LHCb Collaboration (Including: Back, J. J., Craik, Daniel, Dossett, D., Gershon, T. J., Harrison, P. F., Kreps, Michal, Latham, Thomas, Poluektov, Anton, Reid, Matthew M., Silva Coutinho, R., Whitehead, M. (Mark) and Williams, M. P.). (2012) Measurement of the isospin asymmetry in B → K (*)μ+μ- decays. Journal of High Energy Physics, Volume 7 . Article number 133. doi:10.1007/JHEP07(2012)133 ISSN 1029-8479.

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Abstract

The isospin asymmetries of B → K (*)μ +μ - decays and the partial branching fractions of Bº→ Kº μ+μ- and B +→ K *+μ +μ - are measured as a function of the di-muon mass squared q² using an integrated luminosity of 1.0fb -1 collected with the LHCb detector. The B → Kμ+μ- isospin asymmetry integrated over q² is negative, deviating from zero with over 4 σ significance. The B → K*μ+μ- decay measurements are consistent with the Standard Model prediction of negligible isospin asymmetry. The observation of the decay Bº → Kºs μ+μ- is reported with 5.7 σ significance. Assuming that the branching fraction of Bº → Kºμ+μ- is twice that of Bº → Kºs μ+μ-, the branching fractions of Bº → Kºμ+μ- and B → K*+μ+μ- are found to be (0.31 +0.07 -0.06) × 10 -6 and (1.16 ±0.19) × 10 -6, respectively.

Item Type:	Journal Article
Subjects:	Q Science > QA Mathematics Q Science > QC Physics
Divisions:	Faculty of Science, Engineering and Medicine > Science > Physics
Library of Congress Subject Headings (LCSH):	Mathematical physics, Isobaric spin, Nuclear physics
Journal or Publication Title:	Journal of High Energy Physics
Publisher:	Springer
ISSN:	1029-8479
Official Date:	July 2012
Dates:	Date Event July 2012 Published
Volume:	Volume 7
Page Range:	Article number 133
DOI:	10.1007/JHEP07(2012)133
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Restricted or Subscription Access
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)

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