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First measurement of the C P -violating phase in B s 0 → J / ψ ( → e + e - ) ϕ decays

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LHCb Collaboration (Including: Back, J. J., Blake, Thomas, Brossa Gonzalo, A., Cicala, M. F., Costa Sobral, C. M. , Garcia Martin, L. M., Gershon, T. J., Hunter, R. J., Jones, T. P., Kenzie, M., Kreps, Michal, Latham, T. E., Lupton, Oliver, Millard, E., Morris, A. G., Pagare, B., Ramos Pernas, M., Sahoo, Niladri and Vesterinen, Mikael Anton). (2021) First measurement of the C P -violating phase in B s 0 → J / ψ ( → e + e - ) ϕ decays. The European Physical Journal C, 81 (11). 1026. doi:10.1140/epjc/s10052-021-09711-7 ISSN 1434-6044.

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Official URL: https://doi.org/10.1140/epjc/s10052-021-09711-7

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Abstract

A flavour-tagged time-dependent angular analysis of Bs0→J/ψϕ decays is presented where the J/ψ meson is reconstructed through its decay to an e+e- pair. The analysis uses a sample of pp collision data recorded with the LHCb experiment at centre-of-mass energies of 7 and 8\,Te V, corresponding to an integrated luminosity of 3\,fb-1. The CP-violating phase and lifetime parameters of the Bs0 system are measured to be ϕs=0.00±0.28±0.07\,rad, ΔΓs=0.115±0.045±0.011\,ps-1 and Γs=0.608±0.018±0.012\,ps-1 where the first uncertainty is statistical and the second systematic. This is the first time that CP-violating parameters are measured in the Bs0→J/ψϕ decay with an e+e- pair in the final state. The results are consistent with previous measurements in other channels and with the Standard Model predictions.

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): B mesons -- Decay, CP violation (Nuclear physics), Large Hadron Collider (France and Switzerland), Particles (Nuclear physics)
Journal or Publication Title: The European Physical Journal C
Publisher: Springer
ISSN: 1434-6044
Official Date: 24 November 2021
Dates:
DateEvent
24 November 2021Published
4 October 2021Accepted
Volume: 81
Number: 11
Article Number: 1026
DOI: 10.1140/epjc/s10052-021-09711-7
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Open Access (Creative Commons)
Date of first compliant deposit: 8 December 2021
Date of first compliant Open Access: 8 December 2021
RIOXX Funder/Project Grant:
Project/Grant IDRIOXX Funder NameFunder ID
UNSPECIFIEDUK Research and Innovationhttp://dx.doi.org/10.13039/100014013
UNSPECIFIED[RS] Royal Societyhttp://dx.doi.org/10.13039/501100000288
UNSPECIFIEDLeverhulme Trusthttp://dx.doi.org/10.13039/501100000275
UNSPECIFIEDGeneralitat de Catalunyahttp://dx.doi.org/10.13039/501100002809
UNSPECIFIEDGeneralitat Valencianahttp://dx.doi.org/10.13039/501100003359
UNSPECIFIEDYandex LLC UNSPECIFIED
UNSPECIFIED[RSF] Russian Science Foundationhttp://dx.doi.org/10.13039/501100006769
UNSPECIFIED[RFBR] Russian Foundation for Basic Researchhttp://dx.doi.org/10.13039/501100002261
UNSPECIFIEDProgram of Guangzhou UNSPECIFIED
UNSPECIFIEDFundamental Research Funds for the Central Universitieshttp://dx.doi.org/10.13039/501100012226
UNSPECIFIEDZhongguo ke xue yuanhttp://viaf.org/viaf/168763948
UNSPECIFIEDOrigins, Constituents and EVolution of the UniverseUNSPECIFIED
UNSPECIFIEDRégion Auvergne-Rhône-AlpesUNSPECIFIED
UNSPECIFIEDLabex P2IO UNSPECIFIED
UNSPECIFIED[ANR] Agence Nationale de la Recherchehttp://dx.doi.org/10.13039/501100001665
UNSPECIFIEDAix-Marseille Initiative of excellenceUNSPECIFIED
UNSPECIFIEDEuropean Research Councilhttp://dx.doi.org/10.13039/501100000781
UNSPECIFIEDH2020 Marie Skłodowska-Curie Actionshttp://dx.doi.org/10.13039/100010665
UNSPECIFIEDEuropean Commissionhttp://dx.doi.org/10.13039/501100000780
UNSPECIFIEDAlexander von Humboldt-Stiftunghttp://dx.doi.org/10.13039/100005156
UNSPECIFIEDAustralian Research Data Commonshttp://viaf.org/viaf/220706131
UNSPECIFIED[ARC] Australian Research Councilhttp://dx.doi.org/10.13039/501100000923
UNSPECIFIEDNational Science Foundationhttp://dx.doi.org/10.13039/501100008982
UNSPECIFIEDNational Physical Science Consortiumhttp://dx.doi.org/10.13039/100013904
UNSPECIFIED[DOE] U.S. Department of Energyhttp://dx.doi.org/10.13039/100000015
UNSPECIFIED[STFC] Science and Technology Facilities Councilhttp://dx.doi.org/10.13039/501100000271
UNSPECIFIEDNational Academy of Sciences of Ukrainehttp://dx.doi.org/10.13039/501100004742
UNSPECIFIED[SERI] Staatssekretariat für Bildung, Forschung und Innovationhttp://dx.doi.org/10.13039/501100007352
UNSPECIFIED[SNSF] Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschunghttp://dx.doi.org/10.13039/501100001711
UNSPECIFIEDSpain. Ministerio de Ciencia e Innovaciónhttp://viaf.org/viaf/137614380
UNSPECIFIED[MES] Ministry of Education and Science of the Russian Federationhttp://dx.doi.org/10.13039/501100003443
UNSPECIFIEDInstitutul de Fizică Atomicăhttp://viaf.org/viaf/154740159
UNSPECIFIEDMinisterul Educaţiei Naţionalehttp://dx.doi.org/10.13039/501100003766
UNSPECIFIEDNarodowe Centrum Naukihttp://dx.doi.org/10.13039/501100004281
UNSPECIFIEDMinisterstwo Nauki i Szkolnictwa Wyższegohttp://dx.doi.org/10.13039/501100004569
UNSPECIFIED[NWO] Nederlandse Organisatie voor Wetenschappelijk Onderzoekhttp://dx.doi.org/10.13039/501100003246
UNSPECIFIED[INFN] Instituto Nazionale di Fisica Nuclearehttp://dx.doi.org/10.13039/501100004007
UNSPECIFIEDMax-Planck-Gesellschafthttp://dx.doi.org/10.13039/501100004189
UNSPECIFIED[DFG] Deutsche Forschungsgemeinschafthttp://dx.doi.org/10.13039/501100001659
UNSPECIFIEDBundesministerium für Bildung und Forschunghttp://dx.doi.org/10.13039/501100002347
UNSPECIFIED[IN2P3] Institut national de physique nucléaire et de physique des particuleshttp://viaf.org/viaf/137207166
UNSPECIFIED[CNRS] Centre National de la Recherche Scientifiquehttp://dx.doi.org/10.13039/501100004794
UNSPECIFIED[NSFC] National Natural Science Foundation of Chinahttp://dx.doi.org/10.13039/501100001809
UNSPECIFIED[MSTPRC] Ministry of Science and Technology of the People's Republic of Chinahttp://dx.doi.org/10.13039/501100002855
UNSPECIFIEDFinanciadora de Estudos e Projetoshttp://dx.doi.org/10.13039/501100004809
UNSPECIFIEDFundação Carlos Chagas Filho de Amparo à Pesquisa do Estado do Rio de Janeirohttp://dx.doi.org/10.13039/501100004586
UNSPECIFIEDConselho Nacional de Desenvolvimento Científico e Tecnológicohttp://dx.doi.org/10.13039/501100003593
UNSPECIFIEDCoordenação de Aperfeiçoamento de Pessoal de Nível Superiorhttp://dx.doi.org/10.13039/501100002322
UNSPECIFIEDCERNhttp://dx.doi.org/10.13039/100012470
Contributors:
ContributionNameContributor ID
Research GroupLHCb Collaboration, UNSPECIFIED

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