πT_cc系统中由π介子驱动的近阈增强现象
A pion-driven near-threshold enhancement in the $π\,T_{cc}$ system
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中文总结 AI 辅助
本研究通过Faddeev方程的固定中心近似分析π与T^+_{cc}(3875)的散射，发现πT_{cc}系统在约4055 MeV处有类共振增强，提出可在T_{cc}π不变质量分布中探寻该增强。
中文摘要 AI 辅助
强子分子通常被视为近阈两体动力学的产物。本研究通过对π介子与T^+_{cc}(3875)的散射过程进行分析，探究实验上已确认的分子是否可作为构建更复杂奇特强子的基本单元。将T_{cc}视为关联的同位标量D D^*分子团簇，我们在Faddeev方程的固定中心近似框架下，描述了I(J^P)=1(1^-)道中产生的π D D^*动力学。完整的三体振幅在πT_{cc}阈上方略高处形成显著增强，峰值质量M_{peak}约为4055 MeV，表观宽度约为60 MeV。该振幅实部与虚部的相关行为符合类共振解释。这些结果表明，最轻的强子可在将观测到的强子分子转化为三体动力学产生的较重近阈结构的基本单元方面发挥主动动力学作用。我们建议在T_{cc}π不变质量分布中寻找此增强，尤其通过D^0D^0π^+π^-末态进行。
英文摘要
Hadronic molecules are commonly viewed as products of near-threshold two-body dynamics. We investigate whether an experimentally established molecule can also serve as a building block for a more complex exotic hadron by studying pion scattering off $T^+_{cc}(3875)$. Treating $T_{cc}$ as a correlated isoscalar $D D^*$ molecular cluster, we describe the resulting $πD D^*$ dynamics in the $I(J^P)=1(1^-)$ channel within the Fixed Center Approximation to the Faddeev equations. The full three-body amplitude develops a pronounced enhancement slightly above the $πT_{cc}$ threshold, centered at $M_{\rm peak}\simeq 4055$~MeV, with an apparent width of approximately $60$~MeV. The associated behavior of the real and imaginary parts of the amplitude is compatible with a resonant-like interpretation. These results show that the lightest hadron can play an active dynamical role in promoting an observed hadronic molecule into a building block of a heavier near-threshold structure generated by the three-body dynamics. We propose searching for this enhancement in the $T_{cc}π$ invariant-mass distribution, particularly through the $D^0D^0π^+π^-$ final state.
