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Measurements of direct CP asymmetries in B→Xsγ decays using sum of exclusive decays

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BABAR Collaboration (Including: Harrison, Paul F., Gershon, T. J. and Latham, Thomas). (2014) Measurements of direct CP asymmetries in B→Xsγ decays using sum of exclusive decays. Physical Review D (Particles, Fields, Gravitation and Cosmology), Volume 90 (Number 9). Article number 092001 . doi:10.1103/PhysRevD.90.092001 ISSN 1550-7998.

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Official URL: http://dx.doi.org/10.1103/PhysRevD.90.092001

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Abstract

We measure the direct CP violation asymmetry, ACP, in B→Xsγ and the isospin difference of the asymmetry, ΔACP, using 429  fb−1 of data collected at Υ(4S) resonance with the BABAR detector at the PEP-II asymmetric-energy e+e− storage rings operating at the SLAC National Accelerator Laboratory. B mesons are reconstructed from ten charged B final states and six neutral B final states. We find ACP=+(1.7±1.9±1.0)%, which is in agreement with the Standard Model prediction and provides an improvement on the world average. Moreover, we report the first measurement of the difference between ACP for charged and neutral decay modes, ΔACP=+(5.0±3.9±1.5)%. Using the value of ΔACP, we also provide 68% and 90% confidence intervals on the imaginary part of the ratio of the Wilson coefficients corresponding to the chromomagnetic dipole and the electromagnetic dipole transitions.

Item Type: Journal Article
Subjects: Q Science > QC Physics
Divisions: Faculty of Science, Engineering and Medicine > Science > Physics
Library of Congress Subject Headings (LCSH): Particles (Nuclear physics) -- Flavor, Branching fractions (Nuclear physics)
Journal or Publication Title: Physical Review D (Particles, Fields, Gravitation and Cosmology)
Publisher: American Physical Society
ISSN: 1550-7998
Official Date: 5 October 2014
Dates:
DateEvent
5 October 2014Published
4 June 2014Submitted
Volume: Volume 90
Number: Number 9
Article Number: Article number 092001
DOI: 10.1103/PhysRevD.90.092001
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Restricted or Subscription 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), 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), Poland. Ministerstwo Nauki i Szkolnictwa Wyższego [Ministry of Science and Higher Education] (MNiSW), Narodowe Centrum Nauki (NCN), Institutul de Fizică Atomică (IFA), Federal Agency of Scientific Organizations, Spain. Ministerio de Economía y Competitividad [Ministry of Economy and Competitiveness] (MINECO), 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), National Science Foundation (U.S.) (NSF), European Particle physics Latin American NETwork (EPLANET), European Research Council (ERC), Auvergne (France), Rossiĭskiĭ fond fundamentalʹnykh issledovaniĭ [Russian Foundation for Basic Research] (RFBR), Galicia (Spain : Region). Xunta, Catalonia (Spain), Royal Society (Great Britain), Great Britain. Royal Commission for the Exhibition of 1851

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