New insight into the exotic states strongly coupled with the DD‾∗ from the Tcc

Guang-Juan Wang; Zhi Yang; Jia-Jun Wu; Makoto Oka; Shi-Lin Zhu

doi:10.1016/j.scib.2024.07.012

New insight into the exotic states strongly coupled with the DD‾^∗ from the T_cc

Sci Bull (Beijing). 2024 Oct 15;69(19):3036-3041. doi: 10.1016/j.scib.2024.07.012. Epub 2024 Jul 24.

Authors

Guang-Juan Wang¹, Zhi Yang², Jia-Jun Wu³, Makoto Oka⁴, Shi-Lin Zhu⁵

Affiliations

¹ KEK Theory Center, Institute of Particle and Nuclear Studies (IPNS), High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801, Japan.
² School of Physics, University of Electronic Science and Technology of China, Chengdu 610054, China. Electronic address: [email protected].
³ School of Physical Sciences, University of Chinese Academy of Sciences (UCAS), Beijing 100049, China; Southern Center for Nuclear-Science Theory (SCNT), Institute of Modern Physics, Chinese Academy of Sciences, Huizhou 516000, China. Electronic address: [email protected].
⁴ Advanced Science Research Center, Japan Atomic Energy Agency, Tokai 319-1195, Japan; Nishina Center for Accelerator-Based Science, RIKEN, Wako 351-0198, Japan.
⁵ School of Physics and Center of High Energy Physics, Peking University, Beijing 100871, China.

PMID: 39142944
DOI: 10.1016/j.scib.2024.07.012

Abstract

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_cc⁺ state and extract the DD^∗ interaction, from which the T_cc⁺ 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^PC=1^+- sector, we have found two states related to the iso-scalar X̃(3872) and h_c(2P), respectively. Our combined study provides valuable insights into the nature of these DD^∗/DD¯^∗ exotic states.

Keywords: Charmonium(-like) states; Coupled-channel effect; Exotic hadrons; Quark model.