Affiliation:
1. Department of Physics, Yancheng Institute of Technology, Yancheng 224000, China
2. Department of Physics, Nanjing Normal University, Nanjing 210023, China
Abstract
Motivated by the intriguing discovery of X(6900) by the LHCb collaboration, we undertake a comprehensive study of the ss¯ss¯ tetraquark system with positive parity, employing the Gaussian expansion within the chiral quark model method. We consider two structures, the diquark–antidiquark (ss-s¯s¯) structure and meson–meson (ss¯-ss¯) structure, covering all conceivable color and spin configurations. Despite the absence of bound states in our calculations, we have identified potential resonant states with JP=0+, namely, R(0,2150) and R(0,2915), as well as a resonant state with JP=1+, denoted as R(1,2950), and a resonant state with JP=2+, denoted as R(2,2850), utilizing the real-scaling method. By comparing their energies and widths, we suggest that R(0,2915) and R(1,2950) may share characteristics with X(6900), while R(0,2150) could be a promising candidate for the experimental state f0(2100). We strongly advocate for experimental investigations to shed light on the existence and properties of these resonant states.
Funder
National Natural Science Foundation of China
Funding for School-Level Research Projects of Yancheng Institute of Technology
Subject
General Physics and Astronomy
Reference33 articles.
1. Choi, S.K. et al. [Belle Collaboration] (2003). Observation of a Narrow Charmoniumlike State in Exclusive B±→K±π+π−J/ψ Decays. Phys. Rev. Lett., 91, 262001.
2. Aubert, B. et al. [BaBar Collaboration] (2005). Observation of a broad structure in the π+π−J/ψ mass spectrum around 4.26-GeV/c2/c2. Phys. Rev. Lett., 95, 142001.
3. Ablikim, M. et al. [BESIII Collaboration] (2013). Observation of a Charged Charmoniumlike Structure in e+e−→π+π−J/ψ at s =4.26 GeV/c2. Phys. Rev. Lett., 110, 252001.
4. Wang, X.L. et al. [Belle Collaboration] (2007). Observation of Two Resonant Structures in e+e- to pi+ pi- psi(2S) via Initial State Radiation at Belle. Phys. Rev. Lett., 99, 142002.
5. Understanding Y(4274) and X(4320) in the J/ψϕ invariant mass spectrum;He;Nucl. Phys. A,2013