First Observation of the Decay B s 0 → K − μ + ν μ and a Measurement of | V u b | / | V c b |
Name
PhysRevLett.126.081804.pdf
Description
Published version
Size
331 KB
Format
Adobe PDF
Checksum (MD5)
b996f0946c47910d7fccdd07fea525d1
Author(s)
Williams, Michael
Date Issued
2021
Journal
Physical Review Letters
Publisher
American Physical Society (APS)
Citation
Williams, Michael. 2021. "First Observation of the Decay B s 0 → K − μ + ν μ and a Measurement of | V u b | / | V c b |." Physical Review Letters, 126 (8).
Version
Final published version
Abstract
© 2021 CERN. The first observation of the suppressed semileptonic Bs0→K-μ+νμ decay is reported. Using a data sample recorded in pp collisions in 2012 with the LHCb detector, corresponding to an integrated luminosity of 2 fb-1, the branching fraction B(Bs0→K-μ+νμ) is measured to be [1.06±0.05(stat)±0.08(syst)]×10-4, where the first uncertainty is statistical and the second one represents the combined systematic uncertainties. The decay Bs0→Ds-μ+νμ, where Ds- is reconstructed in the final state K+K-π-, is used as a normalization channel to minimize the experimental systematic uncertainty. Theoretical calculations on the form factors of the Bs0→K- and Bs0→Ds- transitions are employed to determine the ratio of the Cabibbo-Kobayashi-Maskawa matrix elements |Vub|/|Vcb| at low and high Bs0→K- momentum transfer.
MIT Department
Massachusetts Institute of Technology. Department of Physics
Terms of Use
Creative Commons Attribution 4.0 International License
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DOI of Published Version
https://doi.org/10.1103/PHYSREVLETT.126.081804
