Status of quarkonia - like negative and positive parity states in a relativistic confinement scheme

Abstract

Properties of quarkonia - like states in the charm and bottom sector have been studied in the frame work of relativistic Dirac formalism with a linear confinement potential. We have computed the mass spectroscopy and decay properties (vector decay constant and leptonic decay width) of several quarkonia - like states. Present study is also intended to identify some of the unexplained states as mixed P-wave and mixed S-D wave states of Charmonia and Bottomonia. The results indicate that the X(4140) state can be an admixture of two P states of charmonium. And the charmonium like states X(4630) and X(4660) are the admixed state of S - D waves. Similarly, the $X(10610)$ state recently reported by Belle II can be a mixed P - states of bottomonium. In the relativistic framework we have computed vector decay constant and the leptonic decay width for S wave charmonium and bottomonium. The leptonic decay width for the $J^{PC}=1^{--}$ mixed states are also predicted. Further, both the masses and the leptonic decay width are considered for the identification of the quarkonia-like states.

arXiv comment14 pages, 2 figures

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• The $XYZ$ states: experimental and theoretical status and perspectives
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• Supersymmetry in the Double-Heavy Hadronic Spectrum
• Charmonium: Conventional and $XYZ$ States in a Relativistic Screened Potential Model
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• Masses of tetraquark states in the hidden charm sector above $D-D^{\ast }$ threshold
• Electronic width of the $\psi (3770)$ resonance interfering with the background
• Spectroscopy of heavy-heavy flavour mesons and annihilation widths of quarkonia
• Systematic analysis of the transition form factors of $B_c$ to $D$-wave charmonia and corresponding semileptonic decays
• Systematic analysis of the D-wave charmonium states with the QCD sum rules