Measurement of the W boson polarisation in t(t)over-barevents from pp collisions at root s=8 TeV in the lepton plus jets channel with ATLAS

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Aaboud, M; Aad, G; Abbott, B; Abdallah, J; Abdinov, O; Abeloos, B; AbouZeid, OS; Abraham, NL; Abramowicz, H; Abreu, H; ...Date
2017-04-11Source Title
European Physical Journal C: Particles and FieldsPublisher
SPRINGERUniversity of Melbourne Author/s
Nuti, Francesco; Milesi, Marco; ZANZI, DANIELE; Petersen, Brian; Barberio, Luigia; Kubota, Takashi; Rados, Pere; Taylor, Geoffrey; Urquijo, Phillip; Scutti, Federico; ...Affiliation
School of PhysicsMetadata
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Aaboud, M., Aad, G., Abbott, B., Abdallah, J., Abdinov, O., Abeloos, B., AbouZeid, O. S., Abraham, N. L., Abramowicz, H., Abreu, H., Abreu, R., Abulaiti, Y., Acharya, B. S., Adachi, S., Adamczyk, L., Adams, D. L., Adelman, J., Adomeit, S., Adye, T. ,... Zwalinski, L. (2017). Measurement of the W boson polarisation in t(t)over-barevents from pp collisions at root s=8 TeV in the lepton plus jets channel with ATLAS. EUROPEAN PHYSICAL JOURNAL C, 77 (4), https://doi.org/10.1140/epjc/s10052-017-4819-4.Access Status
Open AccessAbstract
This paper presents a measurement of the polarisation of W bosons from [Formula: see text] decays, reconstructed in events with one high-[Formula: see text] lepton and at least four jets. Data from pp collisions at the LHC were collected at [Formula: see text] = 8 TeV and correspond to an integrated luminosity of 20.2 fb[Formula: see text]. The angle [Formula: see text] 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 [Formula: see text] 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 [Formula: see text], [Formula: see text] and [Formula: see text], and are the most precisely measured W boson polarisation fractions to date. Limits on anomalous couplings of the Wtb vertex are set.
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