2025/08/03 by H. Gao, Zu-Xin Cai, Gao, Hong-Shuo +5
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #Nuclear physics research studies #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions
paper · pdf · doi:10.48550/arxiv.2508.01536
openalex publication_date 2025/08/03 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
The X(3872) is theoretically predicted to have a spin-0 partner state denoted as X0. Assuming the X0 as a DD molecular bound state, we calculate the decay widths of X0→ VV and X0 → PP (V and P stand for light vector and pseudoscalar mesons, respectively) via intermediate charmed meson loops. Three different configurations of the X0, i.e., pure neutral components (θ= 0), isospin singlet (θ= π/4) and pure charged components (θ= π/2), are investigated. Within a commonly accepted range of the model parameter α, the predicted decay widths of X0 → VV are on the order of a few hundred keV, while the decay widths of X0 → PP can reach several MeV. The X0 → ρρ and ππ have larger decay rates. The relative width ratios between the channels are nearly model-independent. Moreover, among those channels only with isovector or isoscalar mesons, the relevant ratios are also independent of the phase angle. The predicted ratios are helpful for searching the X0 in the future experiments at BESIII and Belle II.