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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
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 | ||||||
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| 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: |
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| 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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