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Measurement of the W boson polarisation in tt¯ events from pp collisions at √s = 8 TeV in the lepton + jets channel with ATLAS

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ATLAS Collaboration (Including: Beckingham, M., Ennis, Joseph Stanford, Farrington, Sinead, Harrison, P. F., Jeske, C., Jones, G., Martin, T. A., Murray, W., Pianori, E. and Spangenberg, Martin). (2017) Measurement of the W boson polarisation in tt¯ events from pp collisions at √s = 8 TeV in the lepton + jets channel with ATLAS. European Physical Journal C, 77 (4). 264. doi:10.1140/epjc/s10052-017-4819-4

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Official URL: http://doi.org/10.1140/epjc/s10052-017-4819-4

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Abstract

This paper presents a measurement of the polarisation of W bosons from tt¯ decays, reconstructed in events with one high-pT lepton and at least four jets. Data from pp collisions at the LHC were collected at s = 8 TeV and correspond to an integrated luminosity of 20.2 fb-1. The angle θ∗ between the b-quark from the top quark decay and a direct W boson decay product in the W boson rest frame is sensitive to the W boson polarisation. Two different W decay products are used as polarisation analysers: the charged lepton and the down-type quark for the leptonically and hadronically decaying W boson, respectively. The most precise measurement of the W boson polarisation via the distribution of cosθ∗ is obtained using the leptonic analyser and events in which at least two of the jets are tagged as b-quark jets. The fitted fractions of longitudinal, left- and right-handed polarisation states are F0=0.709±0.019, FL=0.299±0.015 and FR=-0.008±0.014, and are the most precisely measured W boson polarisation fractions to date. Limits on anomalous couplings of the Wtb vertex are set.

Item Type: Journal Article
Divisions: Faculty of Science > Physics
SWORD Depositor: Library Publications Router
Journal or Publication Title: European Physical Journal C
Publisher: Springer
ISSN: 1434-6044
Official Date: 26 April 2017
Dates:
DateEvent
26 April 2017Published
11 April 2017Accepted
Volume: 77
Number: 4
Article Number: 264
DOI: 10.1140/epjc/s10052-017-4819-4
Status: Peer Reviewed
Publication Status: Published
Publisher Statement: ** From Springer Nature via Jisc Publications Router. ** History: ** received: 09-12-2016 ** collection: 01-04-2017 ** accepted: 11-04-2017 ** epub: 26-04-2017 ** Licence for this article: http://creativecommons.org/licenses/by/4.0/
Access rights to Published version: Open Access

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