Search for Lepton-Flavor Violating Decays B+ --> K+ mu± e∓

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dc.contributor.affiliationUniversidade de Santiago de Compostela. Instituto Galego de Física de Altas Enerxías (IGFAE)
dc.contributor.affiliationUniversidade de Santiago de Compostela. Departamento de Física de Partículas
dc.contributor.authorLHCb Collaboration
dc.contributor.authorR. Aaij
dc.contributor.authorAdeva Andany, Bernardo
dc.contributor.authorAlves, António Augusto
dc.contributor.authorBoente García, Óscar
dc.contributor.authorBrea Rodríguez, Alexandre
dc.contributor.authorCasais Vidal, Adrián
dc.contributor.authorChobanova, Veronika
dc.contributor.authorCid Vidal, Xabier
dc.contributor.authorDalseno, Jeremy
dc.contributor.authorDosil Suárez, Álvaro
dc.contributor.authorFernández Prieto, Antonio
dc.contributor.authorGallas Torreira, Abraham
dc.contributor.authorGarcía Plana, Beatriz
dc.contributor.authorGioventù, Alessandra
dc.contributor.authorLomba Castro, Julián
dc.contributor.authorMartínez Santos, Diego
dc.contributor.authorPló Casasús, Máximo
dc.contributor.authorProuve, Claire
dc.contributor.authorRamos Pernas, Miguel
dc.contributor.authorRomero Vidal, Antonio
dc.contributor.authorSaborido Silva, Juan José
dc.contributor.authorSanmartín Sedes, Brais
dc.contributor.authorSantamarina Ríos, Cibrán
dc.contributor.authorVázquez Regueiro, Pablo
dc.date.accessioned2026-01-21T09:50:07Z
dc.date.available2026-01-21T09:50:07Z
dc.date.issued2019-12-12
dc.description.abstractA search for the lepton-flavor violating decays 𝐵+ →𝐾+⁢𝜇±⁢𝑒∓ is performed using a sample of proton-proton collision data, collected with the LHCb experiment at center-of-mass energies of 7 and 8 TeV and corresponding to an integrated luminosity of 3  fb−1. No significant signal is observed, and upper limits on the branching fractions are set as ℬ⁡(𝐵+→𝐾+⁢𝜇−⁢𝑒+)<7.0⁢(9.5)×10−9 and ℬ⁡(𝐵+→𝐾+⁢𝜇+⁢𝑒−)<6.4⁢(8.8)×10−9 at 90% (95)% confidence level. The results improve the current best limits on these decays by more than one order of magnitude
dc.description.peerreviewedSI
dc.description.sponsorshipWe 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); MEN/IFA (Romania); MSHE (Russia); MinECo (Spain); SNSF and SER (Switzerland); NASU (Ukraine); STFC (United Kingdom); DOE NP and NSF (USA). 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), RRCKI and Yandex LLC (Russia), CSCS (Switzerland), IFIN-HH (Romania), CBPF (Brazil), PL-GRID (Poland) and OSC (USA). 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 AvH Foundation (Germany); EPLANET, Marie Skłodowska-Curie Actions, and ERC (European Union); ANR, Labex P2IO, and OCEVU, and R´egion Auvergne-Rhône-Alpes (France); Key Research Program of Frontier Sciences of CAS, CAS PIFI, and the Thousand Talents Program (China); RFBR, RSF, and Yandex LLC (Russia); GVA, XuntaGal, and GENCAT (Spain); the Royal Society and the Leverhulme Trust (United Kingdom).
dc.identifier.citationR. Aaij, C. Abellán Beteta, T. Ackernley, B. Adeva, M. Adinolfi, C. A. Aidala, Z. Ajaltouni, S. Akar, P. Albicocco et al. (LHCb Collaboration). Search for Lepton-Flavor Violating Decays 𝐵+→𝐾+⁢𝜇±⁢𝑒∓. Phys. Rev. Lett. 123, 241802 – Published 12 December, 2019
dc.identifier.doi10.1103/PhysRevLett.123.241802
dc.identifier.essn1079-7114
dc.identifier.urihttps://hdl.handle.net/10347/45298
dc.journal.titlePhysical Review Letters
dc.language.isoeng
dc.page.final241802-11
dc.page.initial241802-1
dc.publisherAmerican Physical Society
dc.relation.publisherversionhttps://doi.org/10.1103/PhysRevLett.123.241802
dc.rights© 2019 CERN, for the LHCb Collaboration. Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license
dc.rights.accessRightsopen access
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/
dc.subjectLepton Flavor Violation
dc.subjectHeavy Flavor
dc.subjectLHCb
dc.subjectB mesons
dc.subjectHadron Colliders
dc.subject.classification2290 Física altas energías
dc.titleSearch for Lepton-Flavor Violating Decays B+ --> K+ mu± e∓
dc.typejournal article
dc.type.hasVersionVoR
dc.volume.number123
dspace.entity.typePublication
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