2024/04/25 by Jun-Zhang Wang, Wang, Jun-Zhang, Zi-Yang Lin +7 · 1 citation
Physics and Astronomy · #Black Holes and Theoretical Physics #Cosmology and Gravitation Theories #FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #High Energy Physics - Lattice (hep-lat) #High Energy Physics - Phenomenology (hep-ph) #Quantum Chromodynamics and Particle Interactions
paper · pdf · doi:10.48550/arxiv.2404.16575
openalex publication_date 2024/04/25 · openalex created_date 2024/04/27 · openalex updated_date 2026/07/28
The X(3872), as the first and the most crucial member in the exotic charmoniumlike XYZ family, has been studied for a long time. However, its dynamical origin, whether stemming from a DD^* hadronic molecule or the first excited P-wave charmonium χc1(2P), remains controversial. In this Letter, we demonstrate that the X(3872) definitely does not result from the mass shift of the higher bare χc1(2P) resonance pole in the coupled-channel dynamics involving a short-distance cc core and the long-distance DD^* channels. Instead, it originates from either the DD^* molecular pole or the shadow pole associated with the anti-resonance of the P-wave charmonium, depending on the weak or strong coupling mode, respectively. To differentiate these origins and fully exploit the nature of X(3872), we conduct a comprehensive analysis in a couple-channel dynamics framework, including the isospin violation, the three-body DDπ effect, the dynamical width of D^*, and non-open-charm decays of the bare χc1(2P). Our findings highlight the pivotal role of the coupled-channel dynamics in explaining the disparity between the pole widths of X(3872) and Tcc+, while also predicting a new resonance with JPC=1++ around 4.0 GeV. By matching the newly observed χc1(4010) by the LHCb Collaboration to our predicted resonance, we conclude that the X(3872) most likely originates from the DD^* pole with a confidence level exceeding 99.7%.