2024/12/09 by Zhongyu Wang, Yu-Shuai Li, Wang, Zhong-Yu +3
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #Scientific Research and Discoveries
paper · pdf · doi:10.48550/arxiv.2412.06446
openalex publication_date 2024/12/09 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
Inspired by the newly observed T_cs state in the Ds1(2460)+ → Ds+π+π- reaction by the LHCb Collaboration, we investigate the amplitude of this decay to explore the origins and properties of the open-charm tetraquark state based on the final state interaction. The invariant mass distributions of Ds+π+ and π+π- are well reproduced by the S-wave scattering amplitudes of the coupled channel systems Dsπ and ππ. However, neither the tree-level nor both the tree-level and ππ coupled channel scattering contributions can describe the experimental data well, which indicates that the Dsπ coupled channel scattering is required. We find that the T_cs and f0(500) resonances are dynamically generated from the pseudoscalar-pseudoscalar meson interaction within the chiral unitary approach. In addition, we find the corresponding poles and also calculate the S-wave scattering length for the DK channel, which is on the same scale as the result extracted from the experiment. We propose that the T_cs and f0(500) resonances in the Ds1(2460)+ → Ds+π+π- reaction are hadronic molecular type particles.