2023/05/05 by S. S. Agaev, Agaev, S. S., K. Azizi +5
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #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.2305.03696
openalex publication_date 2023/05/05 · openalex created_date 2023/05/10 · openalex updated_date 2026/07/28
The fully charmed hadronic scalar molecules M1=ηc ηc and M2=χc0χc0 are studied in the context of the QCD sum rule method. The masses m, \widetildem and current couplings f, \widetildef of these states are calculated using the two-point sum rule approach. The obtained results m=(6264 ± 50)~MeV and \widetildem=(6954 ± 50)~MeV are employed to determine their decay channels. It is demonstrated that the processes M1→ J/ψJ/ψ and M1→ ηcηc are kinematically allowed decay modes of M1. The molecule M2 decays to J/ψJ/ψ, J/ψψ′, ηcηc, ηcηc(2S), ηcχc1(1P), and χc0 χc0 mesons. The partial widths all of these processes are evaluated by means of the three-point sum rule calculations, which are necessary to extract the strong couplings gi at vertices M1J/ψJ/ψ, M 1ηcηc, and others. Our estimates for the full widths of the molecules ΓM1=(320 ± 72)~MeV and Γ M2=(138 ± 18)~MeV, as well as their masses are compared with parameters of the X resonances discovered by the LHCb-ATLAS-CMS Collaborations in the di-J/ψ and J/ψψ′ invariant mass distributions. We argue that the molecule M1 can be considered as a real candidate to the resonance X(6200). The structure M2 may be interpreted as X(6900) or one of its components in combination with a scalar tetraquark.