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  • 标题:J/Psi at high temperatures in anisotropic lattice QCD
  • 本地全文:下载
  • 作者:H. Iida ; N. Ishii ; T. Doi
  • 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.
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