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Nikhef National Institute for Subatomic Physics, Amsterdam, Netherlands.
Department of Physics, University of Warwick, Coventry, United Kingdom.
Phys Rev Lett. 2023 Jul 28;131(4):041902. doi: 10.1103/PhysRevLett.131.041902.
A combined amplitude analysis is performed for the decays B^{0}→D[over ¯]^{0}D_{s}^{+}π^{-} and B^{+}→D^{-}D_{s}^{+}π^{+}, which are related by isospin symmetry. The analysis is based on data collected by the LHCb detector in proton-proton collisions at center-of-mass energies of 7, 8, and 13 TeV. The full data sample corresponds to an integrated luminosity of 9 fb^{-1}. Two new resonant states with masses of 2.908±0.011±0.020 GeV and widths of 0.136±0.023±0.013 GeV are observed, which decay to D_{s}^{+}π^{+} and D_{s}^{+}π^{-} respectively. The former state indicates the first observation of a doubly charged open-charm tetraquark state with minimal quark content [cs[over ¯]ud[over ¯]], and the latter state is a neutral tetraquark composed of [cs[over ¯]u[over ¯]d] quarks. Both states are found to have spin-parity of 0^{+}, and their resonant parameters are consistent with each other, which suggests that they belong to an isospin triplet.
对衰变(B^{0}\to\overline{D}^{0}D_{s}^{+}\pi^{-})和(B^{+}\to D^{-}D_{s}^{+}\pi^{+})进行了联合幅度分析，这两个衰变通过同位旋对称性相关联。该分析基于大型强子对撞机底夸克探测器（LHCb探测器）在质心能量为7、8和13 TeV的质子 - 质子碰撞中收集的数据。完整的数据样本对应于9 fb⁻¹的积分亮度。观察到两个新的共振态，其质量为(2.908\pm0.011\pm0.020) GeV，宽度为(0.136\pm0.023\pm0.013) GeV，分别衰变为(D_{s}^{+}\pi^{+})和(D_{s}^{+}\pi^{-})。前一个态表明首次观测到具有最小夸克含量([cs\overline{u}d\overline{u}])的双电荷开粲四夸克态，后一个态是由([cs\overline{u}\overline{d}])夸克组成的中性四夸克态。发现这两个态的自旋宇称均为(0^{+})，并且它们的共振参数相互一致，这表明它们属于一个同位旋三重态。
