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Free accessOther version: http://link.springer.com/article/10.1007%2FJHEP06%282012%29088
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unige:39869 
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Measurement of the W boson polarization in top quark decays with the ATLAS detector |
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| Collaboration | With : Abdelalim Aly, Ahmed Aly / Alexandre, Gauthier / Backes, Moritz / Barone, Gaetano / Bell, Paul / Bell, William / Benhar Noccioli, Eleonora / Blondel, Alain / Bucci, Francesca / Clark, Allan Geoffrey / Dao, Valerio / Doglioni, Caterina / Ferrere, Didier / Gadomski, Szymon / Gonzalez Sevilla, Sergio / Goulette, Marc / Iacobucci, Giuseppe / La Rosa, Alessandro / Lister, Alison / Martin Dit Latour, Bertrand / Mermod, Philippe / Mora Herrera, Maria Clemencia Rosario / Nektarijevic, Snezana / Nikolics, Katalin / Pasztor, Arpad / Picazio, Attilio / Pohl, Martin / Rosbach, Kilian / Rosselet, Laurent / Wu, Xin | |
| Published in | Journal of High Energy Physics. 2012, vol. 088, p. 45 | |
| Abstract | 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. | |
| Keywords | Hadron-Hadron Scattering | |
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Article (Published version) (862 Kb) - Free access Other version: http://link.springer.com/article/10.1007%2FJHEP06%282012%29088 |
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| Citation (ISO format) | ATLAS COLLABORATION. Measurement of the W boson polarization in top quark decays with the ATLAS detector. In: Journal of High Energy Physics, 2012, vol. 088, p. 45. https://archive-ouverte.unige.ch/unige:39869 |
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