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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
KTH, School of Engineering Sciences (SCI), Physics.
KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.ORCID iD: 0000-0003-3867-0336
KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.
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Number of Authors: 28352017 (English)In: European Physical Journal C, ISSN 1434-6044, E-ISSN 1434-6052, Vol. 77, no 4, article id 264Article in journal (Refereed) Published
Abstract [en]

This paper presents a measurement of the polarisation of W bosons from t (t) over bar t decays, reconstructed in events with one high-p(T) lepton and at least four jets. Data from pp collisions at the LHC were collected at root s = 8 TeV and correspond to an integrated luminosity of 20.2 fb(-1). The angle theta* 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 cos theta* 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 F-0 = 0.709 +/- 0.019, F-L = 0.299 +/- 0.015 and F-R = - 0.008 +/- 0.014, and are the most precisely measured W boson polarisation fractions to date. Limits on anomalous couplings of the W tb vertex are set.

Place, publisher, year, edition, pages
Springer-Verlag New York, 2017. Vol. 77, no 4, article id 264
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-208981ISI: 000400235900001PubMedID: 28515670Scopus ID: 2-s2.0-85018254033OAI: oai:DiVA.org:kth-208981DiVA, id: diva2:1109368
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QC 20170614

Available from: 2017-06-14 Created: 2017-06-14 Last updated: 2019-12-04Bibliographically approved

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Kastanas, Konstatinos A.Lund-Jensen, BengtSidebo, EdvinStrandberg, Jonas
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