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Precision measurement of the mass and lifetime of the Ξb0 baryon

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LHCb Collaboration (Including: Back, J. J., Blake, Thomas, Craik, Daniel, Dossett, D., Gershon, T. J., Kreps, Michal, Latham, Thomas, O'Hanlon, D. P., Pilar, T., Poluektov, Anton, Reid, Matthew M., Silva Coutinho, R., Wallace, Charlotte and Whitehead, M. (Mark)). (2014) Precision measurement of the mass and lifetime of the Ξb0 baryon. Physical Review Letters, Volume 113 (Number 3). Article number 032001. doi:10.1103/PhysRevLett.113.032001

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Official URL: http://dx.doi.org/10.1103/PhysRevLett.113.032001

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Abstract

Using a proton-proton collision data sample corresponding to an integrated luminosity of 3fb-1 collected by LHCb at center-of-mass energies of 7 and 8 TeV, about 3800 Ξb0→Ξc+π-, Ξc+→pK-π+ signal decays are reconstructed. From this sample, the first measurement of the Ξb0 baryon lifetime is made, relative to that of the Λb0 baryon. The mass differences M(Ξb0)-M(Λb0) and M(Ξc+)-M(Λc+) are also measured with precision more than 4 times better than the current world averages. The resulting values are τΞb0τΛb0=1.006±0. 018±0.010,M(Ξb0)-M(Λb0)=172.44±0.39±0.17MeV/c2, M(Ξc+)-M(Λc+)=181.51±0.14±0.10MeV/c2,where the first uncertainty is statistical and the second is systematic. The relative rate of Ξb0 to Λb0 baryon production is measured to be fΞb0fΛ b0B(Ξb0→Ξc+π-)B(Λb0→Λc+π-) B(Ξc+→pK-π+)B(Λc+→pK-π+)=(1.88±0.04±0. 03)×10-2,where the first factor is the ratio of fragmentation fractions, b→Ξb0 relative to b→Λb0. Relative production rates as functions of transverse momentum and pseudorapidity are also presented.

Item Type: Journal Article
Subjects: Q Science > QC Physics
Divisions: Faculty of Science > Physics
Library of Congress Subject Headings (LCSH): Baryons -- Decay
Journal or Publication Title: Physical Review Letters
Publisher: American Physical Society
ISSN: 0031-9007
Official Date: 15 July 2014
Dates:
DateEvent
15 July 2014Published
28 May 2014Submitted
Date of first compliant deposit: 27 December 2015
Volume: Volume 113
Number: Number 3
Article Number: Article number 032001
DOI: 10.1103/PhysRevLett.113.032001
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Open Access
Funder: European Organization for Nuclear Research (CERN), 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), 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), Auvergne (France), 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], 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), Institutul de Fizică Atomică (IFA), Federalʹnoe agentstvo po atomnoĭ ėnergii (Russia), 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), Galicia (Spain : Region). Xunta, Catalonia (Spain), Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung [Swiss National Science Foundation] (SNSF), Switzerland. Staatssekretariat für Ausbildung und Forschung (SER), Nat︠s︡ionalʹna akademii︠a︡ nauk Ukraïny (NAS), Science and Technology Facilities Council (Great Britain) (STFC), Royal Society (Great Britain), National Science Foundation (U.S.) (NSF), European Particle physics Latin American NETwork (EPLANET), Seventh Framework Programme (European Commission) (FP7)

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