在\(B^{0}\to D^{-}D^{+}K^{+}\pi^{-}\)衰变中对一个新的激发态\(D_{s}^{+}\)介子的观测。

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Nikhef National Institute for Subatomic Physics, Amsterdam, Netherlands.

Physik-Institut, Universität Zürich, Zürich, Switzerland.

Phys Rev Lett. 2021 Mar 26;126(12):122002. doi: 10.1103/PhysRevLett.126.122002.

Using pp collision data corresponding to an integrated luminosity of 5.4 fb^{-1} collected with the LHCb detector at a center-of-mass energy of 13 TeV, the B^{0}→D^{-}D^{+}K^{+}π^{-} decay is studied. A new excited D_{s}^{+} meson is observed decaying into the D^{+}K^{+}π^{-} final state with large statistical significance. The pole mass and width, and the spin parity of the new state are measured with an amplitude analysis to be m_{R}=2591±6±7 MeV, Γ_{R}=89±16±12 MeV, and J^{P}=0^{-}, where the first uncertainty is statistical and the second systematic. Fit fractions for all components in the amplitude analysis are also reported. The new resonance, denoted as D_{s0}(2590)^{+}, is a strong candidate to be the D_{s}(2^{1}S_{0})^{+} state, the radial excitation of the pseudoscalar ground-state D_{s}^{+} meson.

利用在大型强子对撞机底夸克探测器（LHCb）上，在质心能量为13 TeV时收集的、对应于积分亮度为5.4 fb⁻¹的质子-质子碰撞数据，对B⁰→D⁻D⁺K⁺π⁻衰变进行了研究。观测到一个新的激发态Dₛ⁺介子衰变为具有很大统计显著性的D⁺K⁺π⁻末态。通过幅度分析测量了新态的极点质量、宽度以及自旋宇称，结果为mₚ = 2591±6±7 MeV，Γₚ = 89±16±12 MeV，Jᴾ = 0⁻，其中第一个不确定度是统计不确定度，第二个是系统不确定度。还报告了幅度分析中所有分量的拟合分数。这个新的共振态，记为Dₛ₀(2590)⁺，很有可能是Dₛ(2¹S₀)⁺态，即赝标量基态Dₛ⁺介子的径向激发态。