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Decoding the X(5568) as a Fully Open-Flavor sub[over ¯]d[over ¯] Tetraquark State.

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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.

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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.