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Search for Lepton-Universality Violation in B+→K+ℓ+ℓ−Decays
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LHCb Collaboration (Including: Back, J. J., Blake, T., Brossa Gonzalo, A., Costa Sobral, C. M. , Crocombe, A., Gershon, T. , Kreps, M., Latham, T., Loh, D., Lupton, O., Millard, E. and Vesterinen, M.). (2019) Search for Lepton-Universality Violation in B+→K+ℓ+ℓ−Decays. Physical Review Letters, 122 (19). 191801. doi:10.1103/PhysRevLett.122.191801 ISSN 0031-9007.
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PhysRevLett.122.191801.pdf - Published Version - Requires a PDF viewer. Available under License Creative Commons Attribution 4.0. Download (397Kb) | Preview |
Official URL: https://doi.org/10.1103/PhysRevLett.122.191801
Abstract
A measurement of the ratio of branching fractions of the decays B+→K+μ+μ− and B+→K+e+e− is presented. The proton-proton collision data used correspond to an integrated luminosity of 5.0 fb−1 recorded with the LHCb experiment at center-of-mass energies of 7, 8, and 13 TeV. For the dilepton mass-squared range 1.1<q2<6.0 GeV2/c4 the ratio of branching fractions is measured to be RK=0.846+0.060−0.054+0.016−0.014, where the first uncertainty is statistical and the second systematic. This is the most precise measurement of RK to date and is compatible with the standard model at the level of 2.5 standard deviations.
| Item Type: | Journal Article | ||||||
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| Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||||
| Journal or Publication Title: | Physical Review Letters | ||||||
| Publisher: | American Physical Society | ||||||
| ISSN: | 0031-9007 | ||||||
| Official Date: | 13 May 2019 | ||||||
| Dates: |
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| Volume: | 122 | ||||||
| Number: | 19 | ||||||
| Article Number: | 191801 | ||||||
| DOI: | 10.1103/PhysRevLett.122.191801 | ||||||
| Status: | Peer Reviewed | ||||||
| Publication Status: | Published | ||||||
| Access rights to Published version: | Open Access (Creative Commons) | ||||||
| Date of first compliant deposit: | 19 May 2020 | ||||||
| Date of first compliant Open Access: | 19 May 2020 |
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