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

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2019_PhysRevLet_Aaij_Search.pdf (345.13 KB)
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URI: https://hdl.handle.net/10347/45298
E-ISSN: 1079-7114
DOI: 10.1103/PhysRevLett.123.241802

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2019-12-12

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American Physical Society
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Abstract

A 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

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Lepton Flavor Violation| Heavy Flavor| LHCb| B mesons| Hadron Colliders

Bibliographic citation

R. 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

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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); 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).

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© 2019 CERN, for the LHCb Collaboration. Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license

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