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Decoding the X(5568) as a Fully Open-Flavor sub[over ¯]d[over ¯] Tetraquark State
Wei Chen1, Hua-Xing Chen2, Xiang Liu3,4
1Department of Physics and Engineering Physics, University of Saskatchewan, Saskatoon, Saskatchewan S7N 5E2, Canada.
Physical Review Letters
|July 23, 2016
Summary
The X(5568) meson is likely an exotic tetraquark state, specifically a bottom-strange-antidown-antiup quark combination. This finding supports its interpretation as either a scalar or axial-vector tetraquark, aligning with experimental data.
Area of Science:
- Particle Physics
- Quantum Chromodynamics (QCD)
- Hadron Spectroscopy
Background:
- The existence of exotic hadrons, such as tetraquarks, challenges conventional quark models.
- The charged X(5568) meson has been observed, prompting theoretical investigation into its nature.
- Understanding tetraquark states is crucial for a complete picture of the strong nuclear force.
Purpose of the Study:
- To investigate the nature of the charged X(5568) meson as an exotic open-flavor tetraquark state.
- To determine the spin-parity quantum numbers (J^P) of the X(5568) meson.
- To explore the possibility of a charmed partner state with similar quantum numbers.
Main Methods:
- Utilized Quantum Chromodynamics (QCD) sum rules framework for theoretical analysis.
- Employed color-antisymmetric tetraquark currents in both scalar (J^P=0^+) and axial-vector (J^P=1^+) channels.
- Performed detailed evaluations and numerical analyses of the tetraquark state properties.
Main Results:
- The X(5568) meson can be consistently interpreted as both a scalar (0^+) and an axial-vector (1^+) b[over ¯]d[over ¯] tetraquark state.
- The calculated properties align well with experimental measurements of the X(5568) meson.
- Predicted a charmed partner state (suc[over ¯]d[over ¯]) with J^P=0^+/1^+ around 2.55 GeV.
Conclusions:
- The X(5568) meson is strongly suggested to be an exotic tetraquark state with J^P=0^+ or 1^+.
- Further experimental searches for its neutral partner in radiative decays (B_s^0γ, B_s^*γ) are recommended to confirm spin-parity.
- The predicted charmed tetraquark state offers a new avenue for exploring exotic hadron spectroscopy.
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