Analysis of Neutral B-Meson Decays into Two Muons
Name
PhysRevLett.128.041801.pdf
Description
Published version
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423.64 KB
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Adobe PDF
Checksum (MD5)
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Author(s)
Williams, Michael
Date Issued
January 28, 2022
Journal
Physical Review Letters
Publisher
American Physical Society (APS)
Citation
Williams, Michael. 2022. "Analysis of Neutral B-Meson Decays into Two Muons." Physical Review Letters, 128 (4).
Version
Final published version
Abstract
Branching fraction and effective lifetime measurements of the rare decay
$B^0_s\to\mu^+\mu^-$ and searches for the decays $B^0\to\mu^+\mu^-$ and
$B^0_s\to\mu^+\mu^-\gamma$ are reported using proton-proton collision data
collected with the LHCb detector at centre-of-mass energies of $7$ TeV, $8$ TeV
and $13$ TeV, corresponding to a luminosity of $9$ fb$^{-1}$. The branching
fraction
${\mathcal{B}}(B^0_s\to\mu^+\mu^-)=\left(3.09^{+0.46+0.15}_{-0.43-0.11}\right)\times
10^{-9}$ and the effective lifetime $\tau(B^0_s\to\mu^+\mu^-)=(2.07\pm 0.29\pm
0.03)$ are measured, where the first uncertainty is statistical and the second
systematic. No significant signal for $B^0\to\mu^+\mu^-$ and
$B^0_s\to\mu^+\mu^-\gamma$ decays is found and upper limits
$\mathcal{B}(B^0\to\mu^+\mu^-)<2.6\times 10^{-10}$ and
$\mathcal{B}(B^0_s\to\mu^+\mu^-\gamma)<2.0\times 10^{-9}$ at the 95% CL are
determined, where the latter is limited to the range $m_{\mu\mu} > 4.9$
GeV$/c^2$. The results are in agreement with the Standard Model expectations.
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.128.041801
