Resonance X(7300): excited 2S tetraquark or hadronic molecule χ_{c 1}χ_{c 1} ?
Abstract
We explore the first radial excitation X_{4c}^{∗} of the fully charmed diquarkantidiquark state X_{4c}=c c c ¯c ¯ built of axialvector components, and the hadronic molecule M =χ_{c 1}χ_{c 1} . The masses and current couplings of these scalar states are calculated in the context of the QCD twopoint sum rule approach. The full widths of X_{4c}^{∗} and M are evaluated by taking into account their kinematically allowed decay channels. We find partial widths of these processes using the strong couplings g_{i}^{∗} and G_{i}^{(∗)} at the X_{4c}^{∗}(M )conventional mesons vertices computed by means of the QCD threepoint sum rule method. The predictions obtained for the parameters m =(7235 ±75 )MeV , Γ =(144 ±18 )MeV and m ~=(7180 ±120 ) MeV , Γ ~=(169 ±21 ) MeV of these structures, are compared with the experimental data of the CMS and ATLAS Collaborations. In accordance to these results, within existing errors of measurements and uncertainties of the theoretical calculations, both the excited tetraquark and hadronic molecule may be considered as candidates to the resonance X(7300). Detailed analysis, however, demonstrates that the preferable model for X(7300) is an admixture of the molecule M and sizeable part of X_{4c}^{∗}.
 Publication:

European Physical Journal C
 Pub Date:
 November 2023
 DOI:
 10.1140/epjc/s1005202312145y
 arXiv:
 arXiv:2307.01857
 Bibcode:
 2023EPJC...83..994A
 Keywords:

 High Energy Physics  Phenomenology;
 High Energy Physics  Experiment;
 High Energy Physics  Lattice
 EPrint:
 12 Pages, 4 Figures and 1 Table