Wang Guang-Juan, Yang Zhi, Wu Jia-Jun, Oka Makoto, Zhu Shi-Lin
KEK Theory Center, Institute of Particle and Nuclear Studies (IPNS), High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801, Japan.
School of Physics, University of Electronic Science and Technology of China, Chengdu 610054, China.
Sci Bull (Beijing). 2024 Oct 15;69(19):3036-3041. doi: 10.1016/j.scib.2024.07.012. Epub 2024 Jul 24.
We have investigated the internal structure of the open- and hidden-charmed (DD/D¯D) molecules in the unified framework. We first fit the experimental lineshape of the T state and extract the DD interaction, from which the T is assumed to arise solely. Then we obtain the DD¯ interaction by charge conjugation. Our results show that the DD¯ interaction is attractive but insufficient to form X(3872) as a bound state. Instead, its formation requires the crucial involvement of the coupled channel effect between the DD¯ and cc¯ components, although the cc¯ accounts for approximately 1% only. Besides X(3872), we have obtained a higher-energy state around 3957.9 MeV with a width of 16.7 MeV, which may be a potential candidate for the X(3940). In J=1 sector, we have found two states related to the iso-scalar X̃(3872) and h(2P), respectively. Our combined study provides valuable insights into the nature of these DD/DD¯ exotic states.
我们在统一框架下研究了开放粲和隐藏粲（DD/D¯D）分子的内部结构。我们首先拟合T态的实验线形并提取DD相互作用，假设T态仅由此产生。然后通过电荷共轭得到DD¯相互作用。我们的结果表明，DD¯相互作用具有吸引力，但不足以形成作为束缚态的X(3872)。相反，尽管cc¯仅占约1%，但其形成需要DD¯和cc¯分量之间耦合道效应的关键参与。除了X(3872)，我们还得到了一个能量约为3957.9 MeV、宽度为16.7 MeV的更高能态，它可能是X(3940)的一个潜在候选态。在J = 1扇区，我们分别发现了与同位旋标量X̃(3872)和h(2P)相关的两个态。我们的综合研究为这些DD/DD¯奇特态的性质提供了有价值的见解。
