TY  - JOUR
T1  - Measurement of the W boson polarization in top quark decays with the ATLAS detector
T2  - Journal of High Energy Physics
N2  - This paper presents measurements of the polarization of W bosons in top quark decays, derived from \(t\overline{t}\) 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.
KW  - hadron-hadron scattering
Y1  - 2012
UR  - https://opus.bibliothek.uni-wuerzburg.de/frontdoor/index/index/docId/12741
UR  - https://nbn-resolving.org/urn:nbn:de:bvb:20-opus-127417
VL  - 06
IS  - 88
ER  -