Unitary coupled-channels model for three-mesons decays of heavy mesons
Unitary coupled-channels model for three-mesons decays of heavy mesons
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DOI：
10.1103/physrevd.84.114019
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发表时间：
2011-06
影响因子：
5
通讯作者：
H. Kamano;S. Nakamura;T.-S.H. Lee;T. Sato
中科院分区：
文献类型：
--
作者：
H. Kamano;S. Nakamura;T.-S.H. Lee;T. Sato
在本研究中，提出了一个单一的耦合通道模型，用于研究重介子和激发态的介子衰变为三个轻的伪标量介子。该模型考虑了衰变过程中三个介子的最终态相互作用，满足了三体和二体统一条件的要求。在缺少z图机制的情况下，这是三体统一性的必要结果，我们的衰减振幅被简化为类似于所谓等压模型分析中使用的形式。我们将耦合通道模型应用于α1（1260）、π2（1670）、π2（2100）和D0介子的三介子衰变，结果表明，在f0（600）、ρ(770)和f2（1270）占主导地位的区域，z图机制对计算的Dalitz图分布的贡献幅度高达30%。此外，通过拟合相同的Dalitz图分布，我们证明了用统一模型和等压线模型得到的衰减振幅可能有很大的不同，特别是在从B介子衰减数据中提取CKM cp违反相位的关键阶段。我们的研究结果表明，常用的等压线模型分析必须扩展到考虑三体统一性所需的最终态相互作用，以重新分析重介子的三介子衰变，从而探索混合介子或外来介子，以及标准模型之外的物理特征。«少
In this study, a unitary coupled-channels model is presented for investigating the decays of heavy mesons and excited meson states into three light pseudoscalar mesons. The model accounts for the three-mesons final state interactions in the decay processes, as required by both the three-body and two-body unitarity conditions. In the absence of the Z-diagram mechanisms that are necessary consequences of the three-body unitarity, our decay amplitudes are reduced to a form similar to those used in the so-called isobar-model analysis. We apply our coupled-channels model to the three-pions decays of α1(1260), π2(1670), π2(2100), and D0 mesons, and show that the Z-diagram mechanisms can contribute to the calculated Dalitz plot distributions by as much as 30% in magnitudes in the regions where f0(600), ρ(770), and f2(1270) dominate the distributions. Also, by fitting to the same Dalitz plot distributions, we demonstrate that the decay amplitudes obtained with the unitary model and the isobar model can be rather different, particularly in the phase that plays a crucial role in extracting the CKM CP-violating phase from the data of B meson decays. Our results indicate that the commonly used isobar model analysis must be extended to account for the final state interactions required bymore » the three-body unitarity to reanalyze the three-mesons decays of heavy mesons, thereby exploring hybrid or exotic mesons, and signatures of physics beyond the standard model.« less