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Article
Report number arXiv:1702.08309 ; CERN-EP-2017-011
Title Probing the Wtb vertex structure in t-channel single-top-quark production and decay in pp collisions at s=8 TeV with the ATLAS detector
Related titleProbing the Wtb vertex structure in t-channel single-top-quark production and decay in pp collisions at s=8 TeV with the ATLAS detector
Author(s) ATLAS Collaboration  Εμφάνιση και των 2852 συγγραφέων
Publication 2017-04-20
Imprint 24 Feb 2017
Number of pages 48
Note 48 pages in total, author list starting page 32, 10 figures, 5 tables. Submitted to JHEP. All figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/TOPQ-2014-17/
In: JHEP 04 (2017) 124
DOI 10.1007/JHEP04(2017)124
Subject category Particle Physics - Experiment
Accelerator/Facility, Experiment CERN LHC ; ATLAS
Free keywords flavor physics ; top physics ; experimental results
Abstract To probe the Wtb 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 fb1, 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.
Copyright/License arXiv nonexclusive-distrib. 1.0
Preprint: © 2017-2025 CERN (License: CC-BY-4.0)



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Email contact: fmalek@lpsc.in2p3.fr


 Δημιουργία εγγραφής 2017-02-24, τελευταία τροποποίηση 2024-08-17


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