ATLAS Collaboration (Including: Beckingham, M., Ennis, Joseph Stanford, Farrington, Sinead, Harrison, P. F., Jeske, C., Jones, G. (Graham), Martin, T. A., Murray, W., Pianori, E. and Spangenberg, Martin). (2017) Probing the W tb vertex structure in t-channel single-top-quark production and decay in pp collisions at s=8 TeV with the ATLAS detector. Journal of High Energy Physics, 2017 (4). 124. doi:10.1007/jhep04(2017)124

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Abstract

To probe the W tb vertex structure, top-quark and W -boson polarisation observables are measured from t-channel single-top-quark events produced in proton-proton collisions at a centre-of-mass energy of 8 TeV. The dataset corresponds to an integrated luminosity of 20.2 fb−1, recorded with the ATLAS detector at the LHC. Selected events contain one isolated electron or muon, large missing transverse momentum and exactly two jets, with one of them identified as likely to contain a b-hadron. Stringent selection requirements are applied to discriminate t-channel single-top-quark events from background. The polarisation observables are extracted from asymmetries in angular distributions measured with respect to spin quantisation axes appropriately chosen for the top quark and the W boson. The asymmetry measurements are performed at parton level by correcting the observed angular distributions for detector effects and hadronisation after subtracting the background contributions. The measured top-quark and W -boson polarisation values are in agreement with the Standard Model predictions. Limits on the imaginary part of the anomalous coupling gR are also set from model-independent measurements.

Item Type:	Journal Article
Subjects:	Q Science > QC Physics
Divisions:	Faculty of Science > Physics
SWORD Depositor:	Library Publications Router
Library of Congress Subject Headings (LCSH):	Hadrons -- Scattering, Particles (Nuclear physics), Quarks, Bosons
Journal or Publication Title:	Journal of High Energy Physics
Publisher:	Springer Berlin Heidelberg
ISSN:	1029-8479
Official Date:	20 April 2017
Dates:	Date Event 20 April 2017 Published 7 April 2017 Accepted
Volume:	2017
Number:	4
Article Number:	124
DOI:	10.1007/jhep04(2017)124
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Open Access
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