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Measurement of the production of a W boson in association with a charm quark in pp collisions at s√ = 7 TeV with the ATLAS detector

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ATLAS Collaboration (Including: Farrington, Sinead, Harrison, P. F., Janus, M., Jeske, C., Jones, G. (Graham), Martin, T. A., Murray, W. and Pianori, E.). (2014) Measurement of the production of a W boson in association with a charm quark in pp collisions at s√ = 7 TeV with the ATLAS detector. Journal of High Energy Physics, Volume 2014 (Number 5). Article number 68. doi:10.1007/JHEP05(2014)068 ISSN 1029-8479.

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Official URL: http://dx.doi.org/10.1007/JHEP05(2014)068

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Abstract

The production of a W boson in association with a single charm quark is studied using 4.6 fb−1 of pp collision data at s√ = 7 TeV collected with the ATLAS detector at the Large Hadron Collider. In events in which a W boson decays to an electron or muon, the charm quark is tagged either by its semileptonic decay to a muon or by the presence of a charmed meson. The integrated and differential cross sections as a function of the pseudorapidity of the lepton from the W-boson decay are measured. Results are compared to the predictions of next-to-leading-order QCD calculations obtained from various parton distribution function parameterisations. The ratio of the strange-to-down sea-quark distributions is determined to be 0.96+0.26−0.30 at Q 2 = 1.9 GeV2, which supports the hypothesis of an SU(3)-symmetric composition of the light-quark sea. Additionally, the cross-section ratio σ(W + + c¯)/σ(W − + c) is compared to the predictions obtained using parton distribution function parameterisations with different assumptions about the s−s¯ quark asymmetry.

Item Type: Journal Article
Subjects: Q Science > QC Physics
Divisions: Faculty of Science, Engineering and Medicine > Science > Physics
Library of Congress Subject Headings (LCSH): Large Hadron Collider (France and Switzerland), Particles (Nuclear physics) -- Charm
Journal or Publication Title: Journal of High Energy Physics
Publisher: Springer
ISSN: 1029-8479
Official Date: 16 May 2014
Dates:
DateEvent
16 May 2014Published
15 April 2014Accepted
1 April 2014Submitted
Volume: Volume 2014
Number: Number 5
Number of Pages: 65
Article Number: Article number 68
DOI: 10.1007/JHEP05(2014)068
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Open Access (Creative Commons)
Date of first compliant deposit: 28 July 2016
Date of first compliant Open Access: 28 July 2016
Funder: European Organization for Nuclear Research (CERN), Agencia Nacional de Promoción Científica y Tecnológica (Argentina), Yerevan Physics Institute (Armenia), Australian Research Council (ARC), Austria. Bundesministerium für Wissenschaft und Forschung [Federal Ministry of Education, Science and Culture], Fonds zur Förderung der Wissenschaftlichen Forschung (Austria) (FWF), Azärbaycan Milli Elmlär Akademiyası, Belarus.‏ ‎Gosudarstvennyĭ komitet po nauke i tekhnologii︠a︡m‏, Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq), Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP), Natural Sciences and Engineering Research Council of Canada (NSERC), National Research Council Canada (NRCC), Canada Foundation for Innovation (CFI), Chile. Comisión Nacional de Investigación Científica y Tecnológica (CONICYT), Zhongguo ke xue yuan [Chinese Academy of Sciences] (CAS), Guo jia zi ran ke xue ji jin wei yuan hui (China) [National Natural Science Foundation of China] (NSFC), China. Guo jia ke xue ji shu bu [Ministry of Science and Technology], Fondo Colombiano de Investigaciones Científicas y Proyectos Especiales Francisco José de Caldas (COLCIENCIAS), VSC CR (Czech Republic), Czech Republic. Ministerstvo školství, mládeže a tělovýchovy [Ministry of Education, Youth, and Sport], Czech Republic.‏ ‎Ministerstvo průmyslu a obchodu‏ [Ministery of Industry and Trade] (MPO), Lundbeck Foundation, Danmarks Grundforskningsfond [Danish National Research Foundation], Statens naturvidenskabelige forskningsråd (Denmark) [Natural Science Research Council], European Particle physics Latin American NETwork (EPLANET), European Research Council (ERC), Institut national de physique nucléaire et de physique des particules (IN2P3), Centre national de la recherche scientifique (France) (CNRS), France. Commissariat à l'énergie atomique (CEA), Sakʻartʻvelos mecʻnierebatʻa erovnuli akademia [Georgian National Academy of Sciences] (GNAS), Germany. Bundesministerium für Bildung und Forschung (BMBF), Deutsche Forschungsgemeinschaft (DFG), Hermann von Helmholtz-Gemeinschaft Deutscher Forschungszentren (HGF), Max-Planck-Gesellschaft zur Förderung der Wissenschaften [Max Planck Society for the Advancement of Science], Alexander von Humboldt-Stiftung (AvHS), Greece. General Secretariat of Research and Technology, Israel Science Foundation (ISF), Minerva Stiftung, German-Israeli Foundation for Scientific Research and Development, Israeli Centers of Research Excellence (I-CORE), Benoziyo Center (Israel), Istituto nazionale di fisica nucleare (INFN), Japan. Monbu Kagakushō [Japan. Ministry of Education, Culture, Sports, Science and Technology] (MK), Nihon Gakujutsu Shinkōkai [Japan Society for the Promotion of Science] (NGS), Centre national pour la recherche scientifique et technique (Morocco), Stichting voor Fundamenteel Onderzoek der Materie (FOM) [Foundation for Fundamental Research on Matter], Nederlandse Organisatie voor Wetenschappelijk Onderzoek [Netherlands Organisation for Scientific Research] (NWO), Norges forskningsråd [Norwegian Research Council], BRF (Norway), Poland. Ministerstwo Nauki i Szkolnictwa Wyższego [Ministry of Science and Higher Education] (MNiSW), Narodowe Centrum Nauki (NCN), Portugal.‏ Ministério da Ciência, da Inovação e do Ensino Superior, Fundação para a Ciência e a Tecnologia (FCT), Romania.‏ Ministerul Educației Naționale‏ (MNE), Institutul de Fizică Atomică (IFA), Russia (Federation). Ministerstvo obrazovanii︠a︡ [Ministry of Education], Federalʹnoe agentstvo po atomnoĭ ėnergii (Russia), Serbia. Joint Institute for Nuclear Research (JINR), Serbia. Ministarstvo prosvete i sporta‏ [Ministry of Education] (MSTD), Slovenia. Ministerstvo Spravodlivosti Slovenskej Republiky, Slovenian Research Agency, Slovenia.‏ Ministrstvo za šolstvo, znanost in šport‏, South Africa. Department of Science and Technology, National Research Foundation (South Africa) (NRF), Spain. Ministerio de Economía y Competitividad [Ministry of Economy and Competitiveness] (MINECO), Sweden. Vetenskapsrådet [Research Council], Knut och Alice Wallenbergs Stiftelse (Sweden), Switzerland. Staatssekretariat für Ausbildung und Forschung (SER), Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung [Swiss National Science Foundation] (SNSF), Bern (Switzerland : Canton), Türkiye Atom Enerjisi Kurumu (TAEK), Geneva (Switzerland : Canton), China. Guo jia ke xue ji shu bu [Ministry of Science and Technology], National Strategic Research Framework (Greece), Science and Technology Facilities Council (Great Britain) (STFC), Royal Society (Great Britain), Leverhulme Trust (LT), United States. Department of Energy, National Science Foundation (U.S.) (NSF)

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