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Observation of the suppressed decay Λb0 → pπ−μ+μ−

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LHCb Collaboration (Including: Back, J. J., Blake, Thomas, Costa Sobral, Cayo, Crocombe, Andrew, Gershon, T. J., Kreps, Michal, Latham, Thomas, Loh, David, Mathad, Abhijit , O'Hanlon, Daniel P., Poluektov, Anton, Wallace, Charlotte and Wicht, Jean). (2017) Observation of the suppressed decay Λb0 → pπ−μ+μ−. Journal of High Energy Physics, 2017 (4). 29. doi:10.1007/jhep04(2017)029 ISSN 1029-8479.

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Official URL: http://doi.org/10.1007/jhep04(2017)029

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Abstract

The suppressed decay Λb0 → pπ−μ+μ−, excluding the J/ψ and ψ(2S) → μ+μ− resonances, is observed for the first time with a significance of 5.5 standard deviations. The analysis is performed with proton-proton collision data corresponding to an integrated luminosity of 3 fb−1 collected with the LHCb experiment. The Λb0 → pπ−μ+μ− branching fraction is measured relative to the Λb0 → J/ψ(→μ+μ−)pπ− branching fraction giving

ℬΛb0→pπ−μ+μ−
_____________ =0.044±0.012±0.007

ℬΛb0→J/ψ→μ+μ−pπ−

where the first uncertainty is statistical and the second is systematic. This is the first observation of a b → d transition in a baryonic decay.

Item Type: Journal Article
Subjects: Q Science > QC Physics
Divisions: Faculty of Science, Engineering and Medicine > Science > Physics
SWORD Depositor: Library Publications Router
Library of Congress Subject Headings (LCSH): Large Hadron Collider (France and Switzerland), Branching fractions (Nuclear physics), Hadrons -- Scattering
Journal or Publication Title: Journal of High Energy Physics
Publisher: Springer
ISSN: 1029-8479
Official Date: 6 April 2017
Dates:
DateEvent
6 April 2017Published
20 March 2017Accepted
Volume: 2017
Number: 4
Article Number: 29
DOI: 10.1007/jhep04(2017)029
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Open Access (Creative Commons)
Date of first compliant deposit: 27 June 2018
Date of first compliant Open Access: 27 June 2018
RIOXX Funder/Project Grant:
Project/Grant IDRIOXX Funder NameFunder ID
UNSPECIFIEDCERNhttp://dx.doi.org/10.13039/100012470
UNSPECIFIEDCoordenação de Aperfeiçoamento de Pessoal de Nível Superiorhttp://dx.doi.org/10.13039/501100002322
UNSPECIFIEDConselho Nacional de Desenvolvimento Científico e Tecnológicohttp://dx.doi.org/10.13039/501100003593
UNSPECIFIEDFundação Carlos Chagas Filho de Amparo à Pesquisa do Estado do Rio de Janeirohttp://dx.doi.org/10.13039/501100004586
UNSPECIFIEDFinanciadora de Estudos e Projetoshttp://dx.doi.org/10.13039/501100004809
UNSPECIFIED[MSTPRC] Ministry of Science and Technology of the People's Republic of Chinahttp://dx.doi.org/10.13039/501100002855
UNSPECIFIED[NSFC] National Natural Science Foundation of Chinahttp://dx.doi.org/10.13039/501100001809
UNSPECIFIED[CNRS] Centre National de la Recherche Scientifiquehttp://dx.doi.org/10.13039/501100004794
UNSPECIFIED[IN2P3] Institut national de physique nucléaire et de physique des particuleshttp://viaf.org/viaf/137207166
UNSPECIFIEDBundesministerium für Bildung und Forschunghttp://dx.doi.org/10.13039/501100002347
UNSPECIFIED[DFG] Deutsche Forschungsgemeinschafthttp://dx.doi.org/10.13039/501100001659
UNSPECIFIEDMax-Planck-Gesellschafthttp://dx.doi.org/10.13039/501100004189
UNSPECIFIED[INFN] Instituto Nazionale di Fisica Nuclearehttp://dx.doi.org/10.13039/501100004007
UNSPECIFIED[NWO] Nederlandse Organisatie voor Wetenschappelijk Onderzoekhttp://dx.doi.org/10.13039/501100003246
UNSPECIFIEDMinisterstwo Nauki i Szkolnictwa Wyższegohttp://dx.doi.org/10.13039/501100004569
UNSPECIFIEDNarodowe Centrum Naukihttp://dx.doi.org/10.13039/501100004281
UNSPECIFIEDMinisterul Educatiei Nationalehttp://dx.doi.org/10.13039/501100003766
UNSPECIFIEDInstitutul de Fizică Atomicăhttp://viaf.org/viaf/154740159
UNSPECIFIED[MES] Ministry of Education and Science of the Russian Federationhttp://dx.doi.org/10.13039/501100003443
UNSPECIFIEDRussia. Federal'noe agentstvo nauc?nych organizacij [Federal Agency for Scientific Organizations] (FASO)UNSPECIFIED
UNSPECIFIED[MINECO] Ministerio de Economía y Competitividadhttp://dx.doi.org/10.13039/501100003329
UNSPECIFIED[SNSF] Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschunghttp://dx.doi.org/10.13039/501100001711
UNSPECIFIED[SERI] Staatssekretariat für Bildung, Forschung und Innovationhttp://dx.doi.org/10.13039/501100007352
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/10.13039/100000001
UNSPECIFIEDKarlsruher Institut für Technologiehttp://dx.doi.org/10.13039/100009133
UNSPECIFIEDDeutsches Elektronen-Synchrotronhttp://dx.doi.org/10.13039/501100001647
UNSPECIFIEDNetherlands. SURFsara (Organisation)UNSPECIFIED
UNSPECIFIEDSpain. Port d'Informació Científica (Organisation)UNSPECIFIED
UNSPECIFIEDGreat Britain. Distributed Computing for Data-Intensive Research (GridPP)UNSPECIFIED
UNSPECIFIEDRossiĭskiĭ nauchnyĭ t︠s︡entr "Kurchatovskiĭ institut"http://viaf.org/viaf/147389325
UNSPECIFIEDI︠A︡ndeks (Firm)http://viaf.org/viaf/138596770
UNSPECIFIEDSwiss National Supercomputing CentreUNSPECIFIED
UNSPECIFIEDInstitutul Naţional de Fizică şi Inginerie Nucleară - Horia Hulubei Măgurelehttp://viaf.org/viaf/139349611
UNSPECIFIEDCentro brasileiro de pesquisas fisicashttp://viaf.org/viaf/124062514
PL-Grid project (Polish Infrastructure for Supporting Computational Science in the European Research Space)[ERDF] European Regional Development Fundhttp://dx.doi.org/10.13039/501100008530
UNSPECIFIEDOhio Supercomputer Centerhttp://viaf.org/viaf/131669411
UNSPECIFIEDAlexander von Humboldt-Stiftunghttp://dx.doi.org/10.13039/100005156
EPLANETEuropean Commissionhttp://dx.doi.org/10.13039/501100000780
UNSPECIFIEDH2020 Marie Skłodowska-Curie Actionshttp://dx.doi.org/10.13039/100010665
UNSPECIFIEDEuropean Research Council http://viaf.org/viaf/130022607
UNSPECIFIEDConseil Général de Haute-SavoieUNSPECIFIED
UNSPECIFIEDLabEx ENIGMASSUNSPECIFIED
UNSPECIFIEDRégion Auvergne (France)UNSPECIFIED
UNSPECIFIED[RFBR] Russian Foundation for Basic Researchhttp://dx.doi.org/10.13039/501100002261
UNSPECIFIEDGeneralitat Valencianahttp://dx.doi.org/10.13039/501100003359
UNSPECIFIEDSecretaria Xeral de Investigación e Desenvolvemento, Xunta de Galiciahttp://dx.doi.org/10.13039/501100010568
UNSPECIFIEDGeneralitat de Catalunyahttp://dx.doi.org/10.13039/501100002809
UNSPECIFIEDHerchel Smith FundUNSPECIFIED
UNSPECIFIED[RS] Royal Societyhttp://dx.doi.org/10.13039/501100000288
UNSPECIFIEDRoyal Commission for the Exhibition of 1851http://dx.doi.org/10.13039/501100000700
UNSPECIFIEDLeverhulme Trusthttp://dx.doi.org/10.13039/501100000275

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