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40European Organization for Nuclear Research (CERN), Geneva, Switzerland.
39Instituto Galego de Física de Altas Enerxías (IGFAE), Universidade de Santiago de Compostela, Santiago de Compostela, Spain.
Eur Phys J C Part Fields. 2018;78(6):443. doi: 10.1140/epjc/s10052-018-5758-4. Epub 2018 Jun 2.
Amplitude models are constructed to describe the resonance structure of and decays using collision data collected at centre-of-mass energies of 7 and 8 TeV with the LHCb experiment, corresponding to an integrated luminosity of 3.0 . The largest contributions to both decay amplitudes are found to come from axial resonances, with decay modes and being prominent in and , respectively. Precise measurements of the lineshape parameters and couplings of the , and resonances are made, and a quasi model-independent study of the resonance is performed. The coherence factor of the decays is calculated from the amplitude models to be , which is consistent with direct measurements. These models will be useful in future measurements of the unitary-triangle angle and studies of charm mixing and violation.
利用大型强子对撞机底夸克实验（LHCb）在质心能量为7和8 TeV时收集的碰撞数据构建振幅模型，以描述 和 衰变的共振结构，对应的积分亮度为3.0 。发现对两个衰变振幅的最大贡献来自轴矢量共振，衰变模式 和 分别在 和 中占主导。对 、 和 共振的线形参数和耦合进行了精确测量，并对 共振进行了准模型无关研究。根据振幅模型计算出衰变的相干因子为 ，这与直接测量结果一致。这些模型将有助于未来对幺正三角形角 的测量以及对粲夸克混合和 破坏的研究。
