Measurements of Long-Range Azimuthal Anisotropies and Associated Fourier Coefficients for pp Collisions at √s̅ = 5.02 and 13 TeV and p + Pb Collisions at √{s_{NN}} = 5.02 TeV with the ATLAS Detector

dc.contributor.VIAF250674117 (Izen, JM)en_US
dc.contributor.authorAaboud, M.en_US
dc.contributor.authorAad, G.en_US
dc.contributor.authorAbbott, B.en_US
dc.contributor.authorAbdallah, J.en_US
dc.contributor.authorAbdinov, O.en_US
dc.contributor.authorAbeloos, B.en_US
dc.contributor.authorAbouZeid, O. S.en_US
dc.contributor.authorIzen, Joseph M.en_US
dc.contributor.authorMeirose, Bernharden_US
dc.contributor.authorReeves, Kendallen_US
dc.contributor.authorKurth, Matthew G.en_US
dc.contributor.authorLeyton, Michaelen_US
dc.contributor.authorATLAS Collaborationen_US
dc.contributor.utdAuthorIzen, Joseph M.en_US
dc.contributor.utdAuthorMeirose, Bernharden_US
dc.contributor.utdAuthorReeves, Kendallen_US
dc.contributor.utdAuthorKurth, Matthew G.en_US
dc.contributor.utdAuthorLeyton, Michaelen_US
dc.date.accessioned2018-05-15T19:51:26Z
dc.date.available2018-05-15T19:51:26Z
dc.date.created2017-04-26en_US
dc.date.issued2018-05-15
dc.description.abstractThis paper presents a measurement of the polarisation of W bosons from tt̅ 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 √s̅ = 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 cos θ* 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, 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 Wtb vertex are set.en_US
dc.description.departmentSchool of Natural Sciences and Mathematicsen_US
dc.identifier.bibliographicCitationAaboud, M., G. Aad, B. Abbott, J. Abdallah, et al. 2017. "Measurement of the W boson polarisation in tt̅ events from pp collisions at √s̅ = 8 TeV in the lepton plus jets channel with ATLAS." European Physical Journal C 77(4), doi:10.1140/epjc/s10052-017-4819-4en_US
dc.identifier.issn1434-6044en_US
dc.identifier.issue4en_US
dc.identifier.urihttp://hdl.handle.net/10735.1/5731
dc.identifier.volume77en_US
dc.language.isoenen_US
dc.publisherSpringeren_US
dc.relation.urihttp://dx.doi.org/10.1140/epjc/s10052-017-4819-4
dc.rightsCC BY 4.0 (Attribution)en_US
dc.rights©2017 CERN, for the ATLAS Collaborationen_US
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/en_US
dc.sourceEuropean Physical Journal C
dc.subjectQuarksen_US
dc.subjectPartonsen_US
dc.subjectLarge Hadron Collider (France and Switzerland)en_US
dc.subjectW bosonsen_US
dc.subjectProton-proton interactionsen_US
dc.subjectPolarization (Nuclear physics)en_US
dc.titleMeasurements of Long-Range Azimuthal Anisotropies and Associated Fourier Coefficients for pp Collisions at √s̅ = 5.02 and 13 TeV and p + Pb Collisions at √{s_{NN}} = 5.02 TeV with the ATLAS Detectoren_US
dc.type.genrearticleen_US

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