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Observation of the rare Bs0 →µ+µ− decay from the combined analysis of CMS and LHCb data

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CMS collaborations, LHCb collaborations (Including: Sahoo, Niladri, Swain, S. K., Back, J. J., Blake, T., Craik, Daniel, Crocombe, Andrew, Dossett, D., Gershon, T. J., Kreps, Michal, Langenbruch, Christoph, Latham, Thomas, O’Hanlon, Daniel, Pilar, T., Poluektov, Anton, Reid, Matthew M., Silva Coutinho, R., Wallace, Charlotte and Whitehead, M. (Mark)). (2015) Observation of the rare Bs0 →µ+µ− decay from the combined analysis of CMS and LHCb data. Nature, 522 (7554). pp. 68-72. doi:10.1038/nature14474 ISSN 0028-0836.

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Official URL: http://dx.doi.org/10.1038/nature14474

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Abstract

The standard model of particle physics describes the fundamental particles and their interactions via the strong, electromagnetic and weak forces. It provides precise predictions for measurable quantities that can be tested experimentally. The probabilities, or branching fractions, of the strange B meson () and the B0 meson decaying into two oppositely charged muons (μ+ and μ−) are especially interesting because of their sensitivity to theories that extend the standard model. The standard model predicts that the and decays are very rare, with about four of the former occurring for every billion mesons produced, and one of the latter occurring for every ten billion B0 mesons1. A difference in the observed branching fractions with respect to the predictions of the standard model would provide a direction in which the standard model should be extended. Before the Large Hadron Collider (LHC) at CERN2 started operating, no evidence for either decay mode had been found. Upper limits on the branching fractions were an order of magnitude above the standard model predictions. The CMS (Compact Muon Solenoid) and LHCb (Large Hadron Collider beauty) collaborations have performed a joint analysis of the data from proton–proton collisions that they collected in 2011 at a centre-of-mass energy of seven teraelectronvolts and in 2012 at eight teraelectronvolts. Here we report the first observation of the µ+µ− decay, with a statistical significance exceeding six standard deviations, and the best measurement so far of its branching fraction. Furthermore, we obtained evidence for the µ+µ− decay with a statistical significance of three standard deviations. Both measurements are statistically compatible with standard model predictions and allow stringent constraints to be placed on theories beyond the standard model. The LHC experiments will resume taking data in 2015, recording proton–proton collisions at a centre-of-mass energy of 13 teraelectronvolts, which will approximately double the production rates of and B0 mesons and lead to further improvements in the precision of these crucial tests of the standard model.

Item Type: Journal Article
Subjects: Q Science > QC Physics
Divisions: Faculty of Science, Engineering and Medicine > Science > Physics
Library of Congress Subject Headings (LCSH): B mesons -- Decay, Particles (Nuclear physics)
Journal or Publication Title: Nature
Publisher: Nature Publishing
ISSN: 0028-0836
Official Date: 13 May 2015
Dates:
DateEvent
13 May 2015Published
31 March 2015Accepted
Volume: 522
Number: 7554
Page Range: pp. 68-72
DOI: 10.1038/nature14474
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Open Access (Creative Commons)
Date of first compliant deposit: 26 February 2020
Date of first compliant Open Access: 27 February 2020
RIOXX Funder/Project Grant:
Project/Grant IDRIOXX Funder NameFunder ID
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UNSPECIFIED[NSFC] National Natural Science Foundation of Chinahttp://dx.doi.org/10.13039/501100001809
UNSPECIFIEDInstitut National des Sciences de l'Univers, Centre National de la Recherche Scientifiquehttp://dx.doi.org/10.13039/501100004617
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UNSPECIFIEDHelmholtz-Gemeinschafthttp://dx.doi.org/10.13039/501100001656
UNSPECIFIEDScience Foundation Irelandhttp://dx.doi.org/10.13039/501100001602
UNSPECIFIED[INFN] Instituto Nazionale di Fisica Nuclearehttp://dx.doi.org/10.13039/501100004007
UNSPECIFIEDNational Academy of Sciences of Ukrainehttp://dx.doi.org/10.13039/501100004742
UNSPECIFIED[STFC] Science and Technology Facilities Councilhttp://dx.doi.org/10.13039/501100000271
UNSPECIFIEDNational Science Foundationhttp://dx.doi.org/10.13039/501100008982
UNSPECIFIEDAustria. Bundesministerium für Wissenschaft, Forschung und Wirtschafthttp://viaf.org/viaf/317120994
UNSPECIFIEDAustrian Science Fundhttp://dx.doi.org/10.13039/501100002428
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UNSPECIFIEDChinese Academy of SciencesUNSPECIFIED
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UNSPECIFIEDHaridus- ja Teadusministeeriumhttp://dx.doi.org/10.13039/501100003510
UNSPECIFIEDEuropean Research Councilhttp://dx.doi.org/10.13039/501100000781
UNSPECIFIED[ERDF] European Regional Development Fundhttp://dx.doi.org/10.13039/501100008530
UNSPECIFIEDAcademy of Finlandhttp://dx.doi.org/10.13039/501100002341
UNSPECIFIEDFysiikan tutkimuslaitoshttp://viaf.org/viaf/161300169
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UNSPECIFIEDGeneral Secretariat for Research and Technologyhttp://dx.doi.org/10.13039/501100003448
UNSPECIFIEDHungarian Scientific Research Fundhttp://dx.doi.org/10.13039/501100003549
UNSPECIFIEDDepartment of Atomic Energy, Government of Indiahttp://dx.doi.org/10.13039/501100001502
UNSPECIFIEDIndia. Department of Science and Technologyhttp://viaf.org/viaf/139476328
UNSPECIFIEDConsejo Nacional de Ciencia y TecnologíaUNSPECIFIED
UNSPECIFIEDSecretaría de Educación PúblicaUNSPECIFIED
UNSPECIFIEDUniversidad Autónoma de San Luis PotosíUNSPECIFIED
UNSPECIFIEDMinistry of Business, Innovation and Employmenthttp://dx.doi.org/10.13039/501100003524
UNSPECIFIEDPakistan Atomic Energy Commissionhttp://dx.doi.org/10.13039/501100008689
UNSPECIFIEDMinisterstwo Nauki i Szkolnictwa WyższegoUNSPECIFIED
UNSPECIFIEDNarodowe Centrum Naukihttp://dx.doi.org/10.13039/501100004281
UNSPECIFIEDFundação para a Ciência e a TecnologiaUNSPECIFIED
UNSPECIFIEDJoint Institute for Nuclear Researchhttp://dx.doi.org/10.13039/501100003822
UNSPECIFIEDVserossiĭskiĭ institut nauchnoĭ i tekhnicheskoĭ informat︠s︡iihttp://viaf.org/viaf/162648501
UNSPECIFIEDState Atomic Energy Corporation ROSATOMhttp://dx.doi.org/10.13039/501100008687
UNSPECIFIEDRussian Academy of Scienceshttp://dx.doi.org/10.13039/501100002674
UNSPECIFIEDРоссийский Фонд Фундаментальных Исследований (РФФИ)UNSPECIFIED
UNSPECIFIEDMinistarstvo Prosvete, Nauke i Tehnološkog RazvojaUNSPECIFIED
UNSPECIFIEDSecretaría de Estado de Investigación, Desarrollo e InnovaciónUNSPECIFIED
UNSPECIFIEDCentro Nacional de Física de Partículas, Astropartículas y NuclearUNSPECIFIED
UNSPECIFIEDSwiss Funding Agencies UNSPECIFIED
UNSPECIFIEDMinistry of Science and Technology, Taiwanhttp://dx.doi.org/10.13039/501100004663
UNSPECIFIEDThailand Center of Excellence in Physicshttp://dx.doi.org/10.13039/100012863
UNSPECIFIEDSathāban Songsœ̄m Kānsō̜n Witthayāsāt læ Thēknōlōyī (Thailand)http://viaf.org/viaf/154858089
UNSPECIFIEDNational Science and Technology Development Agencyhttp://dx.doi.org/10.13039/501100004192
UNSPECIFIEDTürkiye Bilimsel ve Teknolojik Araştirma KurumuUNSPECIFIED
UNSPECIFIEDTürkiye Atom Enerjisi KurumuUNSPECIFIED
UNSPECIFIEDState Fund for Fundamental Research of Ukrainehttp://dx.doi.org/10.13039/501100008690
UNSPECIFIED[DOE] U.S. Department of Energyhttp://dx.doi.org/10.13039/100000015
UNSPECIFIEDFinanciadora de Estudos e Projetoshttp://dx.doi.org/10.13039/501100004809
UNSPECIFIEDMax-Planck-Gesellschafthttp://dx.doi.org/10.13039/501100004189
UNSPECIFIEDStichting voor Fundamenteel Onderzoek der Materiehttp://dx.doi.org/10.13039/501100001712
UNSPECIFIED[NWO] Nederlandse Organisatie voor Wetenschappelijk Onderzoekhttp://dx.doi.org/10.13039/501100003246
UNSPECIFIEDMinisterstwo Nauki i Szkolnictwa WyższegoUNSPECIFIED
UNSPECIFIEDNarodowe Centrum Naukihttp://dx.doi.org/10.13039/501100004281
UNSPECIFIEDMinisterul Educației NaționaleUNSPECIFIED
UNSPECIFIEDInstitute of Atomic PhysicsUNSPECIFIED
UNSPECIFIEDFederal Agency for Scientific Organizationshttp://dx.doi.org/10.13039/501100013176
UNSPECIFIEDMinisterio de Economía, Industria y Competitividad, Gobierno de EspañaUNSPECIFIED
UNSPECIFIEDSchweizerischer Nationalfonds zur Förderung der Wissenschaftlichen ForschungUNSPECIFIED
UNSPECIFIEDStaatssekretariat für Bildung, Forschung und InnovationUNSPECIFIED
UNSPECIFIEDH2020 Marie Skłodowska-Curie ActionsUNSPECIFIED
UNSPECIFIEDEuropean Research Councilhttp://dx.doi.org/10.13039/501100000781
UNSPECIFIEDEuropean Particle physics LatinAmerican NETwork UNSPECIFIED
UNSPECIFIEDA.G. Leventis Foundationhttp://dx.doi.org/10.13039/501100004117
UNSPECIFIEDAlfred P. Sloan Foundationhttp://dx.doi.org/10.13039/100000879
UNSPECIFIEDAlexander von Humboldt-Stiftunghttp://dx.doi.org/10.13039/100005156
UNSPECIFIEDBelgian Federal Science Policy Officehttp://dx.doi.org/10.13039/501100002749
UNSPECIFIEDFonds pour la Formation à la Recherche dans l’Industrie et dans l’AgricultureUNSPECIFIED
UNSPECIFIEDAgentschap voor Innovatie door Wetenschap en Technologiehttp://dx.doi.org/10.13039/501100003132
UNSPECIFIEDMinisterstvo Školství, Mládeže a TělovýchovyUNSPECIFIED
UNSPECIFIEDBangladesh Council of Scientific and Industrial Researchhttp://dx.doi.org/10.13039/501100005999
UNSPECIFIEDFundacja na rzecz Nauki Polskiejhttp://dx.doi.org/10.13039/501100001870
UNSPECIFIEDEuropean Commissionhttp://dx.doi.org/10.13039/501100000780
UNSPECIFIEDCompagnia di San Paolohttp://dx.doi.org/10.13039/100007388
UNSPECIFIEDConsorzio per la Fisica TriesteUNSPECIFIED
20108T4XTMMinistero dell’Istruzione, dell’Università e della RicercaUNSPECIFIED
UNSPECIFIEDEuropean Social Fundhttp://dx.doi.org/10.13039/501100004895
UNSPECIFIEDNational Strategic Reference FrameworkUNSPECIFIED
UNSPECIFIEDQatar National Research Fundhttp://dx.doi.org/10.13039/100008982
UNSPECIFIEDEuropean Particle physics LatinAmerican NETwork UNSPECIFIED
UNSPECIFIEDH2020 Marie Skłodowska-Curie ActionsUNSPECIFIED
UNSPECIFIEDEuropean Research Councilhttp://dx.doi.org/10.13039/501100000781
UNSPECIFIEDHaute-Savoie (France). Conseil généralhttp://viaf.org/viaf/141489615
UNSPECIFIEDLabex ENIGMASSUNSPECIFIED
UNSPECIFIEDOrigine, Constituants et Evolution de l'UniversUNSPECIFIED
UNSPECIFIEDConseil Régional d'AuvergneUNSPECIFIED
UNSPECIFIEDРоссийский Фонд Фундаментальных Исследований (РФФИ)UNSPECIFIED
UNSPECIFIEDXunta de Galiciahttp://dx.doi.org/10.13039/501100010801
UNSPECIFIEDGeneralitat de Catalunyahttp://dx.doi.org/10.13039/501100002809
UNSPECIFIED[RS] Royal Societyhttp://dx.doi.org/10.13039/501100000288
UNSPECIFIEDRoyal Commission for the Exhibition of 1851http://dx.doi.org/10.13039/501100000700

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