2025/12/02 by Mao-Jun Yan, Yan, Mao-Jun, Chun-Sheng An +3
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.2512.02655
openalex publication_date 2025/12/02 · openalex created_date 2025/12/04 · openalex updated_date 2026/07/28
We assess possible axial-vector states with G-parity (G=± 1) dynamically generated by pseudoscalar-vector interactions in coupled channels, driven by the Weinberg-Tomozawa term at leading order in chiral perturbation theory. The S-wave amplitudes are unitarized via the Bethe-Salpeter equation, and poles of the unitarized amplitudes are searched for in the complex energy plane. In the isovector sector with IG(JPC)=1±(1+∓), we identify two poles around 1400 MeV in the second Riemann sheet below the K^*K mass threshold. The G=+1 and G=-1 poles can be one of the origins of the peaks in the f0(980)π and ϕπ0 mass spectra reported by the COMPASS and BESIII collaborations, respectively, in the πN → πππN and J/ψ→ ηϕπ processes, in addition to triangle singularity effects discussed in the literature. Additionally, the poles in the isoscalar sector may explain the nontrivial behavior of the K^*K spectra line shapes measured by several experiments in different reactions. Specifically, for the 0+(1++) case, we find a sizeable K^*K component for the f1(1420). In the 0-(1+-) scenario, the pole strongly coupled to ρπ can be associated with the h1(1170) resonance. Lastly, in this same sector, we identify a higher pole that dominates the K^*K invariant mass in the χcJ → ϕK^*K decay, where the \(h1(1415)\) is observed in the BESIII data.