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标题：J/Psi at high temperatures in anisotropic lattice QCD
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作者：H. Iida ; N. Ishii ; T. Doi 等
期刊名称：PoS - Proceedings of Science
印刷版ISSN：1824-8039
出版年度：2005
卷号：2005
出版社：SISSA, Scuola Internazionale Superiore di Studi Avanzati
摘要：J/Y and hc above the QCD critical temperature Tc are studied in anisotropic quenched lattice QCD, considering whether the c ¯ c 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 b = 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 c ¯ c systems above Tc. In fact, for low-lying c ¯ c scattering states, there appears a significant energy difference DE ´ E(APBC)−E(PBC) between periodic and anti-periodic boundary conditions as DE ' 2 p m2c +3p2/L2 −2mc (mc: charm quark mass) on the finite-volume lattice. In contrast, for compact charmonia, there is no significant energy difference between periodic and anti-periodic boundary conditions. As a lattice QCD result, we find almost no spatial boundary-condition dependence for the energy of the c ¯ c system in J/Y and hc channels for T ' (1.11−2.07)Tc, which indicates that J/Y and hc would survive as compact c ¯ c quasi-bound states below 2Tc.