {V. P.} and T. Angelescu and F. Anselmo and A. Arefiev and T. Azemoon and T. Aziz and P. Bagnaia and L. Baksay and A. Balandras and Ball, {R. C.} and S. Banerjee and Sw Banerjee and A. Barczyk and R. Barillere and L. Barone and P. Bartalini and M. Basile and R. Battiston and A. Bay and F. Becattini and U. Becker and F. Behner and L. Bellucci and J. Berdugo and P. Berges and B. Bertucci and Betev, {B. L.} and S. Bhattacharya and M. Biasini and A. Biland and Blaising, {J. J.} and Blyth, {S. C.} and Bobbink, {G. J.} and A. Bohm and L. Boldizsar and B. Borgia and D. Bourilkov and Stickland, {D. P.} and C. Tully",
note = "Publisher Copyright: (C) 2000 Elsevier Science B.V.",
year = "2000",
month = feb,
day = "10",
doi = "10.1016/S0370-2693(99)01489-6",
language = "English (US)",
volume = "474",
pages = "194--204",
journal = "Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics",
issn = "0370-2693",
publisher = "Elsevier B.V.",
number = "1-2",
}