A search for rare B → Dμ+μ decays

The LHCb Collaboration

Research output: Contribution to JournalArticleAcademicpeer-review

Abstract

A search for rare B → Dμ+μ decays is performed using proton-proton collision data collected by the LHCb experiment, corresponding to an integrated luminosity of 9 fb−1. No significant signals are observed in the non-resonant μ+μ modes, and upper limits of BB0→D¯0μ+μ<5.1×10−8, BB+→Ds+μ+μ<3.2×10−8, BBs0→D¯0μ+μ<1.6×10−7 and fc/fu·BBc+→Ds+μ+μ<9.6×10−8 are set at the 95 % confidence level, where fc and fu are the fragmentation fractions of a B meson with a c and u quark respectively in proton-proton collisions. Each result is either the first such measurement or an improvement by three orders of magnitude on an existing limit. Separate upper limits are calculated when the muon pair originates from a J/ψ → μ+μ decay. The branching fraction of Bc+→Ds+J/ψ multiplied by the fragmentation-fraction ratio is measured to be (Formula presented.) where the first uncertainty is statistical and the second systematic.

Original languageEnglish
Article number32
Pages (from-to)1-23
Number of pages23
JournalJournal of High Energy Physics
Volume2024
Issue number2
Early online date7 Feb 2024
DOIs
Publication statusPublished - Feb 2024

Bibliographical note

Publisher Copyright:
© The Author(s) 2024.

Funding

We express our gratitude to our colleagues in the CERN accelerator departments for the excellent performance of the LHC. We thank the technical and administrative staff at the LHCb institutes. We acknowledge support from CERN and from the national agencies: CAPES, CNPq, FAPERJ and FINEP (Brazil); MOST and NSFC (China); CNRS/IN2P3 (France); BMBF, DFG and MPG (Germany); INFN (Italy); NWO (Netherlands); MNiSW and NCN (Poland); MCID/IFA (Romania); MICINN (Spain); SNSF and SER (Switzerland); NASU (Ukraine); STFC (United Kingdom); DOE NP and NSF (U.S.A.). We acknowledge the computing resources that are provided by CERN, IN2P3 (France), KIT and DESY (Germany), INFN (Italy), SURF (Netherlands), PIC (Spain), GridPP (United Kingdom), CSCS (Switzerland), IFIN-HH (Romania), CBPF (Brazil), Polish WLCG (Poland) and NERSC (U.S.A.). We are indebted to the communities behind the multiple open-source software packages on which we depend. Individual groups or members have received support from ARC and ARDC (Australia); Minciencias (Colombia); AvH Foundation (Germany); EPLANET, Marie Sk\u0142odowska-Curie Actions and ERC (European Union); A*MIDEX, ANR, IPhU and Labex P2IO, and R\u00E9gion Auvergne-Rh\u00F4ne-Alpes (France); Key Research Program of Frontier Sciences of CAS, CAS PIFI, CAS CCEPP, Fundamental Research Funds for the Central Universities, and Sci. & Tech. Program of Guangzhou (China); GVA, XuntaGal, GENCAT and Prog. Atracci\u00F3n Talento, CM (Spain); SRC (Sweden); the Leverhulme Trust, the Royal Society and UKRI (United Kingdom).

FundersFunder number
Institutul National de Cercetare-Dezvoltare pentru Fizica si Inginerie Nucleara 'Horia Hulubei'
Agence Nationale de la Recherche
Australian Research Council
Australian Research Data Commons
Stockholm Resilience Centre, Stockholm University
National Academy of Sciences of Ukraine
Narodowe Centrum Nauki
GENCAT
National Science Foundation
Institut national de physique nucléaire et de physique des particules
Science and Technology Facilities Council
H2020 Marie Skłodowska-Curie Actions
Automotive Research Center
Fundação Carlos Chagas Filho de Amparo à Pesquisa do Estado do Rio de Janeiro
Nederlandse Organisatie voor Wetenschappelijk Onderzoek
Ministerio de Ciencia e Innovación
Ministry of Science and Technology, Taiwan
Program of Guangzhou
Leverhulme Trust
SURF
Instituto Nazionale di Fisica Nucleare
National Energy Research Scientific Computing Center
Financiadora de Estudos e Projetos
Centre National de la Recherche Scientifique
Bundesministerium für Bildung und Forschung
Conselho Nacional de Desenvolvimento Científico e Tecnológico
Coordenação de Aperfeiçoamento de Pessoal de Nível Superior
Karlsruhe Institute of Technology
Deutsche Forschungsgemeinschaft
Région Auvergne-Rhône-Alpes
U.S. Department of Energy
CAS CCEPP
GridPP
Deutsches Elektronen-Synchrotron
Chinese Academy of Sciences
Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung
Key Research Program of Frontier Sciences of CAS
Royal Society
Sociedad Española de Reumatología
European Research Council
EPLANET
Ministerstwo Edukacji i Nauki
Generalitat Valenciana
CERN
Fundamental Research Funds for the Central Universities
Alexander von Humboldt-Stiftung
UK Research and Innovation
National Natural Science Foundation of China

    Keywords

    • B Physics
    • Flavour Physics
    • Hadron-Hadron Scattering
    • Rare Decay

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