Journal
EUROPEAN PHYSICAL JOURNAL C
Volume 77, Issue 4, Pages -Publisher
SPRINGER
DOI: 10.1140/epjc/s10052-017-4819-4
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- ANPCyT, Argentina
- YerPhI, Armenia
- ARC, Australia
- BMWFW, Austria
- FWF, Austria
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- CNPq, Brazil
- FAPESP, Brazil
- NSERC, Canada
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- CERN
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- CAS, China
- MOST, China
- NSFC, China
- COLCIENCIAS, Colombia
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- MPO CR, Czech Republic
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- DNRF, Denmark
- DNSRC, Denmark
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- CEA-DSM/IRFU, France
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- I-CORE and Benoziyo Center, Israel
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- NCN, Poland
- FCT, Portugal
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- DOE, United States of America
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- Region Auvergne and Fondation Partager le Savoir, France
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- Minerva, Israel
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- ATLAS Tier-1 facilities at TRIUMF (Canada)
- NDGF (Denmark, Norway, Sweden)
- CC-IN2P3 (France)
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- NL-T1 (Netherlands)
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- ASGC (Taiwan)
- RAL (UK)
- Tier-2 facilities worldwide
- large non-WLCG resource providers
- Direct For Mathematical & Physical Scien
- Division Of Physics [1624739] Funding Source: National Science Foundation
- ICREA Funding Source: Custom
- Science and Technology Facilities Council [1366825, ST/H001093/1, ST/I005846/1, PP/E000347/1, ST/L001144/1, ST/J00488X/1, ST/H001093/2, ST/M001431/1, ST/N000447/1, ST/K003666/1, ST/L005662/1, ST/N000420/1, GRIDPP, ST/M006417/1, ST/K001361/1] Funding Source: researchfish
- STFC [ST/M006417/1, ST/L006162/1, ST/I005846/1, PP/E000347/1, ST/K001361/1, ST/N000277/1, ST/J00488X/1, ST/H001093/2, ST/L001144/1, ST/H001093/1, ST/N000307/1, ST/N000420/1, ST/M001431/1, ST/N000447/1, ST/L005662/1, ST/K003666/1] Funding Source: UKRI
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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.
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