Abstract
Recently, the first evidence for the decay Bs0 → μ+μ− has been announced by the LHCb Collaboration and the measured branching ratio B(s0 → μ+) = (3.2−1.2+1.5) × 10−9 is in good agreement with the standard model (SM) expectation. It has also reported an upper limit for B(Bd0 → μ+μ−) < 9.4 × 10−10 at 95% confidence level. In this paper, we study the Bs0 → μ+μ− and Bd0 → μ+μ− rare decays in flavor-changing Z′ model. Our estimated branching ratios are enhanced from their SM values and provide signals for new physics.
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