论文标题
三角奇异点和类似charmonium $ xyz $ state
Triangle Singularities and Charmonium-like $XYZ$ States
论文作者
论文摘要
哈德子的光谱对于理解量子染色体动力学的限制很重要。自2003年以来，由于$ xyz $结构的丰富性发现，重量Quarkonium Mass地区的$ XYZ $结构是出色的例子，因此出现了许多新的难题。 HADRONIC共振对应于$ S $ -MATRIX的两极，由于三个中间粒子的同时壳，具有其他类型的奇异性，例如三角奇异性。在这里，我们简要讨论了$ xyz $物理学中三角奇异性的一些可能的表现，特别关注形式主义，可用于分析反应$ e^+e^+e^+e^ - \ toψπ^+π^+π的$ψπ$分布中充电的$ z_c $结构的数据。
The spectrum of hadrons is important for understanding the confinement of quantum chromodynamics. Many new puzzles arose since 2003 due to the abundance of experimental discoveries with the $XYZ$ structures in the heavy quarkonium mass region being the outstanding examples. Hadronic resonances correspond to poles of the $S$-matrix, which has other types of singularities such as the triangle singularity due to the simultaneous on-shellness of three intermediate particles. Here we briefly discuss a few possible manifestations of triangle singularities in the $XYZ$ physics, paying particular attention to the formalism that can be used to analyze the data for charged $Z_c$ structures in the $ψπ$ distributions of the reaction $e^+e^-\to ψπ^+π^-$.
