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Yang Z, Yang Z, Yao Y, Yin H, Yu J, Yuan X, Yushchenko O, Zarebski K A, Zavertyaev M, Zhang L, Zhang Y, Zhelezov A, Zheng Y, Zhu X, Zhukov V, Zucchelli S
European Organization for Nuclear Research (CERN), Geneva, Switzerland.
Universidad de Santiago de Compostela, Santiago de Compostela, Spain.
Phys Rev Lett. 2017 Sep 8;119(10):101801. doi: 10.1103/PhysRevLett.119.101801.
We report on a measurement of the flavor-specific B_{s}^{0} lifetime and of the D_{s}^{-} lifetime using proton-proton collisions at center-of-mass energies of 7 and 8 TeV, collected by the LHCb experiment and corresponding to 3.0 fb^{-1} of integrated luminosity. Approximately 407 000 B_{s}^{0}→D_{s}^{()-}μ^{+}ν_{μ} decays are partially reconstructed in the K^{+}K^{-}π^{-}μ^{+} final state. The B_{s}^{0} and D_{s}^{-} natural widths are determined using, as a reference, kinematically similar B^{0}→D^{()-}μ^{+}ν_{μ} decays reconstructed in the same final state. The resulting differences between widths of B_{s}^{0} and B^{0} mesons and of D_{s}^{-} and D^{-} mesons are Δ_{Γ}(B)=-0.0115±0.0053(stat)±0.0041(syst) ps^{-1} and Δ_{Γ}(D)=1.0131±0.0117(stat)±0.0065(syst) ps^{-1}, respectively. Combined with the known B^{0} and D^{-} lifetimes, these yield the flavor-specific B_{s}^{0} lifetime, τ_{B_{s}^{0}}^{fs}=1.547±0.013(stat)±0.010(syst)±0.004(τ_{B}) ps and the D_{s}^{-} lifetime, τ_{D_{s}^{-}}=0.5064±0.0030(stat)±0.0017(syst)±0.0017(τ_{D}) ps. The last uncertainties originate from the limited knowledge of the B^{0} and D^{-} lifetimes. The results improve upon current determinations.
我们报告了使用大型强子对撞机底夸克实验（LHCb experiment）在质心能量为7和8 TeV的质子 - 质子碰撞中收集的、对应于3.0 fb⁻¹积分亮度的数据，对味特定的Bₛ⁰寿命和Dₛ⁻寿命进行的测量。在K⁺K⁻π⁻μ⁺末态中部分重建了约407000次Bₛ⁰→Dₛ⁽⁎⁾⁻μ⁺νₑ衰变。以在相同末态中重建的运动学相似的B⁰→D⁽⁎⁾⁻μ⁺νₑ衰变为参考，确定了Bₛ⁰和Dₛ⁻的自然宽度。Bₛ⁰和B⁰介子宽度以及Dₛ⁻和D⁻介子宽度的结果差异分别为ΔΓ(B)= -0.0115±0.0053(统计)±0.0041(系统) ps⁻¹和ΔΓ(D)= 1.0131±0.0117(统计)±0.0065(系统) ps⁻¹。结合已知的B⁰和D⁻寿命，这些结果给出了味特定的Bₛ⁰寿命τBₛ⁰fs = 1.547±0.013(统计)±0.010(系统)±0.004(τB) ps和Dₛ⁻寿命τDₛ⁻ = 0.5064±0.0030(统计)±0.0017(系统)±0.0017(τD) ps。最后的不确定性源于对B⁰和D⁻寿命的了解有限。这些结果改进了当前的测定。
