J/Ψ at high temperatures in anisotropic lattice QCD
نویسندگان
چکیده
J/Ψ and ηc above the QCD critical temperature Tc are studied in anisotropic quenched lattice QCD, considering whether the cc̄ systems above Tc are compact quasi-bound states or scattering states. We adopt the standard Wilson gauge action and O(a)-improved Wilson quark action with renormalized anisotropy as/at = 4 at β = 6.10 on 163 × (14−26) lattices, which correspond to the spatial lattice volume V ≡ L3 ≃ (1.55fm)3 and temperatures T ≃ (1.11−2.07)Tc. To clarify whether compact charmonia survive in the deconfinement phase, we investigate spatial boundarycondition dependence of the energy of the cc̄ systems above Tc. In fact, for low-lying cc̄ scattering states, there appears a significant energy difference ∆E ≡ E(APBC)−E(PBC) between periodic and anti-periodic boundary conditions as ∆E ≃ 2 √
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