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28Nikhef National Institute for Subatomic Physics, Amsterdam, The Netherlands.
45Physik-Institut, Universität Zürich, Zürich, Switzerland.
Eur Phys J C Part Fields. 2018;78(12):1019. doi: 10.1140/epjc/s10052-018-6447-z. Epub 2018 Dec 17.
A Dalitz plot analysis of decays is performed using data samples of collisions collected with the detector at centre-of-mass energies of and , corresponding to a total integrated luminosity of . A satisfactory description of the data is obtained when including a contribution representing an exotic resonant state. The significance of this exotic resonance is more than three standard deviations, while its mass and width are and , respectively. The spin-parity assignments and are both consistent with the data. In addition, the first measurement of the branching fraction is performed and gives where the first uncertainty is statistical, the second systematic, and the third is due to limited knowledge of external branching fractions.
利用在质心能量为 和 时，由 探测器收集的 碰撞数据样本，对 衰变进行了Dalitz图分析，对应的总积分亮度为 。当包含一个代表奇异 共振态的贡献时，可得到对数据的满意描述。这种奇异共振的显著性超过三个标准差，而其质量和宽度分别为 和 。自旋宇称赋值 和 均与数据一致。此外，还首次测量了 分支比，结果为 ，其中第一个不确定度是统计性的，第二个是系统性的，第三个是由于对外部分支比的了解有限。
