Abstract
Spectroscopic parameters and decay channels of the vector resonance are studied by considering it as a diquark-antidiquark state with the quark content . The mass and coupling of the tetraquark are calculated using the QCD two-point sum rules by taking into account various quark, gluon and mixed condensates up to dimension 15. Partial widths of its strong decays to , , and are computed as well. To this end, we explore the vertices , , and , and calculate the corresponding strong couplings by means of the QCD light-cone sum rule method. The coupling of the vertex is found using the full version of this method, and by treating the scalar meson as a diquark-antidiquark tetraquark state. The couplings and , however, are calculated by applying the soft-meson approximation to the light-cone sum rule method. Prediction for the mass of the resonance is in excellent agreement with the data of the BABAR Collaboration [Phys. Rev. D 74, 091103 (2006)], and within errors of calculations is compatible with the result reported by BESIII [Phys. Rev. D 91, 052017 (2015)]. The full width of the saturated by its three strong decay channels is in a reasonable agreement with existing experimental data.
- Received 22 November 2019
- Accepted 30 March 2020
DOI:https://doi.org/10.1103/PhysRevD.101.074012
Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3.
Published by the American Physical Society