Direct Evidence for the $\bar{D}D^*/D\bar{D}^*$ Molecular Nature of $G(3900)$ Through Triangular Singularity Mechanisms

Yin Huang; Xurong Chen

Direct Evidence for the $\bar{D}D^/D\bar{D}^$ Molecular Nature of $G(3900)$ Through Triangular Singularity Mechanisms

High Energy Physics - Phenomenology 2025-01-22 v1 High Energy Physics - Experiment Nuclear Theory

Authors: Yin Huang , Xurong Chen

Abstract

The exotic hadron $G(3900)$ , initially observed in the process $e^+ e^- \to D\bar{D}$ , has been further supported by analyses from the BESIII Collaboration, which classify it as a $P$ -wave molecular state of $D^{+}D^{*-}/D^{-}D^{*+}$ . However, theoretical discussions raise concerns about its status as a true particle, emphasizing the need for additional studies. In this Letter, we employ the triangular singularity mechanism to investigate $G(3900)$ across various reaction channels, allowing us to produce significant peaks without relying on the existence of a real particle. We identify $X(4020)$ , $Y(4320)$ , and the tentative $X(4014)$ as potential sources of these peaks via decay processes to $\gamma G(3900)$ or $\pi G(3900)$ . We stress the importance of experimental explorations of $e^+ e^- \to X/Y \to \gamma(\pi) G(3900)$ , which are essential for confirming the molecular composition of $D^{+}D^{*-}/D^{-}D^{*+}$ and refining the mass measurement of $G(3900)$ .

Keywords

exotic hadron $G(3900)$ triangular singularity molecular state $D^{+}D^{*-}/D^{-}D^{*+}$

Cite

@article{arxiv.2501.10992,
  title  = {Direct Evidence for the $\bar{D}D^*/D\bar{D}^*$ Molecular Nature of $G(3900)$ Through Triangular Singularity Mechanisms},
  author = {Yin Huang and Xurong Chen},
  journal= {arXiv preprint arXiv:2501.10992},
  year   = {2025}
}

Comments

5 papers, 3 figures