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Observation of B-s0-Bs0 mixing and measurement of mixing frequencies using semileptonic B decays

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LHCb Collaboration (Including: Back, J. J., Craik, Daniel, Dossett, D., Gershon, T. J., Kreps, Michal, Latham, Thomas, Pilar, T., Poluektov, Anton, Reid, Matthew M., Silva Coutinho, R., Wallace, Charlotte, Whitehead, M. (Mark) and Williams, M. P.). (2013) Observation of B-s0-Bs0 mixing and measurement of mixing frequencies using semileptonic B decays. European Physical Journal C, Volume 73 (Number 12). Article number 2655. doi:10.1140/epjc/s10052-013-2655-8 ISSN 1434-6044.

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Official URL: http://dx.doi.org/10.1140/epjc/s10052-013-2655-8

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Abstract

The B0
s
and B0 mixing frequencies, [triangle]ms and
[triangle]md, are measured using a data sample corresponding to an
integrated luminosity of 1.0 fb−1 collected by the LHCb experiment
in pp collisions at a centre of mass energy of 7 TeV
during 2011. Around
1.8×106 candidate events are selected
of the type B0
(s)
→ D−
(s)
μ+ (+ anything), where about half
are from peaking and combinatorial backgrounds. To determine
the B decay times, a correction is required for the
momentum carried by missing particles, which is performed
using a simulation-based statistical method. Associated production
of muons or mesons allows us to tag the initialstate
flavour and so to resolve oscillations due to mixing.
We obtain
[triangle]ms
=
.
17.93
±
0.22(stat)
±
0.15(syst)
.
ps−1 ,
[triangle]md
=
.
0.503
±
0.011(stat)
±
0.013(syst)
.
ps−1 .
The hypothesis of no oscillations is rejected by the equivalent
of 5.8 standard deviations for B0
s
and 13.0 standard deviations
for B0 . This is the first observation of B0
s
mixing to
be made using only semileptonic decays.

Item Type: Journal Article
Subjects: Q Science > QC Physics
Divisions: Faculty of Science, Engineering and Medicine > Science > Physics
Library of Congress Subject Headings (LCSH): Beta decay, Nuclear counters, B mesons
Journal or Publication Title: European Physical Journal C
Publisher: Springer
ISSN: 1434-6044
Official Date: 2013
Dates:
DateEvent
2013Published
Volume: Volume 73
Number: Number 12
Page Range: Article number 2655
DOI: 10.1140/epjc/s10052-013-2655-8
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Open Access (Creative Commons)
Date of first compliant deposit: 10 December 2017
Date of first compliant Open Access: 10 December 2017
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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