Research Information System
PHYSICAL REVIEW D, vol.106, no.1, 2022 (SCI-Expanded)
We investigate the structure Xo4630 thorn discovered by the LHCb Collaboration in the process B thorn & RARR; J=psi phi K thorn as a resonance in the J=psi phi mass distribution. We explore this resonance as a diquark-antidiquark state X 1/4 1/2cs?1/2c over bar s over bar ? with spin-parities JPC 1/4 1- thorn . Its mass and current coupling are calculated using the QCD two-point sum rule method by taking into account vacuum condensates up to dimension 10. We also study decays of this tetraquark to mesons J=psi phi, eta c eta o0 thorn and chi c1 eta o0 thorn , and compute partial widths of these channels. To this end, we employ the light-cone sum rule approach and technical methods of soft-meson approximation to extract strong coupling at relevant tetraquark-meson-meson vertices. Our predictions for the mass m 1/4 o4632 ? 60 thorn MeV and width F 1/4 o159 ? 31 thorn MeV of X are in a very nice agreement with recent measurements of the LHCb Collaboration. These results allow us to interpret the resonance Xo4630 thorn as the tetraquark X with spin-parities JPC 1/4 1- thorn .