Combination of the W boson polarization measurements in top quark decays using ATLAS and CMS data at s√ = 8 TeV
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Springer Nature
Materia
Hadron-Hadron scattering (experiments) Top physics
Fecha
2020-08-12Referencia bibliográfica
Aad, G., Abbott, B., Abbott, D.C. et al. Combination of the W boson polarization measurements in top quark decays using ATLAS and CMS data at s√ = 8 TeV. J. High Energ. Phys. 2020, 51 (2020). [https://doi.org/10.1007/JHEP08(2020)051]
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ANPCyT; YerPhI, Armenia; Australian Research Council; BMWFW, Austria; Austrian Science Fund (FWF); Azerbaijan National Academy of Sciences (ANAS); SSTC, Belarus; National Council for Scientific and Technological Development (CNPq); Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP); Natural Sciences and Engineering Research Council of Canada; Canada Foundation for Innovation; Comision Nacional de Investigacion Cientifica y Tecnologica (CONICYT); National Natural Science Foundation of China (NSFC); Departamento Administrativo de Ciencia, Tecnologia e Innovacion Colciencias; DNRF, Denmark; Danish Natural Science Research Council; IN2P3-CNRS, CEA-DRF/IRFU, France; Federal Ministry of Education & Research (BMBF); Max Planck Society; Greek Ministry of Development-GSRT; Hong Kong Research Grants Council; Israel Science Foundation; Benoziyo Center, Israel; Istituto Nazionale di Fisica Nucleare (INFN); Ministry of Education, Culture, Sports, Science and Technology, Japan (MEXT) Japan Society for the Promotion of Science; CNRST, Morocco; RCN, Norway; Ministry of Science and Higher Education, Poland; NCN, Poland; Portuguese Foundation for Science and Technology; MNE/IFA, Romania; NRC KI, Russian Federation; MESTD, Serbia; MSSR, Slovakia; Slovenian Research Agency - Slovenia; MIZS, Slovenia; MINECO, Spain; Wallenberg Foundation, Sweden; SERI, Switzerland; Ministry of Science and Technology, Taiwan; Ministry of Energy & Natural Resources - Turkey; Science & Technology Facilities Council (STFC); United States Department of Energy (DOE); National Science Foundation (NSF); BCKDF, Canada; CANARIE, Canada; CRC, Canada; European Research Council (ERC); European Union (EU); French National Research Agency (ANR); German Research Foundation (DFG); Alexander von Humboldt Foundation; Greek NSRF, Greece; BSF-NSF, Israel; German-Israeli Foundation for Scientific Research and Development; CERCA Programme Generalitat de Catalunya, Spain; PROMETEO Programme Generalitat Valenciana, Spain; Royal Society of London; Leverhulme Trust; Fonds de la Recherche Scientifique - FNRS; FWO; CAPES; Carlos Chagas Filho Foundation for Research Support of the State of Rio de Janeiro (FAPERJ); Foundation for Research Support of the State of Rio Grande do Sul (FAPERGS); Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP); MES (Bulgaria); Ministry of Science and Technology, China; CSF (Croatia); SENESCYT (Ecuador); MoER, (Estonia); Academy of Finland; Spanish Government; French Atomic Energy Commission; Centre National de la Recherche Scientifique (CNRS); HGF (Germany); Greek Ministry of Development-GSRT; NKFIA (Hungary); Department of Atomic Energy (DAE); Department of Science & Technology (India); Science Foundation Ireland; Istituto Nazionale di Fisica Nucleare (INFN); NRF (Republic of Korea); MES (Latvia); MOE (Malaysia); UM (Malaysia); BUAP (Mexico); Consejo Nacional de Ciencia y Tecnologia (CONACyT); UASLP-FAI (Mexico); MBIE (New Zealand); PAEC (Pakistan); MSHE (Poland); Portuguese Foundation for Science and Technology; JINR (Dubna); RosAtom (Russia); Russian Foundation for Basic Research (RFBR); MESTD (Serbia); SEIDI (Spain); MOSTR (Sri Lanka); Swiss Funding Agencies (Switzerland); NSTDA (Thailand); Turkiye Bilimsel ve Teknolojik Arastirma Kurumu (TUBITAK); Ministry of Energy & Natural Resources - Turkey; NASU (Ukraine); Horizon 2020 Grant: 675440; 752730; 765710; Leventis Foundation; Alfred P. Sloan Foundation; Alexander von Humboldt Foundation; Belgian Federal Science Policy Office; Fonds de la Recherche Scientifique - FNRS; Institute for the Promotion of Innovation by Science and Technology in Flanders (IWT); FWO 30820817; Beijing Municipal Science & Technology Commission Z191100007219010; Ministry of Education, Youth & Sports - Czech Republic; German Research Foundation (DFG) EXC 2121 390833306; Lendulet ("Momentum") Programme; Hungarian Academy of Sciences; New National Excellence Program UNKP; NKFIA (Hungary) 123842 123959 124845 124850 125105 128713 128786 129058; Council of Scientific & Industrial Research (CSIR) - 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; Aristeia program; Greek Ministry of Development-GSRT; Rachadapisek Sompot Fund for Postdoctoral Fellowship, Chulalongkorn University; Chulalongkorn Academic into Its 2nd Century Project Advancement Project (Thailand); Kavli Foundation; Nvidia Corporation; SuperMicro Corporation; The Welch Foundation C-1845; Weston Havens Foundation (U.S.A.); NRC, Canada; CERN; Chinese Academy of Sciences; Ministry of Science and Technology, China; SRNSFG, Georgia; HGF, Germany; Netherlands Organization for Scientific Research (NWO); Netherlands Government; MES of Russia; JINR; DST/NRF, South Africa; SRC, Sweden; Swiss National Science Foundation (SNSF); Cantons of Bern and Geneva, Switzerland; Compute Canada, Canada; Marie Sklodowska-Curie Actions; COST, European Union; Herakleitos program; Thales program; EU-ESF, Greece; Goran Gustafssons Stiftelse, Sweden; BMBWF (Austria); National Council for Scientific and Technological Development (CNPq); Chinese Academy of Sciences; MSES (Croatia); RPF (Cyprus); Estonian Research Council; PUT (Estonia); HIP (Finland); Federal Ministry of Education & Research (BMBF); German Research Foundation (DFG); IPM (Iran); MSIP (Republic of Korea); LAS (Lithuania); CINVESTAV (Mexico); LNS (Mexico); SEP (Mexico); MOS (Montenegro); NSC (Poland); MON (Russia); NRC KI (Russia); CPAN (Spain); PCTI (Spain); MST (Taipei); ThEPCenter (Thailand); IPST (Thailand); STAR (Thailand)Resumen
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 (F0), left-handed (FL), or right-handed (FR) polarizations. The resulting combined measurements of the polarization fractions are F0 = 0.693 ± 0.014 and FL = 0.315 ± 0.011. The fraction FR is calculated from the unitarity constraint to be FR = −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 F0 (FL) with respect to the most precise single measurement. A limit on anomalous right-handed vector (VR), and left- and right-handed tensor (gL, gR) tWb couplings is set while fixing all others to their standard model values. The allowed regions are [−0.11, 0.16] for VR, [−0.08, 0.05] for gL, and [−0.04, 0.02] for gR, at 95% confidence level. Limits on the corresponding Wilson coefficients are also derived. Russian Academy of Sciences