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Study of the rare decays of B⁰_s and B⁰ mesons into muon pairs using data collected during 2015 and 2016 with the ATLAS detector
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Study of the rare decays of B⁰_s and B⁰ mesons into muon pairs using data collected during 2015 and 2016 with the ATLAS detector
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A study of the decays $B^0_s \to \mu^+\mu^-$ and $B^0 \to \mu^+\mu^-$ has been performed using 26.3 fb$^{-1}$ of 13 TeV LHC proton-proton collision data collected with the ATLAS detector in 2015 and 2016. Since the detector resolution in $\mu^+\mu^-$ invariant mass is comparable to the $B_{s}^{0}$-$B^0$ mass difference, a single fit determines the signal yields for both decay modes. This results in a measurement of the branching fraction ${\cal B}(B^0_s \to \mu^+\mu^-) = \left( 3.2^{+1.1}_{-1.0} \right) \times 10^{-9}$ and an upper limit ${\cal B}(B^0 \to \mu^+\mu^-) < 4.3 \times 10^{-10}$ at 95% confidence level. The result is combined with the Run 1 ATLAS result, yielding ${\cal B}(B^0_s \to \mu^+\mu^-) = \left( 2.8^{+0.8}_{-0.7} \right) \times 10^{-9}$ and ${\cal B}(B^0 \to \mu^+\mu^-) < 2.1 \times 10^{-10}$ at 95% confidence level. The combined result is consistent with the Standard Model prediction within 2.4 standard deviations in the ${\cal B}(B^0 \to \mu^+\mu^-)$-${\cal B}(B^0_s \to \mu^+\mu^-)$ plane.
Forward citations
Cited by 3 Pith papers
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A Dispersive Look at Rare $B$-meson Semileptonic Decays
A global fit of b→s ℓ+ℓ− and b→s νν data finds that hadronic charm-loop effects, not a new short-distance coupling C9, can explain the observed anomalies.
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A Dispersive Look at Rare $B$-meson Semileptonic Decays
Lattice-only Dispersive Matrix form factors enlarge large-recoil uncertainties and, with new angular data, favour long-distance hadronic effects over a short-distance C9 New Physics shift.
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$B \to X_{\mathrm{s}} l^{+} l^{-}$ in the $\mu$ from $\nu$ Supersymmetric Standard Model
In the μνSSM, B→X_s l+l− is dominated by charged-Higgs C7 in the low-q² region and C9/C10 Z-penguins in the high-q² region, with the forward-backward asymmetry set by C7C10 and C9C10 interference.
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