- 著者
- Umeda T Ohno H Kanaya K
- 出版者
- IOP Publishing Ltd
- 雑誌
- Journal of physics. G, Nuclear and particle physics (ISSN:09543899)
- 巻号頁・発行日
- vol.35, no.10, pp.104157, 2008-10
- 被引用文献数
- 1 1
Dissociation temperatures of J/ψ, ψ' and χc states play key roles in the sequential J/ψ suppression scenario for high-energy heavy-ion collisions. We report on a study of charmonium dissociation temperatures in quenched lattice QCD. On anisotropic lattices, we first subtract the effects of the constant mode in finite temperature meson correlators, which have led to unphysical results in previous studies. We then extract ground and first exited state masses by diagonalizing correlation functions among different source and sink operators. To distinguish bound states from scattering states, we first compare the charmonium mass spectra under different spatial boundary conditions, and examine the shape and the volume dependence of their Bethe–Salpeter wavefunctions. From these studies, we found, so far, no sign of scattering states up to about 2.3Tc.
- 著者
- Ohno H Umeda T Kanaya K WHOT-QCD Collaboration
- 出版者
- IOP Publishing Ltd
- 雑誌
- Journal of physics. G, Nuclear and particle physics (ISSN:09543899)
- 巻号頁・発行日
- vol.36, no.6, pp.064027, 2009
- 被引用文献数
- 4
Dissociation of charmonia in hot QCD is studied on a quenched anisotropic lattice using standard plaquette gauge action and O(a) improved Wilson fermion action. Simulations are carried out at temperatures in the range 0.88 TC to 2.3 TC. We calculate effective masses and Bethe–Salpeter wavefunctions for the ground state (1S, 1P) and some excited states (2S, 2P) with variational analysis. To distinguish between bound states and scattering states, we apply two methods: first, we compare effective masses for charmonium correlation functions under different spatial boundary conditions. Because the scattering states are sensitive to the boundary conditions, finite volume effects are expected when a charmonium dissociates. Second, we study if the wavefunctions show a sign of scattering states which will be characterized by a broad wavefunction. We find no clear evidence of dissociation for the charmonium states up to 2.3 TC so far.