LHCb Collaboration (Including: Back, J. J., Craik, Daniel, Dossett, D., Gershon, T. J., Harrison, P. F., Kreps, Michal, Latham, Thomas, Pilar, T., Poluektov, Anton, Reid, Matthew M., Silva Coutinho, R., Whitehead, M. (Mark) and Williams, M. P.). (2013) First observations of Bºs →D+D-, Ds+D- and DºDº decays. Physical Review D (Particles, Fields, Gravitation and Cosmology), Volume 87 (Number 9). Article number 092007 . doi:10.1103/PhysRevD.87.092007 ISSN 1550-7998.

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Abstract

First observations and measurements of the branching fractions of the Bˉºs →D+D-, Bˉºs →Ds+D- and Bˉºs→DºDˉº decays are presented using 1.0  fb-1 of data collected by the LHCb experiment. These branching fractions are normalized to those of Bˉºs →D+D, Bº→D-Ds+ and Bˉ→DºDˉs, respectively. An excess of events consistent with the decay Bˉº →DºDˉº is also seen, and its branching fraction is measured relative to that of Bˉ→DºDˉs. Improved measurements of the branching fractions B(Bˉºs→Ds+Ds-) and B(Bˉ→DºDs-) are reported, each relative to B(Bº→D-Ds+). The ratios of branching fractions are B(Bˉºs →D+D-) B(Bˉºs→DºDˉº)=1.08±0.20±0.10, B(Bˉºs →D+D-) B(Bº→D-Ds+)=0.050±0.008±0.004, B( Bˉºs→DºDˉº)/B(Bˉ→DºDˉs)=0.019±0.003±0.003, B( Bˉºs→DºDˉº)/B(Bˉ→DºDˉs)<0.0024 at 90% CL, B(Bˉºs →D+D-) B(Bº→D-Ds+)=0.56±0.03±0.04, B(Bˉ→DºDˉs)/B(Bº→D-Ds+)=1.22±0.02±0.07, where the uncertainties are statistical and systematic, respectively.

Item Type:	Journal Article
Subjects:	Q Science > QC Physics
Divisions:	Faculty of Science, Engineering and Medicine > Science > Physics
Library of Congress Subject Headings (LCSH):	Mathematical physics, Nuclear counters, B mesons, B mesons -- Decay
Journal or Publication Title:	Physical Review D (Particles, Fields, Gravitation and Cosmology)
Publisher:	American Physical Society
ISSN:	1550-7998
Official Date:	21 May 2013
Dates:	Date Event 21 May 2013 Published
Volume:	Volume 87
Number:	Number 9
Page Range:	Article number 092007
DOI:	10.1103/PhysRevD.87.092007
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Open Access (Creative Commons)
Date of first compliant deposit:	1 August 2016
Date of first compliant Open Access:	1 August 2016
Funder:	Brazil. Coordenação do Aperfeiçoamento de Pessoal de Nível Superior (CAPES), Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq), Fundação Carlos Chagas Filho de Amparo à Pesquisa do Estado do Rio de Janeiro (FAPERJ), Financiadora de Estudos e Projetos (Brazil) (FINEP), European Organization for Nuclear Research (CERN), Guo jia zi ran ke xue ji jin wei yuan hui (China) [National Natural Science Foundation of China] (NSFC), Centre national de la recherche scientifique (France) (CNRS), Institut national de physique nucléaire et de physique des particules (IN2P3), Germany. Bundesministerium für Bildung und Forschung (BMBF), Hermann von Helmholtz-Gemeinschaft Deutscher Forschungszentren (HGF), Max-Planck-Gesellschaft zur Förderung der Wissenschaften [Max Planck Society for the Advancement of Science], Science Foundation Ireland (SFI), Istituto nazionale di fisica nucleare (INFN), Stichting voor Fundamenteel Onderzoek der Materie (FOM) [Foundation for Fundamental Research on Matter], Nederlandse Organisatie voor Wetenschappelijk Onderzoek [Netherlands Organisation for Scientific Research] (NWO), SCSR (Poland), Autoritatea Nationala pentru Cercetare Stiintifica (ANCS), Federalʹnoe agentstvo po atomnoĭ ėnergii (Russia), Russia (Federation). Ministerstvo obrazovanii︠a︡ i nauki [Ministry of Education and Science], Spain. Ministerio de Ciencia e Innovación (MICINN), Galicia (Spain : Region). Xunta, Catalonia (Spain), Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung [Swiss National Science Foundation] (SNSF), Natsionalʹna akademiia nauk Ukraïny (NAS), Science and Technology Facilities Council (Great Britain) (STFC), National Science Foundation (U.S.) (NSF), European Research Council (ERC), Seventh Framework Programme (European Commission) (FP7), Auvergne (France), Deutsche Forschungsgemeinschaft (DFG), Rossiĭskiĭ fond fundamentalʹnykh issledovaniĭ [Russian Foundation for Basic Research] (RFBR), Rossiĭskiĭ nauchnyĭ t︠s︡entr "Kurchatovskiĭ institut" [Russian Research Center "Kurchatov Institute"] (Russia), Spain. Ministerio de Economía y Competitividad [Ministry of Economy and Competitiveness] (MINECO), Switzerland. Staatssekretariat für Ausbildung und Forschung (SER)

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