We interpret the X1(2900) as an S-wave Dˉ1K molecular state in the Bethe-Salpeter equation approach with the ladder and instantaneous approximations for the kernel. By solving the Bethe-Salpeter equation numerically with the kernel containing one-particle-exchange diagrams and introducing three different form factors (monopole, dipole, and exponential form factors) in the verties, we find the bound state exists. We also study the decay width of the decay X1(2900) to D−K+.
@article{arxiv.2101.06688,
title = {Studying the $\bar{D}_1K$ molecule in the Bethe-Salpeter equation approach},
author = {Jing-Juan Qi and Zhen-Yang Wang and Zhu-Feng Zhang and Xin-Heng Guo},
journal= {arXiv preprint arXiv:2101.06688},
year = {2021}
}
Comments
13 pages, 4 figures. arXiv admin note: text overlap with arXiv:2004.14085, arXiv:1906.09002