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Search for decays of neutral beauty mesons into four muons

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Figure

Figure 1. Feynman diagrams for (a) the non-resonant B0(s) → µ+µ−µ+µ− decay, (b) a supersym-metric B0(s) → S(→ µ+µ−)P(→ µ+µ−) decay and (c) the resonant B0s → J/ψ(→ µ+µ−)φ(→ µ+µ−)decay (see text).
Table 1. Definitions of intervals in the B0 and B0s reconstructed invariant mass distributions.
Figure 2. Fit to the B+ → J/ψ(→ µ+µ−)K+ invariant mass distribution. The signal contributionis modelled by a Hypatia2 [26] function (blue dotted line), the combinatorial background by anexponential function (green dash-dotted line)
Table 2. Summary of systematic uncertainties affecting the single event sensitivities along withthe total systematic uncertainty calculated by adding up the individual components in quadrature.The dominating uncertainty arising from fu/fs only contributes to ηs.The uncertainty of thestated selection efficiencies arising from the limited number of simulated events is 0.5% for B0 →µ+µ−µ+µ− and 0.4% for all other considered decay modes.
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