Anisotropic lattice QCD studies of penta-quarks and tetra-quarks
نویسندگان
چکیده
Anisotropic lattice QCD studies of penta-quarks(5Q) with JP = 1/2± and 3/2± are presented at the quenched level together with tetra-quarks(4Q). The standard gauge action at β = 5.75 and O(a) improved quark (clover) action with κ = 0.1410(0.010)0.1440 are employed on the anisotropic lattice with the renormalized anisotropy as/at = 4. The “hybrid boundary condition(HBC)” is adopted to discriminate a compact resonance state from scattering states. Only massive 5Q states are found for JP = 1/2+ and 3/2±, which cannot be identified as Θ+(1540). A low-lying 5Q state is found for JP = 1/2− at m5Q ≃ 1.75 GeV, which however turns out to be an NK scattering state through the HBC analysis. A preliminary result for 4Q states is presented suggesting an existence of a compact 4Q resonance at m4Q ≃ 1.1 GeV in the idealized SU(4) f chiral limit.
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