Analysis of the Y(4500) as the vector molecular state (2212.10456v2)

Abstract: The study of hadronic parameters of mesons is of great importance for understanding the nature of strong interactions and QCD vacuum. One of the approaches to investigate these properties is the QCD Sum Rule Method (QCDSR), which has been extensively used for studying masses, decay constants, form factors, decay widths, and so on properties of both traditional and exotic hadrons. Recently BESIII collaboration discovered a new particle with a statistical significance greater than 8{\sigma} in the hidden-charm channel of the e^+ e^- annihilation, denoted as Y(4500). In this study, we investigate the Y(4500) state in the framework of the QCDSR, assuming this particle is a molecular state with quantum numbers J^PC=1^--. We examined the two-point correlation function and we take into account non-perturbative contributions in OPE side evaluating up to operator dimension 10. We calculate the mass and decay constant of the Y(4500) state and obtain a mass value consistent with the results in the literature. We hope the studies presented in this paper provide new insights to establish the hidden-charm molecular spectrum.