| Auteurs | G. Aad, . et al, S. Bentvelsen, A.P. Colijn, A. Doxiadis, H. Garitaonandia, D.A.A. Geerts, M. Gosselink, P. de Jong, M.S. Kayl, Z. van Kesteren, E. Koffeman, E. van der Kraaij, H.C. Lee, R.H.L. van der Leeuw, F. Linde, J. Mechnich, I. Mussche, L. de Nooij, J.P. Ottersbach, M. Tsiakiris, J.C. Vermeulen, M. Vreeswijk, I. van Vulpen, E. van der Poel, M. Rijpstra, N. Ruckstuhl | | Titel | Measurement of the W boson polarization in top quark decays with the ATLAS detector |
| Tijdschrift | The Journal of High Energy Physics |
| Jaargang | 2012 |
| Jaar | 2012 |
| Nummer | 6 |
| Pagina's | 88- |
| ISSN | 11266708 |
| Faculteit | Faculteit der Natuurwetenschappen, Wiskunde en Informatica |
| Instituut/afd. | FNWI: Institute for High Energy Physics (IHEF) |
| Samenvatting | This paper presents measurements of the polarization of W bosons in top quark decays, derived from tt− events with missing transverse momentum, one charged lepton and at least four jets, or two charged leptons and at least two jets. Data from pp collisions at a centre-of-mass energy of 7 TeV were collected with the ATLAS experiment at the LHC and correspond to an integrated luminosity of 1.04 fb−1. The measured fractions of longitudinally, left- and right-handed polarization are F 0 = 0.67 ± 0.07, F L = 0.32 ± 0.04 and F R = 0.01 ± 0.05, in agreement with the Standard Model predictions. As the polarization of the W bosons in top quark decays is sensitive to the Wtb vertex Lorentz structure and couplings, the measurements were used to set limits on anomalous contributions to the Wtb couplings. |
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