Measurement of the <i>B</i><SUP>0</SUP><i><sub>s</sub></i> → μ<SUP>+</SUP>μ<SUP>-</SUP> decay properties and search for the <i>B</i><SUP>0</SUP> → μ<SUP>+</SUP>μ<i><SUP>-</SUP></i> and <i>B</i><SUP>0</SUP><i><sub>s</sub></i> → μ<i><SUP>+</SUP></i>μ<i><SUP>-</SUP></i> γ decays



Aaij, R, Beteta, C Abellan, Ackernley, T, Adeva, B, Adinolfi, M, Afsharnia, H, Aidala, CA, Aiola, S, Ajaltouni, Z, Akar, S
et al (show 954 more authors) (2022) Measurement of the <i>B</i><SUP>0</SUP><i><sub>s</sub></i> → μ<SUP>+</SUP>μ<SUP>-</SUP> decay properties and search for the <i>B</i><SUP>0</SUP> → μ<SUP>+</SUP>μ<i><SUP>-</SUP></i> and <i>B</i><SUP>0</SUP><i><sub>s</sub></i> → μ<i><SUP>+</SUP></i>μ<i><SUP>-</SUP></i> γ decays. PHYSICAL REVIEW D, 105 (1). 012010-.

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Abstract

An improved measurement of the 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 performed at the LHCb experiment using data collected in proton-proton collisions at $\sqrt{s} = 7,~8$ and $13$ TeV, corresponding to integrated luminosities of 1, 2 and 6 fb$^{-1}$, respectively. The $B^0_s\to\mu^+\mu^-$ branching fraction and effective lifetime are measured to be ${\mathcal{B}}(B^0_s\to\mu^+\mu^-)=\left(3.09^{+0.46+0.15}_{-0.43-0.11}\right)\times 10^{-9}$ and $\tau(B^0_s\to\mu^+\mu^-)=(2.07\pm 0.29\pm 0.03)$ ps, respectively, where the uncertainties include both statistical and systematic contributions. No significant signal for $B^0\to\mu^+\mu^-$ and $B^0_s\to\mu^+\mu^-\gamma$ decays is found and the 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 95% confidence level are determined, where the latter is limited to the range $m_{\mu\mu} > 4.9$ GeV$/c^2$. Additionally, the ratio between the $B^0\to\mu^+\mu^-$ and $B^0_s\to\mu^+\mu^-$ branching fractions is measured to be $\mathcal{R}_{\mu^+\mu^-}<0.095$ at 95% confidence level. The results are in agreement with the Standard Model predictions.

Item Type: Article
Additional Information: All figures and tables, along with machine-readable versions and any supplementary material and additional information, are available at https://cern.ch/lhcbproject/Publications/p/LHCb-PAPER-2021-008.html. V3 contains the version published in Phys. Rev. D
Uncontrolled Keywords: hep-ex, hep-ex
Divisions: Faculty of Science and Engineering > School of Physical Sciences
Depositing User: Symplectic Admin
Date Deposited: 13 May 2022 13:57
Last Modified: 12 Oct 2023 17:52
DOI: 10.1103/PhysRevD.105.012010
Open Access URL: https://journals.aps.org/prd/abstract/10.1103/Phys...
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URI: https://livrepository.liverpool.ac.uk/id/eprint/3154750