Charmonium spectral functions at finite momenta in the quark-gluon plasma from lattice QCD

May 24, 2011, 4:20 PM
20m
Salon Ravel AB (Imperial Palace)

Salon Ravel AB

Imperial Palace

Parallel Heavy flavor and quarkonia production Heavy flavors

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)

Presentation materials