Speaker
Prof.
Chiho Nonaka
(Nagoya University)
Description
From phenomenological considerations, J/psi suppression was proposed
as a signature of QGP production in relativistic heavy ion collisions,
and has been considered as one of the most promising ones [1].
However recent lattice QCD calculations show that charmonia survive even above the
critical temperature [2], which presents the possibility that the scenario of J/psi
suppression in relativistic heavy ion collisions may change.
To understand the relativistic heavy ion collision physics we need to take into account
dynamics of the fireball which is produced after collisions. Therefore the detailed study
on spectral functions of charmonia at finite momenta from the first principle
calculation would shed light on the understanding of the J/psi suppression mechanism
in relativistic heavy ion collisions.
We study the charmonium spectral functions at finite momenta in the quark-gluon
plasma on 64^3 × N_t(=96(T/Tc=0.78),54(1.38),46(1.62),40(1.87),32(2.33))
quenched anisotropic lattices with anisotropy a_s /a_t= 4, analyzing correlation
functions of charmonia by the maximum entropy method (MEM) which is a
very useful and powerful tool to analyze spectral functions from lattice QCD simulations [3].
We show detailed features of charmonium spectral functions of pseudoscalar and
vector channels and modification of the dispersion relation
at finite momenta and discuss medium effect on them in QGP.
[1] T. Matsui and H. Satz, Phys. Lett. B 178 (1986) 416,
T. Hashimoto, K. Hirose, T. Kanki and O. Miyamura, Phys. Rev. Lett. 57 (1986) 2123.
[2] M. Asakawa and T. Hatsuda, Phys. Rev. Lett. 92 (2004) 012001,
S. Datta, F. Karsch, P. Petreczky and I. Wetzorke, Phys. Rev. D 69 (2004) 094507,
H. Iida, T. Doi, N. Ishii, H. Suganuma and K. Tsumura, Phys. Rev. D 74 (2006) 074502,
T. Umeda, Phys. Rev. D 75 (2007) 094502.
[3] M. Asakawa, T. Hatsuda and Y. Nakahara, Prog. Part. Nucl. Phys. 46 (2001) 459.
Primary author
Prof.
Chiho Nonaka
(Nagoya University)
Co-authors
Prof.
Masakiyo Kitazawa
(Osaka University)
Prof.
Masayuki Asakawa
(Osaka University)
Mr
Yasuhiro Kohno
(Osaka University)
