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M, Zdybal M, Zenaiev O, Zeng M, Zhang D, Zhang L, Zhang S, Zhang Y, Zhang Y, Zharkova A, Zhelezov A, Zheng Y, Zhou X, Zhou Y, Zhu X, Zhu Z, Zhukov V, Zonneveld J B, Zou Q, Zucchelli S, Zuliani D, Zunica G
Nikhef National Institute for Subatomic Physics, Amsterdam, Netherlands.
Physik-Institut, Universität Zürich, Zürich, Switzerland.
Phys Rev Lett. 2022 Jan 28;128(4):041801. doi: 10.1103/PhysRevLett.128.041801.
Branching fraction and effective lifetime measurements of the rare decay B_{s}^{0}→μ^{+}μ^{-} and searches for the decays B^{0}→μ^{+}μ^{-} and B_{s}^{0}→μ^{+}μ^{-}γ are reported using proton-proton collision data collected with the LHCb detector at center-of-mass energies of 7, 8, and 13 TeV, corresponding to a luminosity of 9 fb^{-1}. The branching fraction B(B_{s}^{0}→μ^{+}μ^{-})=(3.09_{-0.43-0.11}^{+0.46+0.15})×10^{-9} and the effective lifetime τ(B_{s}^{0}→μ^{+}μ^{-})=2.07±0.29±0.03 ps are measured, where the first uncertainty is statistical and the second systematic. No significant signal for B^{0}→μ^{+}μ^{-} and B_{s}^{0}→μ^{+}μ^{-}γ decays is found and upper limits B(B^{0}→μ^{+}μ^{-})<2.6×10^{-10} and B(B_{s}^{0}→μ^{+}μ^{-}γ)<2.0×10^{-9} at the 95% C.L. are determined, where the latter is limited to the range m_{μμ}>4.9 GeV/c^{2}. The results are in agreement with the standard model expectations.
报告了利用大型强子对撞机底夸克探测器（LHCb）在质心能量为7、8和13 TeV（对应光度为9 fb⁻¹）时收集的质子-质子碰撞数据，对稀有衰变Bₛ⁰→μ⁺μ⁻的分支比和有效寿命进行的测量，以及对衰变B⁰→μ⁺μ⁻和Bₛ⁰→μ⁺μ⁻γ的搜索。测量得到分支比B(Bₛ⁰→μ⁺μ⁻) = (3.09₋₀.₄₃₋₀.₁₁⁺₀.₄₆⁺₀.₁₅)×10⁻⁹，有效寿命τ(Bₛ⁰→μ⁺μ⁻) = 2.07±0.29±0.03 ps，其中第一个不确定度为统计不确定度，第二个为系统不确定度。未发现B⁰→μ⁺μ⁻和Bₛ⁰→μ⁺μ⁻γ衰变的显著信号，并确定了在95%置信水平下的上限B(B⁰→μ⁺μ⁻) < 2.6×10⁻¹⁰和B(Bₛ⁰→μ⁺μ⁻γ) < 2.0×10⁻⁹，其中后者限制在mμμ > 4.9 GeV/c²的范围内。结果与标准模型预期相符。
