Journal
JOURNAL OF HIGH ENERGY PHYSICS
Volume -, Issue 8, Pages -Publisher
SPRINGER
DOI: 10.1007/JHEP08(2020)051
Keywords
Hadron-Hadron scattering (experiments); Top physics
Categories
Funding
- ANPCyT, Argentina
- YerPhI, Armenia
- ARC, Australia
- BMWFW, Austria
- FWF, Austria
- ANAS, Azerbaijan
- SSTC, Belarus
- CNPq, Brazil
- FAPESP, Brazil
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- MSMT CR, Czech Republic
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- DNSRC, Denmark
- IN2P3-CNRS, CEA-DRF/IRFU, France
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- Benoziyo Center, Israel
- INFN, Italy
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- NCN, Poland
- FCT, Portugal
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- European Union
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- Academy of Finland (Finland)
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- CNRS/IN2P3 (France)
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- NASU (Ukraine)
- NSF (U.S.A.)
- Marie-Curie programme
- European Research Council
- Horizon 2020 Grant [675440, 752730, 765710]
- Leventis Foundation
- A.P. Sloan Foundation
- Alexander von Humboldt Foundation
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- Fonds pour la Formationa la Recherche dans l'Industrie et dans l'Agriculture (FRIA-Belgium)
- Agentschap voor Innovatie door Wetenschap en Technologie (IWT-Belgium)
- FWO (Belgium) under the Excellence of Science - EOS [30820817]
- Beijing Municipal Science & Technology Commission [Z191100007219010]
- Ministry of Education, Youth and Sports (MEYS) of the Czech Republic
- Deutsche Forschungsgemeinschaft (DFG) under Germany's Excellence Strategy [EXC 2121, 390833306]
- Lendulet (Momentum) Programme
- Janos Bolyai Research Scholarship of the Hungarian Academy of Sciences
- New National Excellence Program UNKP
- NKFIA (Hungary) [123842, 123959, 124845, 124850, 125105, 128713, 128786, 129058]
- Council of Science and Industrial Research, India
- HOMING PLUS programme of the Foundation for Polish Science
- Mobility Plus programme of the Ministry of Science and Higher Education
- National Science Center (Poland) [Harmonia 2014/14/M/ST2/00428, Opus 2014/13/B/ST2/02543, 2014/15/B/ST2/03998, 2015/19/B/ST2/02861, Sonata-bis 2012/07/E/ST2/01406]
- National Priorities Research Program by Qatar National Research Fund
- Ministry of Science and Education (Russia) [14.W03.31.0026]
- Tomsk Polytechnic University Competitiveness Enhancement Program (Russia)
- Nauka Project (Russia) [FSWW-2020-0008]
- Programa Estatal de Fomento de la Investigacion Cientfica y Tecnica de Excelencia Mara de Maeztu [MDM-2015-0509]
- Programa Severo Ochoa del Principado de Asturias
- Thalis program
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- EU-ESF
- Greek NSRF
- Rachadapisek Sompot Fund for Postdoctoral Fellowship, Chulalongkorn University
- Chulalongkorn Academic into Its 2nd Century Project Advancement Project (Thailand)
- Kavli Foundation
- Nvidia Corporation
- SuperMicro Corporation
- Welch Foundation [C-1845]
- Weston Havens Foundation (U.S.A.)
- NRC, Canada
- CERN
- CAS, China
- MOST, China
- SRNSFG, Georgia
- HGF, Germany
- NWO, Netherlands
- MES of Russia
- JINR
- DST/NRF, South Africa
- SRC, Sweden
- SNSF, Switzerland
- Cantons of Bern and Geneva, Switzerland
- Compute Canada, Canada
- Horizon 2020
- Marie Sklodowska-Curie Actions
- COST, European Union
- Herakleitos program
- Thales program
- EU-ESF, Greece
- Goran Gustafssons Stiftelse, Sweden
- BMBWF (Austria)
- CNPq (Brazil)
- CAS (China)
- MSES (Croatia)
- RPF (Cyprus)
- ERC IUT, (Estonia)
- PUT (Estonia)
- HIP (Finland)
- BMBF (Germany)
- DFG (Germany)
- IPM (Iran)
- MSIP (Republic of Korea)
- LAS (Lithuania)
- CINVESTAV (Mexico)
- LNS (Mexico)
- SEP (Mexico)
- MOS (Montenegro)
- NSC (Poland)
- MON (Russia)
- RAS (Russia)
- NRC KI (Russia)
- CPAN (Spain)
- PCTI (Spain)
- MST (Taipei)
- ThEPCenter (Thailand)
- IPST (Thailand)
- STAR (Thailand)
- STFC (United Kingdom)
- DOE (U.S.A.)
- STFC [ST/N001273/1, ST/K001639/1, ST/S000739/1, ST/L005603/1, ST/T000414/1, ST/M004775/1, ST/P002439/1] Funding Source: UKRI
- Science and Technology Facilities Council [ST/L005603/1, ST/K003542/1, ST/M004775/1, ST/N001273/1, ST/K001639/1] Funding Source: researchfish
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The combination of measurements of the W boson polarization in top quark decays performed by the ATLAS and CMS collaborations is presented. The measurements are based on proton-proton collision data produced at the LHC at a centre-of-mass energy of 8 TeV, and corresponding to an integrated luminosity of about 20 fb(-1)for each experiment. The measurements used events containing one lepton and having different jet multiplicities in the final state. The results are quoted as fractions of W bosons with longitudinal (F-0), left-handed (F-L), or right-handed (F-R) polarizations. The resulting combined measurements of the polarization fractions are F-0= 0.693 +/- 0.014 and F-L= 0.315 +/- 0.011. The fractionF(R)is calculated from the unitarity constraint to be F-R=-0.008 +/- 0.007. These results are in agreement with the standard model predictions at next-to-next-to-leading order in perturbative quantum chromodynamics and represent an improvement in precision of 25 (29)% for F-0(F-L) with respect to the most precise single measurement. A limit on anomalous right-handed vector (V-R), and left- and right-handed tensor (g(L), g(R)) tWb couplings is set while fixing all others to their standard model values. The allowed regions are [-0.11,0.16] for V-R, [-0.08,0.05] for g(L), and [-0.04,0.02] for g(R), at 95% confidence level. Limits on the corresponding Wilson coefficients are also derived.
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