Reconciling experimental and lattice data of Z_c(3900) in a J/ψπ-DD^* coupled-channel analysis

2023/07/23 by Lin-Wan Yan, Zhi-Hui Guo, Yan, Lin-Wan +7
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Lattice (hep-lat) #High Energy Physics - Phenomenology (hep-ph) #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions

paper · pdf · doi:10.48550/arxiv.2307.12283

openalex publication_date 2023/07/23 · openalex created_date 2023/07/26 · openalex updated_date 2026/08/01

Abstract

We study the J/ψπ and DD^* coupled-channel system within a covariant framework. The J/ψπ and DD^* invariant-mass distributions measured at 4.23~GeV and 4.26~GeV by BESIII and the finite-volume energy levels from recent lattice QCD simulations are simultaneously fitted. Phase shifts and inelasticities of the J/ψπ and DD^* scattering are predicted using the resulting amplitudes. Poles corresponding to the Z_c(3900) state are found in the complex energy plane and their couplings with J/ψπ and DD^* are determined. Our results indicate that the current lattice data do not preclude the existence of a physical Z_c(3900) state.

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